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1316199ee120da998cb6c0795d05652b3b4cc018
subsection
198
1,121
Global power monoids
For every n-tuple G_1,\dots , G_n of compact Lie groups the functor\operatorname{Ho}(umon)\ \longrightarrow \ \text{(sets)}\ ,\quad X \ \longmapsto \ \pi _0^{G_1}(X)\times \dots \times \pi _0^{G_n}(X)is represented by the free ultra-commutative monoid {\mathbb {P}}(B_{\operatorname{gl}} G_1 \amalg \ldots \amalg B_{\ope...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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cd9c24443ebbe1fa2ca543bf04eb4fe53342634a
subsection
199
1,121
Global power monoids
Because{\mathbb {P}}(B_{\operatorname{gl}} G_1 \amalg \ldots \amalg B_{\operatorname{gl}} G_n)\ &\cong \ {\mathbb {P}}(B_{\operatorname{gl}} G_1)\boxtimes \dots \boxtimes {\mathbb {P}}( B_{\operatorname{gl}} G_n)\\ &\cong \ {\coprod }_{j_1,\dots ,j_n\ge 0}\, B_{\operatorname{gl}} (\Sigma _{j_1}\wr G_1)\boxtimes \dots \...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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6342ecdaef3cda8a1449914c7e71937db90a11a9
subsection
200
1,121
Global power monoids
We define an isomorphic algebraic category \mathbb {A}^+, the effective Burnside category.effective Burnside category Both \operatorname{Nat}^{umon}and \mathbb {A}^+ are `pre-preadditive' in the sense that all morphism sets are abelian monoids and composition is biadditive. In \operatorname{Nat}^{umon}, the monoid stru...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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eb57652ce897a09b3810145d8a5d64e1cbffbfb3
subsection
201
1,121
Global power monoids
The map(\lbrace 1,\dots ,k\rbrace \times G) \ \amalg \ (\lbrace 1,\dots ,m\rbrace \times G) \ \longrightarrow \ \Phi _{k,m}^*(\lbrace 1,\dots ,k+m\rbrace \times G)that is the inclusion on the first summand and given by (j,g)\mapsto (k+j,g) on the second summand is an isomorphism of ((\Sigma _k\wr G)\times (\Sigma _m\wr...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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64d1375f483a42454af117140ac0eb7312d5a370
subsection
202
1,121
Global power monoids
Since the isomorphism class of _G G_G is the identity of G in \mathbb {A}^+, the construction B preserves identities.For the compatibility of B with composition we consider another operation \beta ^*\circ [k]\in \operatorname{Nat}^{umon}(K,M) and observe that(\beta ^*\circ [k])\circ (\alpha ^*\circ [m])\ = \ (\Psi _{k,...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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8c4a7bca4dfb26ed877a283b5988818dd6a33261
subsection
203
1,121
Global power monoids
Moreover, a K-G-isomorphism\alpha ^*(\lbrace 1,\dots ,m\rbrace \times G)_G\ \cong \ \beta ^*(\lbrace 1,\dots ,m\rbrace \times G)_Gis given by the action of a unique element \omega \in \Sigma _m\wr G, and then the homomorphisms \alpha ,\beta :K\longrightarrow \Sigma _m\wr G are conjugate by \omega . So the functor B is ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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4f693d5552407a270d24a330c192e1457628fc33
subsection
204
1,121
Global power monoids
Since inner automorphisms induce the identity in any Rep-functor, we conclude that\Psi _{\bar{g}}^* = \Psi _{\bar{g}\omega }^* \ : \ M(\Sigma _m\wr H) \ \longrightarrow \ M(G)\ .So the transfer \operatorname{tr}_H^G does not depend on the choice of basis \bar{g}.The various properties of the power operations imply cert...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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5aecb8ea2e51466a5207c38ee3598534c2d5cc6d
subsection
205
1,121
Global power monoids
Then\bar{f}\bar{g}\ = \ (f_1 g_1,\dots ,f_1 g_m,\ f_2 g_1,\dots , f_2 g_m, \ \dots ,\ f_k g_1,\dots ,f_k g_m)is an H-basis of F. With respect to this basis, the homomorphism \Psi _{\bar{f}\bar{g}}:F\longrightarrow \Sigma _{k m}\wr H equals the compositeF\ \xrightarrow{} \Sigma _k\wr G \ \xrightarrow{} \ \Sigma _k\wr (\...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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2b77edfed90c8576271f86548e990fda2369b381
subsection
206
1,121
Global power monoids
Then s_1+\dots +s_r=m=[G:H] is the index of H in G, and this data provides an H-basis of G, namely\bar{g} \ = \ (k^1_1 g_1,\,\dots ,k^1_{s_i}g_1,\, k^2_1 g_2,\,\dots ,k^2_{s_2}g_2,\,\dots , k^r_1 g_r,\,\dots ,k^r_{s_r}g_r)\ .The following diagram of group homomorphisms then commutes:@C=10mm{ K [r]^-{\text{incl}} [d]_{(...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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37818c7c13ba4c2592f8b8ba6dce7068a0a3b116
subsection
207
1,121
Global power monoids
From here the double coset formula is straightforward:\operatorname{res}^G_K\circ \operatorname{tr}_H^G \ &= \ \operatorname{res}^G_K\circ \Psi _{\bar{g}}^*\circ [m] \\ &= \ ((\Sigma _{s_1}\wr c_{g_1})\circ \Psi _{\bar{k}^1},\dots ,(\Sigma _{s_r}\wr c_{g_r})\circ \Psi _{\bar{k}^r})^*\circ \Phi _{s_1,\dots ,s_r}^*\circ ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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8c16f64363a86bf2cf219557308fb3a6b86befc0
subsection
208
1,121
Global power monoids
With respect to these bases we have\Psi _{\alpha (\bar{k})}\circ \alpha \ = \ (\Sigma _m\wr (\alpha |_L)) \circ \Psi _{\bar{k}} \ : \ K \ \longrightarrow \ \Sigma _m\wr H \ .So\alpha ^*\circ \operatorname{tr}_H^G \ = \ \alpha ^*\circ \Psi ^*_{\alpha (\bar{k})} \circ [m] \ &= \ \Psi _{\bar{k}}^*\circ (\Sigma _m\wr (\alp...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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54e9b03eaa6198c59fd302a9ac99b5e3e27a02d9
subsection
209
1,121
Global power monoids
This means that(\sigma ;\,g_1,\dots ,g_m)\cdot (\tau _1,\dots ,\tau _m) \ = \ (\tau _1,\dots ,\tau _m) \cdot (\sigma ;\,l_1,\dots ,l_m) \ ,and hence\Psi _{\bar{\tau }}(\sigma ;\,g_1,\dots ,g_m) \ = \ (\sigma ;\,l_1,\dots ,l_m) \ .Because(\Sigma _m\wr q)(\Psi _{\bar{\tau }}(\sigma ;\,g_1,\dots ,g_m))\ = \ (\Sigma _m\wr ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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41a4f009f28b1b8d9487a50c49932998be828ebc
subsection
210
1,121
Global power monoids
Moreover, K\times _{\alpha } G is isomorphic to K\times _{\alpha ^{\prime }} G if and only if (L,\alpha ) is conjugate to (L^{\prime },\alpha ^{\prime }) by an element of K\times G. So \mathbb {A}^+(G,K) is freely generated by the classes of the K-G-spaces K\times _{\alpha } G, where (L,\alpha ) runs through the (K\tim...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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3d8f66a7358c76717d8a2c5634cbd3038bb687cf
