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uniform_inducing (hf : isometry f) : uniform_inducing f
hf.antilipschitz.uniform_inducing hf.uniform_continuous
theorem
isometry.uniform_inducing
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "uniform_inducing" ]
An isometry from a metric space is a uniform inducing map
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
tendsto_nhds_iff {ι : Type*} {f : α → β} {g : ι → α} {a : filter ι} {b : α} (hf : isometry f) : filter.tendsto g a (𝓝 b) ↔ filter.tendsto (f ∘ g) a (𝓝 (f b))
hf.uniform_inducing.inducing.tendsto_nhds_iff
lemma
isometry.tendsto_nhds_iff
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "filter", "filter.tendsto", "isometry" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
continuous (hf : isometry f) : continuous f
hf.lipschitz.continuous
lemma
isometry.continuous
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "continuous", "isometry" ]
An isometry is continuous.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
right_inv {f : α → β} {g : β → α} (h : isometry f) (hg : right_inverse g f) : isometry g
λ x y, by rw [← h, hg _, hg _]
lemma
isometry.right_inv
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry" ]
The right inverse of an isometry is an isometry.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_emetric_closed_ball (h : isometry f) (x : α) (r : ℝ≥0∞) : f ⁻¹' (emetric.closed_ball (f x) r) = emetric.closed_ball x r
by { ext y, simp [h.edist_eq] }
lemma
isometry.preimage_emetric_closed_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.closed_ball", "isometry" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_emetric_ball (h : isometry f) (x : α) (r : ℝ≥0∞) : f ⁻¹' (emetric.ball (f x) r) = emetric.ball x r
by { ext y, simp [h.edist_eq] }
lemma
isometry.preimage_emetric_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.ball", "isometry" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
ediam_image (hf : isometry f) (s : set α) : emetric.diam (f '' s) = emetric.diam s
eq_of_forall_ge_iff $ λ d, by simp only [emetric.diam_le_iff, ball_image_iff, hf.edist_eq]
lemma
isometry.ediam_image
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.diam", "emetric.diam_le_iff", "eq_of_forall_ge_iff", "isometry" ]
Isometries preserve the diameter in pseudoemetric spaces.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
ediam_range (hf : isometry f) : emetric.diam (range f) = emetric.diam (univ : set α)
by { rw ← image_univ, exact hf.ediam_image univ }
lemma
isometry.ediam_range
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.diam", "isometry" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
maps_to_emetric_ball (hf : isometry f) (x : α) (r : ℝ≥0∞) : maps_to f (emetric.ball x r) (emetric.ball (f x) r)
(hf.preimage_emetric_ball x r).ge
lemma
isometry.maps_to_emetric_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.ball", "isometry" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
maps_to_emetric_closed_ball (hf : isometry f) (x : α) (r : ℝ≥0∞) : maps_to f (emetric.closed_ball x r) (emetric.closed_ball (f x) r)
(hf.preimage_emetric_closed_ball x r).ge
lemma
isometry.maps_to_emetric_closed_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.closed_ball", "isometry" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
_root_.isometry_subtype_coe {s : set α} : isometry (coe : s → α)
λx y, rfl
lemma
isometry_subtype_coe
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry" ]
The injection from a subtype is an isometry
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
comp_continuous_on_iff {γ} [topological_space γ] (hf : isometry f) {g : γ → α} {s : set γ} : continuous_on (f ∘ g) s ↔ continuous_on g s
hf.uniform_inducing.inducing.continuous_on_iff.symm
lemma
isometry.comp_continuous_on_iff
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "continuous_on", "isometry", "topological_space" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
comp_continuous_iff {γ} [topological_space γ] (hf : isometry f) {g : γ → α} : continuous (f ∘ g) ↔ continuous g
