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7. Aug 8, 2005
### J1618
(x+y) + xy = C
C is known & both x,y,c are even numbers.Whether is it possible to find x & y from this equation? How many posiible x & y in that equation?
y = -2 is the only special case
x – 2 – 2x =c
-x = c + 2
x = -c – 2
Find all even c such that x is even.
c = 2n for all integer n.
Thus, ... | {
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electric-circuits, electric-current, electrical-resistance, voltage
$$
{\bf V} = V_0e^{j\omega t^{\prime}}\,, \quad {\bf I} = I_0e^{j(\omega t^{\prime} - \theta)}\,.
$$
In these expressions involving the time variable $t^{\prime}$ one can drop the prime on the $t^{\prime}$ if one so wishes.
Taking the ratio of ${\bf ... | {
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"url": nul... |
python, python-3.x, web-scraping
Union[Odds, None] is the same as Optional[Odds], which is slightly more descriptive, IMO.
You should use a requests.Session to make consecutive requests to the same server faster.
The authentication method is not very secure, although at least the password is not transmitted unencryp... | {
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Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bh... | {
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"openwebmath_score": 0.6382226347923279,
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# De Morgan's Laws (Set Theory)/Set Complement/Complement of Intersection
## Theorem
Let $T_1, T_2$ be subsets of a universe $\mathbb U$.
Then:
$\overline {T_1 \cap T_2} = \overline T_1 \cup \overline T_2$
where $\overline T_1$ is the set complement of $T_1$.
It is arguable that this notation may be easier to fol... | {
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octomap, ubuntu-oneiric, ubuntu
Comment by Chong on 2012-06-04:
I see. Thanks. One more question: if I use the non-ros version of octovis, is it still possible to view the colored map? Cuz when i use that to open the filename.bt, i can only see the depth map with no colors
Comment by AHornung on 2012-06-04:
Yes, any r... | {
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statistical-mechanics, phase-transition, simulations, topological-phase, polymers
There are quite a few enhanced sampling methods and here I am going to list the ones which I think could help you the most (not in any particular order): | {
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In the context of linear algebra one wants to restrict attention to functions that are linear. A linear and bijective function would have a linear-algebra inverse, by definition, if it has an inverse function that is also linear.
Theorem: A linear function that has an inverse function, has a linear inverse function.
... | {
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"openwebmath_score": 0.813147783279419,
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quantum-mechanics, hamiltonian, second-quantization
What happened to other values such as: The indices are generically unrestricted. In typical ab initio quantum chemistry approaches, one truncates the Fock space up to some finite number $ N $ of spin orbitals. Then all of $ p,q,r,s $ can range from $ 1 $ to $ N $.
Th... | {
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# Thread: Antiderivative(s) of a function
1. ## Antiderivative(s) of a function
Can a function have more than one different antiderivative? I keep getting different answers on some exercises and it drives me crazy, i double-checked my solving method and it's correct, yet i'm getting a different result.
2. All integr... | {
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To find the moment of inertia of the entire section, we integrate the above expression and get, Iyy = ΣdAx2, Ixx = ΣdAy2 and Izz = ΣdAz2. The moment of inertia integral is an integral over the mass distribution. Tension Members. Polar moment of inertia is equal to the sum of inertia about X-axis and Y-axis. Mass = m an... | {
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"openwebmath_score": 0.6235755681991577,
"tags... |
We know a couple of facts:
1. If a sequence $(s_n)_{n\geq1}$ converges then we have that
$\displaystyle\qquad\liminf_{n\to\infty} s_n = \lim_{n\to\infty} s_n = \limsup_{n\to\infty} s_n$.
2. There is a summable series $\sum_{n=1}^\infty a_n$ with non-negative $a_n$ such that $\limsup\limits_{n\to\infty} na_n > 0$.
Ta... | {
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"openwebmath_score": 0.9271830320358276,
"ta... |
reaction-mechanism, equilibrium, color
Taking heat out of the equilibrium will push it to the right
Putting heat in, will push it to the left
Increasing pressure will push it to the right
As we shift the equilibrium we change the concentration of the components, and consequently the color of the gaseous mixture.