subsection
211
1,121
Examples
In this section we discuss various examples of ultra-commutative monoids, mostly of a geometric nature, and several geometrically defined morphisms between them. We start with the ultra-commutative monoids {\mathbf {O}} and {\mathbf {SO}} (Example REF ), {\mathbf {U}} and {\mathbf {SU}} (Example REF ), \mathbf {Sp} (Ex...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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1ca1ee81bca69bdfb26e91095160e8298f58636b
subsection
212
1,121
Examples
In the cases of the orthogonal, special orthogonal, unitary, special unitary, spin, spin^c and symplectic groups, these multiplications are symmetric, so those examples yield ultra-commutative monoids.Definition 3.2 A monoid valued orthogonal spaceorthogonal space!monoid valued is a monoid object in the category of or...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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92a396e8334f495828b598e672621db047a1e1f4
subsection
213
1,121
Examples
Then the multiplication (REF ) makes M into an ultra-commutative monoid.Example 3.6 (Orthogonal group ultra-commutative monoid) orthogonal group ultra-commutative monoid We denote by {\mathbf {O}}{\mathbf {O}} - ultra-commutative monoid of orthogonal groups the orthogonal space that sends an inner product space V to i...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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1d359e649f3134cbefbc365a3c09c6d2fb063b9f
subsection
214
1,121
Examples
If \lambda is an irreducible orthogonal G-representation, then the endomorphism ring \operatorname{Hom}^G_{{\mathbb {R}}}(\lambda ,\lambda ) is a finite-dimensional skew field extension of {\mathbb {R}}, so it is isomorphic to either {\mathbb {R}}, {\mathbb {C}} or {\mathbb {H}}; the representation \lambda is according...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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367221e542a1e62159608a735fa5191408af03b5
subsection
215
1,121
Examples
We now define an orthogonal space {\mathbf {U}} by{\mathbf {U}}(V)\ = \ U(V_{\mathbb {C}}) \ ,the unitary group of the complexification of V.unitary group The complexification of every {\mathbb {R}}-linear isometric embedding \varphi :V\longrightarrow W preserves the hermitian inner products, so we can define a continu...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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f4a11a98d84bcecaa70ddd6a4f93398d9e465660
subsection
216
1,121
Examples
So in the unitary context, we get a decomposition{\mathbf {U}}({\mathcal {U}}_G)^G\ = \ U^G({\mathcal {U}}_G^{\mathbb {C}}) \ = \ {\prod }^{\prime }_{[\lambda ]}\ U^G({\mathcal {U}}_\lambda ^{\mathbb {C}})\ \ \cong \ {\prod }^{\prime }_{[\lambda ]}\ U \ .This weak product is indexed by the isomorphism classes of irredu...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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675063cbc8e03bb5e4a0eb77752c0785e4ac10d3
subsection
217
1,121
Examples
We can thus define the realification morphismrealification morphism!from {\mathbf {U}} to {\mathbf {O}}r \ : \ {\mathbf {U}}\ \longrightarrow \ \operatorname{sh}^\otimes _{\mathbb {C}}( {\mathbf {SO}})at V as the inclusion r(V): U(V_{\mathbb {C}})\longrightarrow O({\mathbb {C}}\otimes V). Here \operatorname{sh}^\otimes...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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a98be4a05fd9c8ebff5142813bef1887809d8eb2
subsection
218
1,121
Examples
Quaternionic representations decompose canonically into isotypical summands, and this results in a product decomposition for the G-fixed subgroup\mathbf {Sp}({\mathcal {U}}_G)^G\ = \ ( Sp({\mathcal {U}}_G^{\mathbb {H}}))^G \ = \ {\prod }^{\prime }_{[\lambda ]}\, (Sp({\mathcal {U}}_\lambda ^{\mathbb {H}}))^G\ ,where the...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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3d08e91073b681edd3140519e6773f98c8c1099c
subsection
219
1,121
Examples
The compositeV \ \xrightarrow{}\ T V \ \xrightarrow{} \ \operatorname{Cl}(V)is {\mathbb {R}}-linear and injective, and we denote it by v\mapsto [v].We recall that orthogonal vectors of V anti-commute in the Clifford algebra: given v, \bar{v}\in V with \langle v,\bar{v}\rangle =0, then[v][\bar{v}] + [\bar{v}][ v] \ = \ ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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c339a089e64b586e36057882aebbe96d11e55e80
subsection
220
1,121
Examples
The map \operatorname{Pin}(\varphi ) induced by a linear isometric embedding \varphi :V\longrightarrow W is homogeneous, so it restricts to a homomorphism\operatorname{Spin}(\varphi )\ = \ \operatorname{Pin}(\varphi )|_{\operatorname{Spin}(V)} \ : \ \operatorname{Spin}(V)\ \longrightarrow \ \operatorname{Spin}(W)betwee...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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298a1ea6fad2c00044ee6e3e4c976f3807e11825
subsection
221
1,121
Examples
The pin^c grouppin^c group of V is the subgroup\operatorname{Pin}^c(V) \ \subset \ ({\mathbb {C}}\otimes _{\mathbb {R}}\operatorname{Cl}(V))^\timesgenerated inside the multiplicative group by the unit scalars \lambda \otimes 1 for all \lambda \in U(1) and the elements 1\otimes [v] for all unit vectors v\in S(V). The pi...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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175a7b0317d4c46419dba6784e52edd2165fe8e2
subsection
222
1,121
Examples
As V varies, the spin^c groups from a group valued orthogonal subspace {\mathbf {Spin}}^c of {\mathbf {Pin}}^c.spin^c group ultra-commutative monoid{\mathbf {Spin}}^c - ultra-commutative monoid of spin^c groups As for {\mathbf {Spin}}, the images of the homomorphisms \operatorname{Spin}^c(i_V) and \operatorname{Spin}^c...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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3027a90a77aa9702fa24c6a4500a120c2056a59b
subsection
223
1,121
Examples
For every element x\in \operatorname{Pin}^c(V) the twisted conjugation mapc_x \ : \ {\mathbb {C}}\otimes _{\mathbb {R}}\operatorname{Cl}(V)\ \longrightarrow \ {\mathbb {C}}\otimes _{\mathbb {R}}\operatorname{Cl}(V) \ , \quad c_x(y)\ = \ \alpha (x)y x^{-1}is an automorphism of {\mathbb {Z}}/2-graded {\mathbb {C}}-algebr...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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739b534e19819226826a0f03e6e12f4f1bdea0d3