hf.uniform_inducing.inducing.continuous_iff.symm
lemma
isometry.comp_continuous_iff
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "continuous", "isometry", "topological_space" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
injective (h : isometry f) : injective f
h.antilipschitz.injective
lemma
isometry.injective
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry" ]
An isometry from an emetric space is injective
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
uniform_embedding (hf : isometry f) : uniform_embedding f
hf.antilipschitz.uniform_embedding hf.lipschitz.uniform_continuous
theorem
isometry.uniform_embedding
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "uniform_embedding" ]
An isometry from an emetric space is a uniform embedding
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
embedding (hf : isometry f) : embedding f
hf.uniform_embedding.embedding
theorem
isometry.embedding
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "embedding", "isometry" ]
An isometry from an emetric space is an embedding
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
closed_embedding [complete_space α] [emetric_space γ] {f : α → γ} (hf : isometry f) : closed_embedding f
hf.antilipschitz.closed_embedding hf.lipschitz.uniform_continuous
theorem
isometry.closed_embedding
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "closed_embedding", "complete_space", "emetric_space", "isometry" ]
An isometry from a complete emetric space is a closed embedding
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
diam_image (hf : isometry f) (s : set α) : metric.diam (f '' s) = metric.diam s
by rw [metric.diam, metric.diam, hf.ediam_image]
lemma
isometry.diam_image
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "metric.diam" ]
An isometry preserves the diameter in pseudometric spaces.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
diam_range (hf : isometry f) : metric.diam (range f) = metric.diam (univ : set α)
by { rw ← image_univ, exact hf.diam_image univ }
lemma
isometry.diam_range
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "metric.diam" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_set_of_dist (hf : isometry f) (x : α) (p : ℝ → Prop) : f ⁻¹' {y | p (dist y (f x))} = {y | p (dist y x)}
by { ext y, simp [hf.dist_eq] }
lemma
isometry.preimage_set_of_dist
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_closed_ball (hf : isometry f) (x : α) (r : ℝ) : f ⁻¹' (metric.closed_ball (f x) r) = metric.closed_ball x r
hf.preimage_set_of_dist x (≤ r)
lemma
isometry.preimage_closed_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "metric.closed_ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_ball (hf : isometry f) (x : α) (r : ℝ) : f ⁻¹' (metric.ball (f x) r) = metric.ball x r
hf.preimage_set_of_dist x (< r)
lemma
isometry.preimage_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "metric.ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_sphere (hf : isometry f) (x : α) (r : ℝ) : f ⁻¹' (metric.sphere (f x) r) = metric.sphere x r
hf.preimage_set_of_dist x (= r)
lemma
isometry.preimage_sphere
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "metric.sphere" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
maps_to_ball (hf : isometry f) (x : α) (r : ℝ) : maps_to f (metric.ball x r) (metric.ball (f x) r)
(hf.preimage_ball x r).ge
lemma
isometry.maps_to_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "metric.ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
maps_to_sphere (hf : isometry f) (x : α) (r : ℝ) : maps_to f (metric.sphere x r) (metric.sphere (f x) r)
(hf.preimage_sphere x r).ge
lemma
isometry.maps_to_sphere
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "metric.sphere" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
maps_to_closed_ball (hf : isometry f) (x : α) (r : ℝ) : maps_to f (metric.closed_ball x r) (metric.closed_ball (f x) r)
(hf.preimage_closed_ball x r).ge
lemma