Ba... | {
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"tags": "reaction-mechanism, equilibrium, color",
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} |
temperature, units, definition, metrology
Title: How do Temperature Scales work? How exactly do temperature scales work?
If my understanding is correct, the Celsius scale has two fixed points: (definitions of temperature irrespective of scale)
1. The freezing point of pure water at 1atm (labelled 0 C)
2. The boiling... | {
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general-relativity, gravity, mass, potential-energy
P.S: Actually, instead of velocity addition formula, one can check Earth's motion in $xy$ plane from S's point of view with time dilation formula, That's, Earth orbits the Sun every $365$day from Sun's point of view, So from S's perspective it should take $\gamma_u 3... | {
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ros
Original comments
Comment by dornhege on 2013-09-23:
Technically there is not guarantee that you will receive all messages. That being said: In your setting you'd hope for that given the large queue sizes. One guess: Check, which messages are missing. Are those the first ones? Then those are sent before the topic ... | {
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quantum-field-theory, renormalization, effective-field-theory, locality, non-locality
Title: Locality of interactions and their high energy behavior In a classic Georgi review of EFT, I have read the following quote | {
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entomology, parasitology, parasitism
During a blood meal, a malaria-infected mosquito injects sporozoites in its saliva into the human host (1). Sporozoites travel through the circulatory system and first infect hepatocytes (liver cells) (2, stage A) and mature into schizonts (3), which rupture and release merozoites ... | {
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"tags": "entomology, parasitology, parasitism",
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ros, arduino#ros#raspberry
Originally posted by suforeman with karma: 300 on 2017-01-11
This answer was ACCEPTED on the original site
Post score: 2 | {
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You can compute the CDF using delta-functions. Express the PMF as follows, $$p(x) = (0.4) \delta(x-1) + (0.3) \delta(x-2) + (0.2) \delta(x-3) + (0.1) \delta(x-4)$$ The CDF is then given by integration, by definition, if $$P(x)$$ is the CDF then, $$P(x) = \int_{-\infty}^x p(y) ~ dy$$ Observe that if $$x<1$$ then each of... | {
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"openwebmath_score": 0.7038476467132568,
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ubuntu-lucid, ros-fuerte, rosinstall, ubuntu
Title: Can not install rosinstall because of python version conflict
Hello,
I'm having troubles installing ROS fuerte on Ubuntu Lucid. I did the installation accordign to the standard installation instructions for fuerte on lucid.
But when installing rosinstall (sudo apt-g... | {
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quantum-field-theory, electrons, charge
The photon field appears in quantum electrodynamics or QED, which is our quantum field theoretic description of the electromagnetic force. The photon mediates the electromagnetic force between charged fields.
I must stress though that the photon doesn't interact with itself. Th... | {
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java, game, swing, pong
PongPanel class:
Here my attention first turned to the actionPerformed, keyPressed, keyReleased and keyTyped methods, as they are all missing an @Override annotation. It's really recommendable to use one, because then you know right away that the method signature is enforced elsewhere. Interfac... | {
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-
For comparison with other sources, note Mathematica gives the Jacobi theta functions in terms of the nome $q$ rather than the half-period ratio $\tau$. – Semiclassical Aug 9 '14 at 13:55
If truth be told, I'm not an expert in this field of Mathematics, I just plugged the series into Mathematica and this result came u... | {
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logic, arithmetic, propositional-logic, relational-calculus
$A$
$B$
$C$
$A \Leftrightarrow (B \Leftrightarrow C)$
1
1
1
1
0
1
1
0
1
0
1
0
0
0
1
1
1
1
0
0
0
1
0
1
1
0
0
1
0
0
0
0
So is either one of theses forms the right one or am i all wrong ? The symbol $\Leftrightarrow$ is generaly defined as a binary oper... | {
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r, genomics, gsea
pathwaysReordered <- lapply(pathwaysFiltered, function(x) ranksOrderInv[x])
gseaStatRes <- do.call(rbind,
lapply(pathwaysReordered, calcGseaStat,
stats=stats,
returnLeadingEdge=TRUE))
I found a proble... | {
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quantum-mechanics, operators, observables, foundations
For example, suppose the state of the system is $\rho$ and you want the probability that a detector $\Delta\in\Sigma$ fires. The desired probability is just $p=tr[\rho\sigma(\Delta)]$.