subsection
224
1,121
Examples
Clifford algebra|)There is yet another interesting morphism of group valued orthogonal spacesl \ : \ {\mathbf {U}}\ \longrightarrow \ \operatorname{sh}^\otimes _{\mathbb {C}}({\mathbf {Spin}}^c)that lifts the forgetful realification morphism (REF ) through\operatorname{sh}^\otimes _{\mathbb {C}}(\operatorname{ad})\ :\ ...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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7bf90c0a65ac444119a97d574659a29a7649efe6
subsection
225
1,121
Examples
The structure map induced by a linear isometric embedding \varphi :V\longrightarrow W is given by \mathbf {Gr}(\varphi )(L) = \varphi (L). A commutative multiplication on \mathbf {Gr} is given by direct sum:\mu _{V,W}\ : \ \mathbf {Gr}( V ) \times \mathbf {Gr}( W ) \ \longrightarrow \ \mathbf {Gr}( V\oplus W) \ ,\quad ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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4c7ac2b4e7ceca9266e8cab85eba311686f5b095
subsection
226
1,121
Examples
We define a map\mathbf {Gr}(V)^G \ = \ {\coprod }_{m\ge 0} \, \left( Gr_m(V) \right)^G \ \longrightarrow \ \mathbf {RO}^+(G)from this fixed point space to the monoid of isomorphism classes of G-representations by sending L \in \mathbf {Gr}(V)^G to its isomorphism class. The isomorphism class of L only depends on the pa...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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29465e931f68c03f1c0e1821f1835321825d7e2c
subsection
227
1,121
Examples
If \lambda is any irreducible orthogonal G-representation, then \pi _0^G(\tau ) sends its class to the automorphism -\operatorname{Id}_\lambda . The group {\mathbf {O}}(\lambda )^G is isomorphic to O(1), U(1) or Sp(1) depending on whether \lambda is of real, complex or quaternionic type. In the real case, the map -\ope...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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d55625f7b24c2ccd9f5a75bd4e0e2ffb7ff73da1
subsection
228
1,121
Examples
A multiplication on \mathbf {Gr}^{\operatorname{or}} is given by direct sum:\mu _{V,W}\ : \ \mathbf {Gr}^{\operatorname{or}}( V ) \times \mathbf {Gr}^{\operatorname{or}} ( W ) \ &\longrightarrow \ \mathbf {Gr}^{\operatorname{or}}( V\oplus W) \\ ((L,[b_1,\dots ,b_m]),\, (L^{\prime },[b_1^{\prime },\dots ,b_n^{\prime }])...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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ebfc90e8b4737e1b7ada40ca5d16752cb129aa0c
subsection
229
1,121
Examples
Moreover, the forgetful map \mathbf {Gr}^{\operatorname{or},\operatorname{ev}}\longrightarrow \mathbf {Gr} to the additive Grassmannian is a homomorphism of ultra-commutative monoids.Example 3.16 (Complex and quaternionic Grassmannians) The complex additive Grassmannian \mathbf {Gr}^{\mathbb {C}}additive Grassmannian!...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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da25237f02f5dc6e105fe03cc290b920494de43b
subsection
230
1,121
Examples
This orthogonal space is isomorphic to \mathbf {Gr}^{{\mathbb {C}},[m]} via{\mathbf {L}}^{\mathbb {C}}({\mathbb {C}}^m, V_{\mathbb {C}}) / U(m) \ \cong \ \mathbf {Gr}^{{\mathbb {C}},[m]}(V)\ ,\quad \varphi \cdot U(m)\ \longmapsto \ \varphi ({\mathbb {C}}^m)\ .Proposition REF  (i) then exhibits a global equivalenceB_{\o...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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ac610375eb4de71318e69aa7047dc0853b78ba17
subsection
231
1,121
Examples
A complex subspace of V_{\mathbb {C}} is invariant under \psi _V if and only if it is the complexification of an {\mathbb {R}}-subspace of V (namely the \psi _V-fixed subspace of V). So the morphism c is an isomorphism of \mathbf {Gr} onto the \psi -invariant ultra-commutative submonoid (\mathbf {Gr}^{\mathbb {C}})^\ps...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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0ad3a9b45bcf4583fc0563525e15dfdbc83ba6b0
subsection
232
1,121
Examples
The isomorphisms are also compatible with complexification and realification, in the sense of the commutative diagram:@C6mm{ {\underline{\pi }}_0(\mathbf {Gr}) [r]^-{{\underline{\pi }}_0(c)} [d]_{(\ref {eq:pi^G Gr to RO^+ G})}^\cong & {\underline{\pi }}_0(\mathbf {Gr}^{\mathbb {C}}) [r]^-{{\underline{\pi }}_0(r)} [d]^{...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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853ce1db3c369dfb1c1533b7d313c326fcff93cf
subsection
233
1,121
Examples
If W is another inner product space, then the two direct summand inclusions induce algebra homomorphisms\operatorname{Sym}(V)\ \xrightarrow{}\ \operatorname{Sym}(V\oplus W) \ \xleftarrow{} \ \operatorname{Sym}(W)\ .We use the commutative multiplication on \operatorname{Sym}(V\oplus W) to combine these into an {\mathbb ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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76253f2a7a3a124abdfaacc0a0878332ad70c0f4
subsection
234
1,121
Examples
For an inner product space V we let i:V\longrightarrow \operatorname{Sym}(V) be the embedding as the linear summand of the symmetric algebra. Then as V varies, the maps\mathbf {Gr}(V)\ = \ {\coprod }_{n\ge 0} Gr_n(V) \ \longrightarrow \ {\coprod }_{n\ge 0} Gr_n(\operatorname{Sym}(V)) \ = \ \mathbf {Gr}_\otimes (V)sendi...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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3018d7919610b72621e38f155a6ce3e6a783e912
subsection
235
1,121
Examples
Because{\mathbf {P}}(V)\ = \ \mathbf {Gr}_\otimes ^{[1]}(V) \ = \ P(\operatorname{Sym}(V))is the projective space of the symmetric algebra of V, we use the symbol {\mathbf {P}} and refer to it as the global projective space.global projective space{\mathbf {P}} - global projective space The multiplication is given by te...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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53fce8ba0173b0c2f77f36fb5a58057a651d50fa
subsection
236
1,121
Examples
For n\ge 1 and 0\le i \le n, the face map d_i:M^n\longrightarrow M^{n-1} is given byd_i(x_1,\dots x_n) \ = \left\lbrace \begin{array}{ll} (x_2,\dots ,x_n) & \mbox{for $i=0$,} \\ (x_1,\dots ,x_{i-1},x_i\cdot x_{i+1},x_{i+2},\dots ,x_n) & \mbox{for $0<i< n$,} \\ (x_1,\dots ,x_{n-1}) & \mbox{for $i=n$.} \end{array} \right...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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00eabe040d630c60bba72410a46013d1b14bb8da