isometry.maps_to_closed_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "metric.closed_ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
uniform_embedding.to_isometry {α β} [uniform_space α] [metric_space β] {f : α → β} (h : uniform_embedding f) : @isometry α β (@pseudo_metric_space.to_pseudo_emetric_space α (@metric_space.to_pseudo_metric_space α (h.comap_metric_space f))) (by apply_instance) f
begin apply isometry.of_dist_eq, assume x y, refl end
lemma
uniform_embedding.to_isometry
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "metric_space", "pseudo_metric_space.to_pseudo_emetric_space", "uniform_embedding", "uniform_space" ]
A uniform embedding from a uniform space to a metric space is an isometry with respect to the induced metric space structure on the source space.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
embedding.to_isometry {α β} [topological_space α] [metric_space β] {f : α → β} (h : embedding f) : @isometry α β (@pseudo_metric_space.to_pseudo_emetric_space α (@metric_space.to_pseudo_metric_space α (h.comap_metric_space f))) (by apply_instance) f
begin apply isometry.of_dist_eq, assume x y, refl end
lemma
embedding.to_isometry
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "embedding", "isometry", "metric_space", "pseudo_metric_space.to_pseudo_emetric_space", "topological_space" ]
An embedding from a topological space to a metric space is an isometry with respect to the induced metric space structure on the source space.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
isometry_equiv (α β : Type*) [pseudo_emetric_space α] [pseudo_emetric_space β] extends α ≃ β
(isometry_to_fun : isometry to_fun)
structure
isometry_equiv
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry", "pseudo_emetric_space" ]
`α` and `β` are isometric if there is an isometric bijection between them.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
coe_eq_to_equiv (h : α ≃ᵢ β) (a : α) : h a = h.to_equiv a
rfl
lemma
isometry_equiv.coe_eq_to_equiv
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
coe_to_equiv (h : α ≃ᵢ β) : ⇑h.to_equiv = h
rfl
lemma
isometry_equiv.coe_to_equiv
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
isometry (h : α ≃ᵢ β) : isometry h
h.isometry_to_fun
lemma
isometry_equiv.isometry
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
bijective (h : α ≃ᵢ β) : bijective h
h.to_equiv.bijective
lemma
isometry_equiv.bijective
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
injective (h : α ≃ᵢ β) : injective h
h.to_equiv.injective
lemma
isometry_equiv.injective
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
surjective (h : α ≃ᵢ β) : surjective h
h.to_equiv.surjective
lemma
isometry_equiv.surjective
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
edist_eq (h : α ≃ᵢ β) (x y : α) : edist (h x) (h y) = edist x y
h.isometry.edist_eq x y
lemma
isometry_equiv.edist_eq
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
dist_eq {α β : Type*} [pseudo_metric_space α] [pseudo_metric_space β] (h : α ≃ᵢ β) (x y : α) : dist (h x) (h y) = dist x y
h.isometry.dist_eq x y
lemma
isometry_equiv.dist_eq
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "pseudo_metric_space" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
nndist_eq {α β : Type*} [pseudo_metric_space α] [pseudo_metric_space β] (h : α ≃ᵢ β) (x y : α) : nndist (h x) (h y) = nndist x y
h.isometry.nndist_eq x y
lemma
isometry_equiv.nndist_eq
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "pseudo_metric_space" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
continuous (h : α ≃ᵢ β) : continuous h
h.isometry.continuous
lemma
isometry_equiv.continuous
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "continuous" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
ediam_image (h : α ≃ᵢ β) (s : set α) : emetric.diam (h '' s) = emetric.diam s
h.isometry.ediam_image s
lemma
isometry_equiv.ediam_image
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.diam" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
to_equiv_inj : ∀ ⦃h₁ h₂ : α ≃ᵢ β⦄, (h₁.to_equiv = h₂.to_equiv) → h₁ = h₂