What the heck does this have to do with Self-Adjoint operators?
Are you ready f... | {
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ros, transform, ros-kinetic, tf2
static tf2_ros::TransformBroadcaster tf2_broadcaster;
geometry_msgs::TransformStamped transformStamped;
transformStamped.header.stamp = ros::Time::now();
transformStamped.header.frame_id = "ts_frame";
transformStamped.child_frame_id = "prism_frame";
transformStamped.transfor... | {
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organic-chemistry, orbitals, hyperconjugation
The structure on the right can be actually written 3 times since there are 3 hydrogens available. Note also that the "ethylenic-like" structure on the right involves a $\mathrm{sp^3-p}$ bond (the $\ce{C-H}$ bond is $\mathrm{sp^3}$ hybridized and the cationic carbon has a $... | {
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"tags": "organic-chemistry, orbitals, hyperconjugation",
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} |
mechanism, torque, gearing
Regarding your additional question about how to secure the bearing: attaching a shaft and bearing can be a challenge. Often a press is used if they are smaller components. For large items the bearing is often heated, and, less commonly in my experience, the shaft may be cooled in dry ice. ... | {
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"tags": "mechanism, torque, gearing",
"url": null
} |
physiology, theoretical-biology, respiration
Pilbeams Mechanical Ventilation
Nunn's Applied Respiratory Physiology
Guyton and Hall Medical Physiology There is no known mechanism for exchange of $\ce{O2}$ and $\ce{CO2}$ in a one-for-one fashion. Their transport across the alveolar membrane takes place by diffusion alon... | {
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navigation, gps, robot-pose-ekf
Comment by Ryan on 2013-02-03:
In the meantime, we've submitted a patch to robot_pose_ekf which we believe is well tested. Just adding some more tests now. @Chad, @Johannes, please get in touch if you need us. We are well set up for test hardware.
As part of ROS Answers cleanup week: M... | {
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"tags": "navigation, gps, robot-pose-ekf",
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c++, algorithm, programming-challenge
After second update list will be:
100 200 100 100 100
After third update list will be:
100 200 200 200 100
So the required answer will be: 200
Final solution
I changed the way of storing the values, which now get indexed into a map. I think now it's efficient in time and space,... | {
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image-processing, filters, fourier-transform, deconvolution, inverse-problem
This inverse-filtering problem is very similar to equalization in communications systems, where this phenomenon is referred to as noise enhancement. In that context, the inverse-filter approach is referred to as a zero-forcing equalizer, whic... | {
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"url": n... |
definition is - a scalar associated with a given linear transformation of a vector space and having the property that there is some nonzero vector which when multiplied by the scalar is equal to the vector obtained by letting the transformation operate on the vector; especially : a root of the characteristic equation o... | {
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"openwebmath_score": 0.8620264530181885,
"ta... |
to be dependent. Suppose that. Now we will discuss independent events and conditional probability. Since, the two events A and B holds the condition, we can say that A and B are independent events. Let B be the event that the first die is a 3, 4, or 5. For instance, when we roll two dice, the outcome of each is an inde... | {
"domain": "chiavellainox.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9835969679646668,
"lm_q1q2_score": 0.8340585122931772,
"lm_q2_score": 0.8479677545357568,
"openwebmath_perplexity": 380.949029133403,
"openwebmath_score": 0.6175912022590637,
"t... |
python, performance, python-2.x
direcToData = os.listdir("/FullData/RowData")
for loop in direcToData:
mydir2=os.listdir("/FullData/RowData/"+loop)
for i in mydir2:
if myloop:
with open("/FullData/RowData/"+loop+"/"+i) as source_file:
# chunk the ... | {
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"tags": "python, performance, python-2.x",
"url": null
} |
quantum-gravity, gravitational-waves, carrier-particles
The rank-2 tensor in 4 dimensions admits 16 free variables. Is this the case for a graviton -- all 16 free variables are admitted, no restriction on the freedom?
It must be symmetric which leaves 10 degrees of freedom.