subsection
237
1,121
Examples
The cofree functor takes a space A to the orthogonal space R A with values(R A)(V)\ = \ \operatorname{map}({\mathbf {L}}(V,{\mathbb {R}}^\infty ),A) \ .We endow the cofree functor with a lax symmetric monoidal transformation\mu _{A,B}\ : \ R A \boxtimes R B \ \longrightarrow \ R(A\times B)\ .To construct \mu _{A,B} we ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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57d5141cbb39a8b98cd5b3a5ce00470357ca3b28
subsection
238
1,121
Examples
We saw in Proposition REF that there is then a unique structure of global power monoid on {\underline{\pi }}_0(R(B A)), and the power operations are characterized by the relation[m](u_A)\ = \ p_m^*(u_A)where u_A\in \pi _0^A(R(B A)) is a tautological class and p_m:\Sigma _m\wr A\longrightarrow A is the homomorphism def...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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3279069450d23a0a492587ca51e792aeeec6645b
subsection
239
1,121
Examples
This \Sigma _m-action is faithful, so the semifree orthogonal space {\mathbf {L}}_{\Sigma _m,{\mathbb {R}}^m} is a global classifying space for the symmetric group. The homeomorphisms{\mathbf {L}}({\mathbb {R}}^m,V)/\Sigma _m \ \cong \ \mathbf {F}^{[m]}(V) \ , \quad \varphi \cdot \Sigma _m\ \longmapsto \ \lbrace \varph...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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f94ef1f821f6ed2c7f062d72a4b71feae07b8cd7
subsection
240
1,121
Examples
So they assemble into a map\pi _0^G ( \mathbf {F})\ = \ \operatorname{colim}_{V\in s({\mathcal {U}}_G)} \, \pi _0( \mathbf {F}(V)^G ) \ \longrightarrow \ {\mathbb {A}}^+(G)\ ,and this map is a monoid isomorphism with respect to the disjoint union of G-sets on the target. Moreover, the isomorphisms are compatible with r...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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bbc170463c30baeaa22becf973635f89b6991d58
subsection
241
1,121
Examples
The induced morphism of global power monoids is linearization: the square of monoid homomorphisms@C=18mm{ \pi _0^G(\mathbf {F})[d]_{(\ref {eq:pi^G F to A^+ G})}^\cong [r]^-{\pi _0^G(\operatorname{span})}& \pi _0^G(\mathbf {Gr})[d]^{(\ref {eq:pi^G Gr to RO^+ G})}_\cong \\ {\mathbb {A}}^+(G)[r]_-{[S]\,\longmapsto \, [{\m...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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9c4020455f2145ab1dfbe5d634bc0df000562c53
subsection
242
1,121
Examples
The unit is the identity of S^V.The equivariant homotopy set \pi _0^G(\Omega ^\bullet {\mathbb {S}}) is equal to the stable G-equivariant 0-stem \pi _0^G({\mathbb {S}}), compare Construction REF below. The monoid structure on \pi _0^G(\Omega ^\bullet {\mathbb {S}}) arising from the multiplication on \Omega ^\bullet {\m...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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c5a617517a44af2c031aaeb3e482299e62945a46
subsection
243
1,121
Examples
If \lambda is such an irreducible G-representation, then the image of the \lambda -indexed copy of {\mathbb {Z}}/2 is represented by the antipodal map of S^\lambda .In (REF ) we defined a morphism of ultra-commutative monoids \tau :\mathbf {Gr}\longrightarrow {\mathbf {O}}. The composite morphism\mathbf {Gr}\ \xrightar...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1007/bfb0085965", "end": 1093, "openalex_id": "https://openalex.org/W205144100", "raw": "T. tom Dieck, Transformation groups and representation theory. Lecture Notes in Mathematics, Vol. 766. Springer-Verlag, Berlin, 1979. viii+309 pp.",...
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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7b48d0125f9791a38d9f7b300f93be2823968aed
subsection
244
1,121
Examples
The morphism of ultra-commutative monoids (REF ) realizes the exponential morphism in the sense that the following diagram of monoid homomorphisms commutes:@C=6mm{ \pi _0^G(\mathbf {Gr})[d]_{(\ref {eq:pi^G Gr to RO^+ G})}^\cong [rr]^-{\pi _0^G(J\circ \tau )} && \pi _0^G(\Omega ^\bullet {\mathbb {S}}) @{=}[r] & (\pi _0^...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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fb2a3cf7d95ae85db7f6d484b34a137e874b1479
subsection
245
1,121
Examples
We close this section with a discussion of the complex representation ring global functor (Example REF ), and a global view on `explicit Brauer induction' (Remark REF ).Example 3.1 (Burnside ring global functor) Burnside ring global functor The Burnside ring global functor {\mathbb {A}}={\mathbf {A}}(e,-) is the unit o...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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697d9ec90c054484b08f0c7c861a12fc56c7957f
subsection
246
1,121
Examples
Indeed, for the additive generator [G/H]=t_H of {\mathbb {A}}(G) this is the relation (REF ), and for general finite G-sets it follows from the additivity formula for power operations and the fact that for two finite G-sets S and T the power (S\amalg T)^m is (\Sigma _m\wr G)-equivariantly isomorphic to the coproduct{\c...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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e3890fc18914f967b4c3bf39313139d6837258e2
subsection
247
1,121
Examples
The power operations satisfy P^m(1_A)\ = \ p_m^* \text{\quad in\quad } {\mathbf {A}}(A,\Sigma _m\wr A) \ , the inflation operation of the continuous homomorphism p_m\ :\ \Sigma _m\wr A\ \longrightarrow \ A \ , \quad (\sigma ;\,a_1,\dots ,a_m)\ \longmapsto \ a_1\cdot \ldots \cdot a_m \ .Moreover, for every global pow...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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4a0dd25ea9c817e1d49f82ac9b0a7bdebebe80cf
subsection
248
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Examples
Since the global functor {\mathbf {A}}_A\Box {\mathbf {A}}_A is representable by A\times A, the Yoneda lemma reduces the multiplicativity property to the relation\exp ({\mathbf {A}}_A,\mu ^*)((p^*_m)_m) \ = \ \exp ({\mathbf {A}}_A,q_1^*)((p_m^*)_m)\ \cdot \ \exp ({\mathbf {A}}_A,q_2^*)((p_m^*)_m)in the ring \exp ({\mat...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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677c0623b2e712db2f0ba6d3eb0029fd3ce9e9db
subsection
249
1,121
Examples