| ⟨e₁, h₁⟩ ⟨e₂, h₂⟩ H := by { dsimp at H, subst e₁ }
lemma
isometry_equiv.to_equiv_inj
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
ext ⦃h₁ h₂ : α ≃ᵢ β⦄ (H : ∀ x, h₁ x = h₂ x) : h₁ = h₂
to_equiv_inj $ equiv.ext H
lemma
isometry_equiv.ext
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "equiv.ext" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
mk' {α : Type u} [emetric_space α] (f : α → β) (g : β → α) (hfg : ∀ x, f (g x) = x) (hf : isometry f) : α ≃ᵢ β
{ to_fun := f, inv_fun := g, left_inv := λ x, hf.injective $ hfg _, right_inv := hfg, isometry_to_fun := hf }
def
isometry_equiv.mk'
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric_space", "inv_fun", "isometry", "mk'" ]
Alternative constructor for isometric bijections, taking as input an isometry, and a right inverse.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
refl (α : Type*) [pseudo_emetric_space α] : α ≃ᵢ α
{ isometry_to_fun := isometry_id, .. equiv.refl α }
def
isometry_equiv.refl
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "equiv.refl", "isometry_id", "pseudo_emetric_space" ]
The identity isometry of a space.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
trans (h₁ : α ≃ᵢ β) (h₂ : β ≃ᵢ γ) : α ≃ᵢ γ
{ isometry_to_fun := h₂.isometry_to_fun.comp h₁.isometry_to_fun, .. equiv.trans h₁.to_equiv h₂.to_equiv }
def
isometry_equiv.trans
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "equiv.trans" ]
The composition of two isometric isomorphisms, as an isometric isomorphism.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
trans_apply (h₁ : α ≃ᵢ β) (h₂ : β ≃ᵢ γ) (x : α) : h₁.trans h₂ x = h₂ (h₁ x)
rfl
lemma
isometry_equiv.trans_apply
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
symm (h : α ≃ᵢ β) : β ≃ᵢ α
{ isometry_to_fun := h.isometry.right_inv h.right_inv, to_equiv := h.to_equiv.symm }
def
isometry_equiv.symm
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
The inverse of an isometric isomorphism, as an isometric isomorphism.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
simps.apply (h : α ≃ᵢ β) : α → β
h
def
isometry_equiv.simps.apply
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
See Note [custom simps projection]. We need to specify this projection explicitly in this case, because it is a composition of multiple projections.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
simps.symm_apply (h : α ≃ᵢ β) : β → α
h.symm initialize_simps_projections isometry_equiv (to_equiv_to_fun → apply, to_equiv_inv_fun → symm_apply)
def
isometry_equiv.simps.symm_apply
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "isometry_equiv" ]
See Note [custom simps projection]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
symm_symm (h : α ≃ᵢ β) : h.symm.symm = h
to_equiv_inj h.to_equiv.symm_symm
lemma
isometry_equiv.symm_symm
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
apply_symm_apply (h : α ≃ᵢ β) (y : β) : h (h.symm y) = y
h.to_equiv.apply_symm_apply y
lemma
isometry_equiv.apply_symm_apply
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
symm_apply_apply (h : α ≃ᵢ β) (x : α) : h.symm (h x) = x
h.to_equiv.symm_apply_apply x
lemma
isometry_equiv.symm_apply_apply
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
symm_apply_eq (h : α ≃ᵢ β) {x : α} {y : β} : h.symm y = x ↔ y = h x
h.to_equiv.symm_apply_eq
lemma
isometry_equiv.symm_apply_eq
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
eq_symm_apply (h : α ≃ᵢ β) {x : α} {y : β} : x = h.symm y ↔ h x = y
h.to_equiv.eq_symm_apply
lemma
isometry_equiv.eq_symm_apply
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
symm_comp_self (h : α ≃ᵢ β) : ⇑h.symm ∘ ⇑h = id
funext $ assume a, h.to_equiv.left_inv a
lemma
isometry_equiv.symm_comp_self
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
self_comp_symm (h : α ≃ᵢ β) : ⇑h ∘ ⇑h.symm = id
funext $ assume a, h.to_equiv.right_inv a
lemma
isometry_equiv.self_comp_symm
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
range_eq_univ (h : α ≃ᵢ β) : range h = univ
h.to_equiv.range_eq_univ
lemma