8 degrees of freedom are fixed by gauge tra... | {
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"tags": "quantum-gravity, gravitational-waves, carrier-particles",
"url": null
} |
electromagnetism, special-relativity
Title: Magnetic field around a current carrying wire and Special Theory of Relativity I understand how the magnetic field and electric field (around a current-carrying conductor) swap their roles depending on the frame of reference, due to the effect of length contraction (in the s... | {
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"tags": "electromagnetism, special-relativity",
"url": null
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python, python-3.x, game
def create_user(username,password,coins,items):
csv_file = CSV(file_path)
data = csv_file.read()
data.append([username,password,coins,*items])
csv_file.write(data)
return True
def retrieve_user_data(ID):
users_csv = CSV(file_path)
row = users_csv.read()[ID]
use... | {
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} |
physical-chemistry, quantum-chemistry
\begin{equation}
\int\limits_{-b}^{3b} | \psi (x) |^2 \,\mathrm dx = \int\limits_{-b}^{3b} | A |^2 \,\mathrm dx = 1
\end{equation}
The antiderivative of a constant $C$ is the product of this constant with the integration variable, e.g. $x C$.
So
\begin{align}
\int\limits_{-b}^{3b}... | {
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"tags": "physical-chemistry, quantum-chemistry",
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} |
nuclear-physics, quantum-spin, tensor-calculus, isospin-symmetry
Applying this to your problem, then, it asks you to compose an isosinglet $ \Lambda_c^+$ with an isotriplet $\pi^0 $, whose isospin you are indeed assumed to know, as you surmised. Appreciating one of the quarks of both baryons is a c, you are then led t... | {
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"tags": "nuclear-physics, quantum-spin, tensor-calculus, isospin-symmetry",
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complexity-theory, np-hard
All these expressions (and the corresponding DFAs!) are of length polynomial in $n$, and there is a polynomial number of them, so using DFA intersection you can express the fact that $w$ is of the given form.
The actual $w$ is more complicated, but the idea is the same. At the very end of $w... | {
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This will help you see how all three terms ( three monomials ) with different is! Consider making your next Amazon purchase using our Affiliate Link, the independent term, is the,! The technique used to factor a quadratic expression, then n = 2 leading... + 93, 5a-12, and c = 27 while a multinomial is more than three: ... | {
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"openwebmath_score": 0.5485056638717651,
... |
tensorflow
This dataset has about 67% accuracy using softmax, but there is a real-world cost when falsely categorizing a category 1 item as category 0, which is blown way up when mistakenly categorizing many more items as category 0 mistakenly.
I wanted to fix this by making the cost equation penalize false categoriza... | {
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ros
Originally posted by Massbuilder on ROS Answers with karma: 71 on 2013-11-09
Post score: 0
Original comments
Comment by Robocop87 on 2013-11-09:
The code really doesn't change from version to version, the only major update was the shift from rosbuild to catkin. If you are using hydro and the tutorials require pu... | {
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ros, ros-kinetic, topics
can you clarify this a bit? The type of information that you describe is definitely not something that should be stored on the parameter server. It's state info that encodes the state of one of your ..
Comment by gvdhoorn on 2018-03-12:
.. sensors. / actuators. It seems like a textbook example... | {
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be defined as a relationship between two statements/sentences. line in the table. Example, 1. is a tautology. It is represented by and PÂ Q means "P if and only if Q." Showing logical equivalence or inequivalence is easy. The negation of a conjunction (logical AND) of 2 statements is logically equivalent to the disjunc... | {
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"lm_q1q2_score": 0.8086639294153063,
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"openwebmath_score": 0.6304597854614258,
"ta... |
In this infinite list, there exists two numbers with the same reminder when divided by $m$. Their difference is a multiple of $m$.