Theorem REF shows that {\underline{\pi }}_0(\Sigma ^\infty _+ R(B A)) is freely generated, as a global functor, by the stable tautological class e_A\in \pi _0^A(\Sigma ^\infty _+ R(B A)), the stabilization of the unstable tautological class u_A. The characterization of the multiplication and power operations on {\math...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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a1a1cc901ec6943938fe880c12df8a6485dd88bf
subsection
250
1,121
Examples
We already know thatthe class u_G freely generates {\underline{\pi }}_0(B_{\operatorname{gl}}G) as a Rep-functor (Proposition REF  (ii)), the class u_G^{umon}=\pi _0^G(\eta )(u_G) freely generates {\underline{\pi }}_0({\mathbb {P}}(B_{\operatorname{gl}}G)) as a global power monoid (Theorem REF  (ii)), and the class e...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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d06bd32b2e818dbc7b29ccfd69324f93c11fdb9d
subsection
251
1,121
Examples
For every global power functor R and every element x\in R(G) there is a unique morphism of global power functors f:{\underline{\pi }}_0(\Sigma ^\infty _+ {\mathbb {P}}(B_{\operatorname{gl}} G))\longrightarrow R such that f(u_G^{ucom}) = x.(i) The ultra-commutative monoid {\mathbb {P}}(B_{\operatorname{gl}}G) is the dis...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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44081eab3b4ceafa6daaae03cdb2cf49b3738781
subsection
252
1,121
Examples
Hence the morphism\psi \ = \ {\bigoplus }_{m\ge 0}\psi _m \ : \ C_G \ = \ &{\bigoplus }_{m\ge 0}\,{\mathbf {A}}(\Sigma _m\wr G,-)\\ \longrightarrow \ &{\bigoplus }_{m\ge 0 }\,{\underline{\pi }}_0(\Sigma ^\infty _+{\mathbb {P}}^m(B_{\operatorname{gl}}G))\ = \ {\underline{\pi }}_0(\Sigma ^\infty _+{\mathbb {P}}(B_{\opera...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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9ca0a413d40feeddfac967a9af80d01c95ee8f7e
subsection
253
1,121
Examples
In this upgraded setting, the global power functor R[M] has a similar characterization as in the previous paragraph: for a global power functor S, we let\operatorname{Mon}(S) \ = \ \lbrace x\in S(e)\ | \ \text{$P^m(x)=(p_{\Sigma _m})^*(x)$ for all $m\ge 1$}\rbracebe the set of monoid-like elements of S; here p_{\Sigma ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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aa55c89a50d52de7a4be8f0fe3a80500ea66b384
subsection
254
1,121
Examples
Hence the morphism\eta _{\underline{B}}\ : \ \exp (\underline{B}) \ \longrightarrow \ \underline{B}is an isomorphism of global Green functors. So when restricted to constant global Green functors, the exp comonad is isomorphic to the identity. Thus \underline{B} has a unique structure of coalgebra over the comonad \exp...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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dfb9db14f63ff27cf14b9fadb23e984ca8f45577
subsection
255
1,121
Examples
The Eilenberg-Mac Lane spectrum {\mathcal {H}}A{\mathcal {H}}A - Eilenberg-Mac Lane spectrum of an abelian group is defined at an inner product space V by({\mathcal {H}}A)(V) \ = \ A[S^V] \ ,the reduced A-linearizationlinearization!of a space of the V-sphere. The orthogonal group O(V) acts through the action on S^V and...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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3b468ba3481dc618a45979689cf3eb95d27beab3
subsection
256
1,121
Examples
Since {\mathcal {H}}A is globally connective (by the next proposition), there is a unique morphism\rho \ : \ {\mathcal {H}}A \ \longrightarrow \ H\underline{A}in the global stable homotopy category that realizes the morphism on \pi _0^e.Proposition 3.8 For every abelian group A the Eilenberg-Mac Lane spectrum  {\mathc...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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5bc0ccf579c012ca7672181daebfaae8f7718221
subsection
257
1,121
Examples
This shows that {\mathcal {H}}A is a {{\mathcal {F}}in}-\Omega -spectrum for the constant global functor \underline{A}.We offer an independent proof of the {{\mathcal {F}}in}-\Omega -property via the {\mathbf {\Gamma }}-G-space techniques of Segal and Shimakawa , ,Gamma-space@{\mathbf {\Gamma }}-space!equivariant in ou...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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3f6b44d97d5d6185d2d1eaed589a94d8f278fcd3
subsection
258
1,121
Examples
Before we do so, we compare {\mathcal {H}}{\mathbb {Z}} to the `infinite symmetric product of the sphere spectrum'.Example 3.9 (Infinite symmetric product) infinite symmetric product spectrum There is no essential difference if we consider the infinite symmetric product S\! p^\infty (i.e., the reduced free abelian mono...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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ecfd229112424b6ed51d04b9e53d56ab40072f76
subsection
259
1,121
Examples
Proposition REF provides homeomorphisms(S\! p^\infty (S^V))^G \ \cong \ (S\! p^\infty (S^{V^{G^\circ }}))^{\bar{G}} \text{\qquad and\qquad } ({\mathbb {Z}}[S^V])^G \cong \ ({\mathbb {Z}}[S^{V^{G^\circ }}])^{\bar{G}} \ .Since V^{G^\circ } is an orthogonal representation of the finite group \bar{G} the map(S\! p^\infty (...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.48550/arxiv.math/0304099", "end": 441, "openalex_id": "https://openalex.org/W2063164592", "raw": "D. Dugger, An Atiyah-Hirzebruch spectral sequence for KR-theory. K-theory 35 (2005), 213–256.", "source_ref_id": "207a2e6f194f7e33dc7...
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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966908538671f8d2f564e20413b72d233fdf66fc
subsection
260
1,121
Examples
Theorem 3.12 of shows that the global functor {\underline{\pi }}_0(S\! p^n) is the quotient of the Burnside ring global functor by the global subfunctor generated by the element n\cdot 1- t_{\Sigma _{n-1}}^{\Sigma _n} in {\mathbb {A}}(\Sigma _n),{\underline{\pi }}_0(S\! p^n) \ \cong \ {\mathbb {A}}/\langle n\cdot 1 \ -...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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99d6d6549f637c58a2619fa0a1425a400f1a9bc4
subsection
261
1,121
Examples
An explicit example for which \pi _0^G( {\mathcal {H}}{\mathbb {Z}}) has rank bigger than one is G=S U(2).special unitary group!S U(2) Then the classes 1 and \operatorname{tr}_N^{S U(2)}(1) are a {\mathbb {Z}}-basis for \pi _0^{S U(2)}( {\mathcal {H}}{\mathbb {Z}}) modulo torsion, see , where N is a maximal torus norma...