isometry_equiv.range_eq_univ
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
image_symm (h : α ≃ᵢ β) : image h.symm = preimage h
image_eq_preimage_of_inverse h.symm.to_equiv.left_inv h.symm.to_equiv.right_inv
lemma
isometry_equiv.image_symm
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_symm (h : α ≃ᵢ β) : preimage h.symm = image h
(image_eq_preimage_of_inverse h.to_equiv.left_inv h.to_equiv.right_inv).symm
lemma
isometry_equiv.preimage_symm
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
symm_trans_apply (h₁ : α ≃ᵢ β) (h₂ : β ≃ᵢ γ) (x : γ) : (h₁.trans h₂).symm x = h₁.symm (h₂.symm x)
rfl
lemma
isometry_equiv.symm_trans_apply
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
ediam_univ (h : α ≃ᵢ β) : emetric.diam (univ : set α) = emetric.diam (univ : set β)
by rw [← h.range_eq_univ, h.isometry.ediam_range]
lemma
isometry_equiv.ediam_univ
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.diam" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
ediam_preimage (h : α ≃ᵢ β) (s : set β) : emetric.diam (h ⁻¹' s) = emetric.diam s
by rw [← image_symm, ediam_image]
lemma
isometry_equiv.ediam_preimage
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.diam" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_emetric_ball (h : α ≃ᵢ β) (x : β) (r : ℝ≥0∞) : h ⁻¹' (emetric.ball x r) = emetric.ball (h.symm x) r
by rw [← h.isometry.preimage_emetric_ball (h.symm x) r, h.apply_symm_apply]
lemma
isometry_equiv.preimage_emetric_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_emetric_closed_ball (h : α ≃ᵢ β) (x : β) (r : ℝ≥0∞) : h ⁻¹' (emetric.closed_ball x r) = emetric.closed_ball (h.symm x) r
by rw [← h.isometry.preimage_emetric_closed_ball (h.symm x) r, h.apply_symm_apply]
lemma
isometry_equiv.preimage_emetric_closed_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.closed_ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
image_emetric_ball (h : α ≃ᵢ β) (x : α) (r : ℝ≥0∞) : h '' (emetric.ball x r) = emetric.ball (h x) r
by rw [← h.preimage_symm, h.symm.preimage_emetric_ball, symm_symm]
lemma
isometry_equiv.image_emetric_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
image_emetric_closed_ball (h : α ≃ᵢ β) (x : α) (r : ℝ≥0∞) : h '' (emetric.closed_ball x r) = emetric.closed_ball (h x) r
by rw [← h.preimage_symm, h.symm.preimage_emetric_closed_ball, symm_symm]
lemma
isometry_equiv.image_emetric_closed_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric.closed_ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
to_homeomorph (h : α ≃ᵢ β) : α ≃ₜ β
{ continuous_to_fun := h.continuous, continuous_inv_fun := h.symm.continuous, to_equiv := h.to_equiv }
def
isometry_equiv.to_homeomorph
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
The (bundled) homeomorphism associated to an isometric isomorphism.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
coe_to_homeomorph (h : α ≃ᵢ β) : ⇑(h.to_homeomorph) = h
rfl
lemma
isometry_equiv.coe_to_homeomorph
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
coe_to_homeomorph_symm (h : α ≃ᵢ β) : ⇑(h.to_homeomorph.symm) = h.symm
rfl
lemma
isometry_equiv.coe_to_homeomorph_symm
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
comp_continuous_on_iff {γ} [topological_space γ] (h : α ≃ᵢ β) {f : γ → α} {s : set γ} : continuous_on (h ∘ f) s ↔ continuous_on f s
h.to_homeomorph.comp_continuous_on_iff _ _
lemma
isometry_equiv.comp_continuous_on_iff
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "continuous_on", "topological_space" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
comp_continuous_iff {γ} [topological_space γ] (h : α ≃ᵢ β) {f : γ → α} : continuous (h ∘ f) ↔ continuous f
h.to_homeomorph.comp_continuous_iff
lemma
isometry_equiv.comp_continuous_iff
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "continuous", "topological_space" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
comp_continuous_iff' {γ} [topological_space γ] (h : α ≃ᵢ β) {f : β → γ} : continuous (f ∘ h) ↔ continuous f
h.to_homeomorph.comp_continuous_iff'
lemma
isometry_equiv.comp_continuous_iff'