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10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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eda6e5cd75733c311600712b4c36abeccb236152
subsection
262
1,121
Examples
Since the restriction of {\underline{\pi }}_0({\mathcal {H}}A) to finite groups is a constant global functor, the relation\operatorname{Tr}_{C^{\prime }}^{U(1)}\circ (-\wedge S^1)&\circ p_{C^{\prime }}^* \ = \ \operatorname{Tr}_C^{U(1)}\circ \operatorname{tr}_{C^{\prime }}^C\circ (-\wedge S^1)\circ p_{C^{\prime }}^* \\...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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fe9834177ee048eb9fc41853feae65016b771718
subsection
263
1,121
Examples
The isotropy separation sequence (REF ) thus shows that the map E{\mathcal {P}}\longrightarrow \ast induces an isomorphism\pi _1^{U(1)}({\mathcal {H}}A\wedge E{\mathcal {P}}_+)\ \cong \ \pi _1^{U(1)}({\mathcal {H}}A) \ ,where E{\mathcal {P}} is a universal U(1)-space for the family of proper closed (i.e., finite) subgr...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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5c8aa6d8f4024bd5c7fd38a19b62e59af407651d
subsection
264
1,121
Examples
Since {\mathcal {H}}A\wedge X_+ is a mapping telescope, its equivariant homotopy groups can be calculated as the colimit of the sequence:\pi _1^{U(1)}({\mathcal {H}}A\wedge U(1)_+) \ \longrightarrow \ \dots \ \longrightarrow \ \pi _1^{U(1)}({\mathcal {H}}A\wedge (U(1)/C_{n !})_+) \ \longrightarrow \ \dotsWe rewrite thi...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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7c650806366cc5bb39f51dda5011075cc7f6534d
subsection
265
1,121
Examples
The global homotopy type of b E is that of a Borel cohomology theory, and in particular,\pi _0^G( b E) \ \cong \ E^0(B G)\ ,natural in G for transfers and restriction maps. The functor b is lax symmetric monoidal, so it takes an ultra-commutative ring spectrum R to an ultra-commutative ring spectrum b R; the power oper...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1007/bf02684592", "end": 1279, "openalex_id": "https://openalex.org/W2037832049", "raw": "G. Segal, The representation ring of a compact Lie group. Inst. Hautes Études Sci. Publ. Math. 34 (1968), 113–128.", "source_ref_id": "93a5d7...
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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45cd4cdcee4d9a99485f391b85b62e6e8527302e
subsection
266
1,121
Examples
If W is another G-representation, then(V\oplus W)^{\otimes m} \text{\qquad and\qquad } {\bigoplus }_{k=0}^m \, \operatorname{tr}_{ (\Sigma _k\wr G)\times (\Sigma _{m-k}\wr G)}^{\Sigma _m\wr G} (V^{\otimes k}\otimes W^{\otimes (m-k)})are isomorphic as (\Sigma _m\wr G)-representations, because tensor product distributes ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1136, "openalex_id": "", "raw": "R. Brauer, On Artin's L-series with general group characters. Ann. of Math. (2) 48 (1947), 502–514.", "source_ref_id": "221ee824045151374c8f1ca810e2aaac826f4c90", "start": 881 }, ...
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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d164dff093c8a696d9dc55ca1be788f0ef785c5e
subsection
267
1,121
Examples
Any unitary representation of a compact Lie group G of dimension n is isomorphic to \alpha ^*(\tau _n) for a continuous homomorphism \alpha :G\longrightarrow U(n); so the class of such a representation equals\alpha ^*(i_!(q^*(x)))\ \in \ \mathbf {RU}(G) \ .So the global functor \mathbf {RU} is generated by the single c...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1007/bf01394272", "end": 461, "openalex_id": "https://openalex.org/W4230690795", "raw": "V. P. Snaith, Explicit Brauer induction. Invent. Math. 94 (1988), no. 3, 455–478.", "source_ref_id": "979e93cae9b68dba5d84e67fa6e77495efb7b0fa...
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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acd870fb8d90a23788e359a56e7cd20455d21c0f
subsection
268
1,121
Examples
The value of b_G at the 1-dimensional representation with character \chi :G\longrightarrow U(1) is given by b_G[\chi ^*(\tau _1)]\ = \ \chi ^* \ \in \ {\mathbf {A}}(U(1),G)\ .Every class in \mathbf {RU}(G) is a formal difference of classes of actual representations, and every n-dimensional representation is the restri...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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3a731b5d98e543aeacdd7bd909588aa22f8f3fa9
subsection
269
1,121
Examples
To write the class b_G[V] as a {\mathbb {Z}}-linear combination of transfers of 1-dimensional representations of subgroups of G, one would now have to write the classifying homomorphism \alpha :G\longrightarrow U(n) for V as the composite of an epimorphism and a subgroup inclusion and then expand the term \alpha ^*\cir...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 574, "openalex_id": "", "raw": "R. Boltje, A canonical Brauer induction formula. Astérisque No. 181–182 (1990) 5, 31–59.", "source_ref_id": "615fcf51c53ef67dff47589e5c1f2eab9b2f9b55", "start": 484 }, { "a...
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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8f5272aa368c8755bf5a05d10e9353661fddc6b0
subsection
270
1,121
Global forms of
In this section we discuss different orthogonal monoid spaces whose underlying non-equivariant homotopy type is B O, a classifying space for the infinite orthogonal group. Each example is interesting in its own right, and as a whole, the global forms of B O are a great illustration of how non-equivariant homotopy types...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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5fd1cb1512e9ec5f7b75d9238d04d3899950639d
subsection
271
1,121
Global forms of
All weak morphisms above can be arranged to preserve the E_\infty -multiplications, so they induce additive maps of abelian monoids on \pi _0^G for every compact Lie group G.As we explain in Example REF , the bar construction model makes sense more generally for monoid valued orthogonal spaces; in particular, applying ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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d4196445961812038520d59c0f2a60c4103b7a30
subsection
272
1,121
Global forms of
In particular, the orthogonal group O(V) acts on {\mathbf {BOP}}(V) through its diagonal action on V^2.We make the orthogonal space {\mathbf {BOP}} into an ultra-commutative monoid by endowing it with multiplication maps\mu _{V,W}\ : \ {\mathbf {BOP}}(V) \times {\mathbf {BOP}}(W) \ \longrightarrow \ {\mathbf {BOP}}(V\o...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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fa20c325bdc0e2b6bbb8fa8510f03fc9d2173fb6
subsection
273
1,121
Global forms of
This orthogonal space is a `multiplicative shift' of \mathbf {Gr} in the sense of Example REF , it admits a commutative multiplication in much the same way as \mathbf {Gr}, and the maps\mathbf {Gr}(V)\ \longrightarrow \ \mathbf {Gr}^{\prime }(V) \ , \quad L \ \longmapsto \ L\oplus 0form a global equivalence of ultra-co...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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6eec4be4093f0b62f127297410da6a463d95d753
subsection
274
1,121
Global forms of
We let \alpha :A\longrightarrow R(V) and \beta :A\longrightarrow R(W) be two G-maps that represent classes in [A,R]^G. Then their sum is defined as[\alpha ] +[\beta ] \ = \ [\mu _{V,W}(\alpha ,\beta )] \ ,where \mu _{V,W}:R(V)\times R(W)\longrightarrow R(V\oplus W) is the (V,W)-component of the multiplication of R. The...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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40866b4ed6091aab964798285b3663cae94a420e
subsection
275
1,121
Global forms of
We can thus define a G-equivariant homotopyK \ : \ [0,1]\times G r(V^2) \ \longrightarrow \ G r(V^2\oplus V^2) \text{\quad by\quad } K(t,L) \ =\ (L\oplus 0\oplus 0) + H_L(t,L^\perp )\ .ThenK(0,L)\ =\ (L\oplus 0\oplus 0) + H_L(0,L^\perp ) \ = \ (L\oplus 0) +(0\oplus L^\perp ) \ = \ L\oplus L^\perpandK(1,L)\ &=\ (L\oplus...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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ed39e28285368baa2e68d7ddb25b5e638a6e54c3
subsection
276
1,121
Global forms of
The composite of \alpha and the orthogonal complement map (-)^\perp :{\mathbf {BOP}}(V)\longrightarrow {\mathbf {BOP}}(V) represents another class in [A,{\mathbf {BOP}}]^G, and[\alpha ]+ [(-)^\perp \circ \alpha ]\ &= \ [\mu ^{{\mathbf {BOP}}}_{V,V}\circ (\operatorname{Id}, (-)^\perp )\circ \alpha ]\ = \ [c_{V\oplus V\o...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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008e27133775fb68c9b087c093ffe0193ae42d06
subsection
277
1,121
Global forms of
We let c_V:A\longrightarrow \mathbf {Gr}(V) denote the constant map with value V and \chi :V^4\longrightarrow V^4 the linear isometry defined by\chi (v_1,v_2,v_3,v_4)\ = \ (v_2,v_3,v_1,v_4)\ .We observe that the following diagram commutes:@C=10mm{ {\mathbf {BOP}}(V)@{=}[d] [rr]^-{(i(V)\circ c_V,\operatorname{Id})} && {...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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c3a0adef3ff73009345a788ccb9ee689106bf1f1
subsection
278
1,121
Global forms of
The map i(V):\mathbf {Gr}(V)\longrightarrow {\mathbf {BOP}}(V)=\mathbf {Gr}(V\oplus V) factors as the composite\mathbf {Gr}(V)\ \xrightarrow{}\ \mathbf {Gr}(V)\times \mathbf {Gr}(V)\ \xrightarrow{}\ \mathbf {Gr}(V\oplus V) \ ,so[c_V]\ + a \ &= \ [c_V]+[\alpha ]\ = \ [\mu _{V,V}^{\mathbf {Gr}}\circ (c_V,\alpha )] \\ &= ...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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37861d8955831f66bee92ae5094138980a08f1e3
subsection
279
1,121
Global forms of
We pull back the tautological G-vector bundle \gamma _V over \mathbf {Gr}(V) and obtain a G-vector bundle f^\star (\gamma _V):E\longrightarrow A over A with total spaceE\ = \ \lbrace (v,a)\in V\times A\ | \ v\in f(a)\rbrace \ .The G-action and bundle structure are as a G-subbundle of the trivial bundle V\times A. Since...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1007/bf02684593", "end": 530, "openalex_id": "https://openalex.org/W2081208693", "raw": "G. Segal, Equivariant K-theory. Inst. Hautes Études Sci. Publ. Math. 34 (1968), 129–151.", "source_ref_id": "17535a38489d3d5e30feb0c0c9b21b2f6...
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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0655cc931f837631a4a7053c5675404fbf1eac95
subsection
280
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Global forms of
So there is a unique homomorphism of abelian groups\langle -\rangle \ : \ [A,{\mathbf {BOP}}]^G \ = \ \operatorname{colim}_{V\in s({\mathcal {U}}_G)}\, [A,\, {\mathbf {BOP}}(V) ]^G \ \longrightarrow \ {\mathbf {KO}}_G(A)such that the following square commutes:\begin{aligned} @C=20mm{ [A,\mathbf {Gr}]^G [d]_{[A,i]^G} [r...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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d91058a81fe3a26b1f07d634af894450a04cc11c
subsection
281
1,121
Global forms of
As G varies the isomorphisms are compatible with restriction along continuous homomorphism.The Grassmannian \mathbf {Gr} is the disjoint union of the homogeneous pieces \mathbf {Gr}^{[n]}, and the latter is isomorphic to the semifree orthogonal space {\mathbf {L}}_{O(n),{\mathbb {R}}^n}, via{\mathbf {L}}({\mathbb {R}}^...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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665205dd76f4657790745bc8eda8a1a267ff9ec3
subsection
282
1,121
Global forms of
Moreover, A_{(n)} is G-invariant, so the restriction \xi _{(n)} of the bundle to A_{(n)} is classified by a G-map f_{(n)}:A_{(n)}\longrightarrow \mathbf {Gr}^{[n]}(V_n) for some finite-dimensional G-representation V_n. Since A is compact, almost all A_{(n)} are empty, so by increasing the representations, if necessary,...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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b23dd9b41233f095e56a938191e1d919ddcf17bf
subsection
283
1,121
Global forms of
This special case identifies the global power monoid {\underline{\pi }}_0({\mathbf {BOP}}) with the global power monoid \mathbf {RO}\mathbf {RO} - orthogonal representation ring global functorrepresentation ring!orthogonal of orthogonal representation rings. For every compact Lie group G the abelian monoid \mathbf {RO}...
{ "cite_spans": [ { "arxiv_id": "", "doi": "10.1007/bf02684593", "end": 1747, "openalex_id": "https://openalex.org/W2081208693", "raw": "G. Segal, Equivariant K-theory. Inst. Hautes Études Sci. Publ. Math. 34 (1968), 129–151.", "source_ref_id": "17535a38489d3d5e30feb0c0c9b21b2f...