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "continuous", "topological_space" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
coe_one : ⇑(1 : α ≃ᵢ α) = id
rfl
lemma
isometry_equiv.coe_one
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
coe_mul (e₁ e₂ : α ≃ᵢ α) : ⇑(e₁ * e₂) = e₁ ∘ e₂
rfl
lemma
isometry_equiv.coe_mul
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
mul_apply (e₁ e₂ : α ≃ᵢ α) (x : α) : (e₁ * e₂) x = e₁ (e₂ x)
rfl
lemma
isometry_equiv.mul_apply
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
inv_apply_self (e : α ≃ᵢ α) (x: α) : e⁻¹ (e x) = x
e.symm_apply_apply x
lemma
isometry_equiv.inv_apply_self
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
apply_inv_self (e : α ≃ᵢ α) (x: α) : e (e⁻¹ x) = x
e.apply_symm_apply x
lemma
isometry_equiv.apply_inv_self
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
complete_space [complete_space β] (e : α ≃ᵢ β) : complete_space α
complete_space_of_is_complete_univ $ is_complete_of_complete_image e.isometry.uniform_inducing $ by rwa [set.image_univ, isometry_equiv.range_eq_univ, ← complete_space_iff_is_complete_univ]
lemma
isometry_equiv.complete_space
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "complete_space", "complete_space_iff_is_complete_univ", "complete_space_of_is_complete_univ", "is_complete_of_complete_image", "isometry_equiv.range_eq_univ", "set.image_univ" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
complete_space_iff (e : α ≃ᵢ β) : complete_space α ↔ complete_space β
by { split; introI H, exacts [e.symm.complete_space, e.complete_space] }
lemma
isometry_equiv.complete_space_iff
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "complete_space" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
fun_unique [unique ι] [fintype ι] : (ι → α) ≃ᵢ α
{ to_equiv := equiv.fun_unique ι α, isometry_to_fun := λ x hx, by simp [edist_pi_def, finset.univ_unique, finset.sup_singleton] }
def
isometry_equiv.fun_unique
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "edist_pi_def", "equiv.fun_unique", "finset.sup_singleton", "finset.univ_unique", "fintype", "unique" ]
`equiv.fun_unique` as an `isometry_equiv`.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
pi_fin_two (α : fin 2 → Type*) [Π i, pseudo_emetric_space (α i)] : (Π i, α i) ≃ᵢ α 0 × α 1
{ to_equiv := pi_fin_two_equiv α, isometry_to_fun := λ x hx, by simp [edist_pi_def, fin.univ_succ, prod.edist_eq] }
def
isometry_equiv.pi_fin_two
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "edist_pi_def", "fin.univ_succ", "pi_fin_two_equiv", "prod.edist_eq", "pseudo_emetric_space" ]
`pi_fin_two_equiv` as an `isometry_equiv`.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
diam_image (s : set α) : metric.diam (h '' s) = metric.diam s
h.isometry.diam_image s
lemma
isometry_equiv.diam_image
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "metric.diam" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
diam_preimage (s : set β) : metric.diam (h ⁻¹' s) = metric.diam s
by rw [← image_symm, diam_image]
lemma
isometry_equiv.diam_preimage
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "metric.diam" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
diam_univ : metric.diam (univ : set α) = metric.diam (univ : set β)
congr_arg ennreal.to_real h.ediam_univ
lemma
isometry_equiv.diam_univ
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "ennreal.to_real", "metric.diam" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_ball (h : α ≃ᵢ β) (x : β) (r : ℝ) : h ⁻¹' (metric.ball x r) = metric.ball (h.symm x) r
by rw [← h.isometry.preimage_ball (h.symm x) r, h.apply_symm_apply]
lemma
isometry_equiv.preimage_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "metric.ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_sphere (h : α ≃ᵢ β) (x : β) (r : ℝ) : h ⁻¹' (metric.sphere x r) = metric.sphere (h.symm x) r
by rw [← h.isometry.preimage_sphere (h.symm x) r, h.apply_symm_apply]
lemma
isometry_equiv.preimage_sphere