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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7c6c0004a443cfb56e4483ab5f4b5ac8a0ce9a13
subsection
284
1,121
Global forms of
We have to argue that in addition, the maps (REF ) are also compatible with transfers (or equivalently, with power operations). The compatibility with transfers can either be deduced directly from the definitions; equivalently it can be formally deduced from the compatibility of the isomorphisms {\underline{\pi }}_0(\m...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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fd2dd05506cc55b49c4289f190b41b583d0f2518
subsection
285
1,121
Global forms of
We make \mathbf {B}^\circ {\mathbf {O}} into an ultra-commutative monoid by endowing it with multiplication maps\mu _{V,W}\ : \ (\mathbf {B}^\circ {\mathbf {O}})(V) \times (\mathbf {B}^\circ {\mathbf {O}})(W) \ \longrightarrow \ (\mathbf {B}^\circ {\mathbf {O}})(V\oplus W)defined as the compositeB ( O(V) ) \times B ( O...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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7112f85b771968428ae8a3e9cd33aa65a3edd160
subsection
286
1,121
Global forms of
We define an ultra-commutative monoid \mathbf {B}^{\prime }{\mathbf {O}} by combining the constructions of \mathbf {B}^\circ {\mathbf {O}} (bar construction) and {\mathbf {BO}} (Grassmannians) into one definition. The value of \mathbf {B}^{\prime }{\mathbf {O}} at an inner product space V is(\mathbf {B}^{\prime }{\math...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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affbd1a53bb90f1f79c2f265801941c3d4a2228a
subsection
287
1,121
Global forms of
We define a continuous map\varphi _\sharp \ : \ {\mathbf {L}}(V,V^2)\ \longrightarrow \ {\mathbf {L}}(W,W^2)by(\varphi _\sharp \psi )(\varphi (v)+ w)\ = \ \varphi ^2( \psi (v) + (w,0) )\ ;here v\in V and w\in W-\varphi (V) is orthogonal to \varphi (V). The map \varphi _\sharp is compatible with the actions of the ortho...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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a2a8abc903bacef27bc235e6f79bd55482d12744
subsection
288
1,121
Global forms of
The right map \beta (V) is the canonical map from homotopy orbits to strict orbits. As V varies, the \alpha and \beta maps form morphisms of ultra-commutative monoids\mathbf {B}^\circ {\mathbf {O}}\ \xleftarrow{} \ \mathbf {B}^{\prime }{\mathbf {O}}\ \xrightarrow{}\ {\mathbf {BO}}\ ,essentially by construction. As we s...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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6a18947903ddef8caccf04bd1d8b73365c784c58
subsection
289
1,121
Global forms of
Indeed, the proposition shows that the G-fixed points of \mathbf {B}^{\prime }{\mathbf {O}}(V)=|B_\bullet ({\mathbf {L}}(V,V^2),O(V), O(V))|/O(V) are a disjoint union, indexed by conjugacy classes of continuous homomorphisms \gamma :G\longrightarrow O(V) of the spaces|B_\bullet ({\mathbf {L}}(V,V^2),O(V), O(V))| ^{\Gam...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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665af82c7823cbacfd0efa77a90bf32f497c716f
subsection
290
1,121
Global forms of
So the upper horizontal quotient map also becomes arbitrarily highly connected as V grows. Hence the map \alpha (V)^G becomes an equivalence\operatorname{tel}_i\, \alpha (V_i)^G\ : \ \operatorname{tel}_i\, (\mathbf {B}^{\prime }{\mathbf {O}}(V_i))^G \ \longrightarrow \ \operatorname{tel}_i\, (\mathbf {B}^\circ {\mathbf...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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68faa51615bf717db3ebae809615d5fab7860135
subsection
291
1,121
Global forms of
The claim then follows by passing to colimits over V in s({\mathcal {U}}_G).We showed in part (i) that the inclusions of G-fixed points {\mathbf {L}}^G(V,V^2)\longrightarrow {\mathbf {L}}(V,V^2) and O^G(V)\longrightarrow O(V) induce a homeomorphism| B_\bullet ({\mathbf {L}}^G(V,V^2),O^G(V),\ast )|\ \xrightarrow{} \ |B_...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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21ef3415d30590b6cdc7e08e113c88d65f3c28bf
subsection
292
1,121
Global forms of
Now we determine the entire homotopy types of the G-fixed point spaces of the three ultra-commutative monoids \mathbf {B}^\circ {\mathbf {O}}, {\mathbf {BO}} and {\mathbf {BOP}}.Corollary 4.16 Let G be a compact Lie group.The G-fixed point space of \mathbf {B}^\circ {\mathbf {O}} is a classifying space of the group O^...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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92443e048b736910e722883947618a61a3e4b3b1
subsection
293
1,121
Global forms of
Since G-fixed points also commute with the filtered colimit at hand (see Proposition REF  (ii)), we have(\mathbf {B}^\circ {\mathbf {O}}({\mathcal {U}}_G))^G \ &= \ \left( \operatorname{colim}_{V\in s({\mathcal {U}}_G)} \mathbf {B}^\circ {\mathbf {O}}(V) \right)^G \\ &\cong \ \operatorname{colim}_{V\in s({\mathcal {U}}...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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03313f17c64985afde6c8eac79ec22b6bb1ed98d
subsection
294
1,121
Global forms of
The classifying space construction commutes with weak products, which gives a weak equivalenceB (O^G({\mathcal {U}}_G)) \ \simeq \ {\prod }^{\prime } B( O^G({\mathcal {U}}_\lambda )) \ .Moreover, the group O^G({\mathcal {U}}_\lambda ) is isomorphic to an infinite orthogonal, unitary or symplectic group, depending on th...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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8d457473cc19544b4ad78fd1650ce18c5732f579
subsection
295
1,121
Global forms of
So hitting all the previous examples with the bar construction yields a commutative diagram of globally connected orthogonal spaces:@C=15mm{ \mathbf {B}^\circ {\mathbf {SU}}[r]^-{\mathbf {B}^\circ \text{incl}} @{-->}[d]_{\mathbf {B}^\circ l} & \mathbf {B}^\circ {\mathbf {U}}@{-->}[d]_{\mathbf {B}^\circ l} @{-->}[dr]^-{...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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17f510e12e3ab529ed38f22e36778310a08623a6
subsection
296
1,121
Global forms of
The structure map {\mathbf {bO}}(\varphi ):{\mathbf {bO}}(V)\longrightarrow {\mathbf {bO}}(W) is given by{\mathbf {bO}}(\varphi )(L) \ = \ (\varphi \oplus {\mathbb {R}}^\infty )(L) + ( (W-\varphi (V))\oplus 0)\ ,the internal orthogonal sum of the image of L under \varphi \oplus {\mathbb {R}}^\infty :V\oplus {\mathbb {R...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
[ 581, 45646, 22288, 150598, 275, 670, 1961, 19379, 125458, 856, 10617, 54969, 118201, 1456, 34475, 390, 866, 31, 32108, 46632, 997, 757, 70796, 707, 24948, 6126, 10554, 111, 29569, 339, 1379, 1052, 47391, 939, 5125, 601, 110633, 21455, 12984...
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0a52044d4b6c1aa638a0425a8b4103756eb751cb
subsection
297
1,121
Global forms of
Moreover, for every linear isometric embedding \varphi :V\longrightarrow W the relation\left({\mathbf {bO}}(\varphi )(L)\right)^\perp \ &= \ \left( (\varphi \oplus {\mathbb {R}}^\infty )(L) +(W-\varphi (V))\oplus 0 \right)^\perp \\ &= \ \left(\varphi (L^\perp ) + (W^\perp -\varphi (V^\perp ))\right)\oplus 0 \ = \ \left...
{ "cite_spans": [] }
10.1017/9781108349161
1802.09382
Global homotopy theory
[ "Stefan Schwede" ]
[ "math.AT" ]
2,018
en
Mathematics
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