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "metric.sphere" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
preimage_closed_ball (h : α ≃ᵢ β) (x : β) (r : ℝ) : h ⁻¹' (metric.closed_ball x r) = metric.closed_ball (h.symm x) r
by rw [← h.isometry.preimage_closed_ball (h.symm x) r, h.apply_symm_apply]
lemma
isometry_equiv.preimage_closed_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "metric.closed_ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
image_ball (h : α ≃ᵢ β) (x : α) (r : ℝ) : h '' (metric.ball x r) = metric.ball (h x) r
by rw [← h.preimage_symm, h.symm.preimage_ball, symm_symm]
lemma
isometry_equiv.image_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "metric.ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
image_sphere (h : α ≃ᵢ β) (x : α) (r : ℝ) : h '' (metric.sphere x r) = metric.sphere (h x) r
by rw [← h.preimage_symm, h.symm.preimage_sphere, symm_symm]
lemma
isometry_equiv.image_sphere
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "metric.sphere" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
image_closed_ball (h : α ≃ᵢ β) (x : α) (r : ℝ) : h '' (metric.closed_ball x r) = metric.closed_ball (h x) r
by rw [← h.preimage_symm, h.symm.preimage_closed_ball, symm_symm]
lemma
isometry_equiv.image_closed_ball
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "metric.closed_ball" ]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
isometry.isometry_equiv_on_range [emetric_space α] [pseudo_emetric_space β] {f : α → β} (h : isometry f) : α ≃ᵢ range f
{ isometry_to_fun := λx y, by simpa [subtype.edist_eq] using h x y, to_equiv := equiv.of_injective f h.injective }
def
isometry.isometry_equiv_on_range
topology.metric_space
src/topology/metric_space/isometry.lean
[ "topology.metric_space.antilipschitz" ]
[ "emetric_space", "equiv.of_injective", "isometry", "pseudo_emetric_space", "subtype.edist_eq" ]
An isometry induces an isometric isomorphism between the source space and the range of the isometry.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
embedding_of_subset : ℓ_infty_ℝ
⟨ λ n, dist a (x n) - dist (x 0) (x n), begin apply mem_ℓp_infty, use dist a (x 0), rintros - ⟨n, rfl⟩, exact abs_dist_sub_le _ _ _ end ⟩
def
Kuratowski_embedding.embedding_of_subset
topology.metric_space
src/topology/metric_space/kuratowski.lean
[ "analysis.normed_space.lp_space", "topology.sets.compacts" ]
[ "abs_dist_sub_le", "mem_ℓp_infty" ]
A metric space can be embedded in `l^∞(ℝ)` via the distances to points in a fixed countable set, if this set is dense. This map is given in `Kuratowski_embedding`, without density assumptions.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
embedding_of_subset_coe : embedding_of_subset x a n = dist a (x n) - dist (x 0) (x n)
rfl
lemma
Kuratowski_embedding.embedding_of_subset_coe
topology.metric_space
src/topology/metric_space/kuratowski.lean
[ "analysis.normed_space.lp_space", "topology.sets.compacts" ]
[]
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
embedding_of_subset_dist_le (a b : α) : dist (embedding_of_subset x a) (embedding_of_subset x b) ≤ dist a b
begin refine lp.norm_le_of_forall_le dist_nonneg (λn, _), simp only [lp.coe_fn_sub, pi.sub_apply, embedding_of_subset_coe, real.dist_eq], convert abs_dist_sub_le a b (x n) using 2, ring end
lemma
Kuratowski_embedding.embedding_of_subset_dist_le
topology.metric_space
src/topology/metric_space/kuratowski.lean
[ "analysis.normed_space.lp_space", "topology.sets.compacts" ]
[ "abs_dist_sub_le", "dist_nonneg", "lp.coe_fn_sub", "lp.norm_le_of_forall_le", "real.dist_eq", "ring" ]
The embedding map is always a semi-contraction.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
embedding_of_subset_isometry (H : dense_range x) : isometry (embedding_of_subset x)
begin refine isometry.of_dist_eq (λa b, _), refine (embedding_of_subset_dist_le x a b).antisymm (le_of_forall_pos_le_add (λe epos, _)), /- First step: find n with dist a (x n) < e -/ rcases metric.mem_closure_range_iff.1 (H a) (e/2) (half_pos epos) with ⟨n, hn⟩, /- Second step: use the norm control at index n...
lemma
Kuratowski_embedding.embedding_of_subset_isometry
topology.metric_space
src/topology/metric_space/kuratowski.lean
[ "analysis.normed_space.lp_space", "topology.sets.compacts" ]
[ "dense_range", "dist_comm", "dist_triangle", "ennreal.top_ne_zero", "half_pos", "isometry", "le_abs_self", "lp.norm_apply_le_norm", "mul_le_mul_of_nonneg_left", "ring" ]
When the reference set is dense, the embedding map is an isometry on its image.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
exists_isometric_embedding (α : Type u) [metric_space α] [separable_space α] : ∃(f : α → ℓ_infty_ℝ), isometry f
begin cases (univ : set α).eq_empty_or_nonempty with h h, { use (λ_, 0), assume x, exact absurd h (nonempty.ne_empty ⟨x, mem_univ x⟩) }, { /- We construct a map x : ℕ → α with dense image -/ rcases h with ⟨basepoint⟩, haveI : inhabited α := ⟨basepoint⟩, have : ∃s:set α, s.countable ∧ dense s := exists...
theorem
Kuratowski_embedding.exists_isometric_embedding
topology.metric_space
src/topology/metric_space/kuratowski.lean
[ "analysis.normed_space.lp_space", "topology.sets.compacts" ]
[ "dense", "isometry", "metric_space" ]
Every separable metric space embeds isometrically in `ℓ_infty_ℝ`.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
Kuratowski_embedding (α : Type u) [metric_space α] [separable_space α] : α → ℓ_infty_ℝ
classical.some (Kuratowski_embedding.exists_isometric_embedding α)
def
Kuratowski_embedding
topology.metric_space
src/topology/metric_space/kuratowski.lean
[ "analysis.normed_space.lp_space", "topology.sets.compacts" ]
[ "Kuratowski_embedding.exists_isometric_embedding", "metric_space" ]
The Kuratowski embedding is an isometric embedding of a separable metric space in `ℓ^∞(ℝ)`.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
Kuratowski_embedding.isometry (α : Type u) [metric_space α] [separable_space α] : isometry (Kuratowski_embedding α)
classical.some_spec (exists_isometric_embedding α)
lemma
Kuratowski_embedding.isometry
topology.metric_space
src/topology/metric_space/kuratowski.lean
[ "analysis.normed_space.lp_space", "topology.sets.compacts" ]
[ "Kuratowski_embedding", "isometry", "metric_space" ]
The Kuratowski embedding is an isometry.
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
nonempty_compacts.Kuratowski_embedding (α : Type u) [metric_space α] [compact_space α] [nonempty α] : nonempty_compacts ℓ_infty_ℝ
{ carrier := range (Kuratowski_embedding α), is_compact' := is_compact_range (Kuratowski_embedding.isometry α).continuous, nonempty' := range_nonempty _ }
def
nonempty_compacts.Kuratowski_embedding
topology.metric_space
src/topology/metric_space/kuratowski.lean
[ "analysis.normed_space.lp_space", "topology.sets.compacts" ]
[ "Kuratowski_embedding", "Kuratowski_embedding.isometry", "compact_space", "continuous", "is_compact_range", "metric_space" ]
Version of the Kuratowski embedding for nonempty compacts
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83
lipschitz_with [pseudo_emetric_space α] [pseudo_emetric_space β] (K : ℝ≥0) (f : α → β)
∀x y, edist (f x) (f y) ≤ K * edist x y
def
lipschitz_with
topology.metric_space
src/topology/metric_space/lipschitz.lean
[ "logic.function.iterate", "data.set.intervals.proj_Icc", "topology.algebra.order.field", "topology.metric_space.basic", "topology.bornology.hom" ]
[ "pseudo_emetric_space" ]
A function `f` is Lipschitz continuous with constant `K ≥ 0` if for all `x, y` we have `dist (f x) (f y) ≤ K * dist x y`
https://github.com/leanprover-community/mathlib
65a1391a0106c9204fe45bc73a039f056558cb83