Therefore $$m| \overline{a_1...a_ka_1...a_ka_1...a_k00...0}=\overline{a_1...a_ka_1...a_ka_1...a_k}\cdot 10^l$$ Since $m$ is relatively prime to $10$ it follows that $$m|\overline{a_1...a_k... | {
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"lm_q1_score": 0.9886682488058381,
"lm_q1q2_score": 0.864172417519144,
"lm_q2_score": 0.87407724336544,
"openwebmath_perplexity": 122.72536817699505,
"openwebmath_score": 0.8284635543823242,
"tags"... |
data, data-formats
Title: Prepare data : many products per row I would like to find how to change my data structure to make it compatible with a ML model, with the following constraints :
A Product is defined by {id, price, continuousVariable1, ..., continuousVariable10}
The training set is train.csv. Each line c... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "data, data-formats",
"url": null
} |
cc.complexity-theory, automata-theory, space-bounded, space-complexity
Title: Quadratic relationship between nondeterministic and deterministic space? Savitch's theorem shows that $\mathrm{NSPACE}(f(n)) \subseteq \mathrm{DSPACE}(f(n)^2)$ for all large enough functions $f$, and proving that this is tight has been an op... | {
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"tags": "cc.complexity-theory, automata-theory, space-bounded, space-complexity",
"url": ... |
python, reinventing-the-wheel, socket, tcp
In case of a send a BlockingIOError is usually a sign that the network interface is used by another thread and that you should wait before sending your data.
Code review
With that in mind, you might have understood that your get_client_msg and send_client_msg are not quite do... | {
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"tags": "python, reinventing-the-wheel, socket, tcp",
"url": null
} |
ros, laserscan, message, time
scan_pub.publish(scan);
++count;
++t;
r.sleep();
}
}
Originally posted by alfa_80 on ROS Answers with karma: 1053 on 2011-12-16
Post score: 0
I you have some dataset you should use the original time as that matches the other data.
Origin... | {
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"openwebmath_score": null,
"tags": "ros, laserscan, message, time",
"url": null
} |
c#, performance, game, .net, winforms
private async void OnCardClick(Card sender)
{
if (sender.IsFlipped || isShowingCards)
{
return;
}
sender.Flip();
if (previousClickedCard == null)
{
previousClickedCard = sender;
}
else
... | {
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"tags": "c#, performance, game, .net, winforms",
"url": null
} |
python, python-3.x, pandas
'FootKey3': 'Footer3',
'FooterKeyG': 'FooterG'},
'groups': {'A': {'A1ValueKey': '4aa',
'A2ValueKey': '4bb',
'A3ValueKey': '4cc'},
'B': {'B1ValueKey': '4dd',
'B2ValueKey': '4ee',
'B3ValueKey': '4f... | {
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"tags": "python, python-3.x, pandas",
"url": null
} |
The function $f(z) = \frac{e^z + 1}{e^z -1}$ has what type of singularity at $z=0$?
1. a removable singularity.
2. a pole.
3. an essential singularity.
4. the residue of $f(z)$ at $z = 0$ is $2$.
I am spending my crucial Ph.D. time in writing this blog to help others to achieve in Mathematics. So please encourage me by... | {
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"openwebmath_score": 0.9749010801315308,... |
quantum-mechanics, operators, hamiltonian-formalism, phase-space, wigner-transform
The integral over $b$ is also trivial, as the integrand only features $b$ in the form $be^{b\dots}$ Hence,
$$-\frac{m\omega^2}{8\pi^2(P-p)^2} \left[ (X-x)((ix^2+4x)-2X)\mathrm{Ei}(ia(X-x)) -\frac{1}{a}e^{ia(X-x)}(i(X-x)+(x^2-i2x)+1) \ri... | {
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"tags": "quantum-mechanics, operators, hamiltonian-formalism, phase-space, wigner-transform... |
Work Study Job Postings, Schoko Bons Halal, Ontology Database Example, Strawberry Fruit Price In Kerala, Factory Kitchen Design, Financial Advisor Logo Images, South Block Meaning, Is Dlf Mall Noida Open Tomorrow, Foreclosures Brenham, Tx, 20 Mil Commercial Vinyl Plank, How Much Is A Car Wash At 7/11, Ryobi P2009 Trimm... | {
"domain": "com.pl",
"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9777138183570424,
"lm_q1q2_score": 0.8844893270671861,
"lm_q2_score": 0.9046505331728752,
"openwebmath_perplexity": 985.6655599754145,
"openwebmath_score": 0.776803195476532,
"tags": null,
... |
website uses cookies to ensure you get the best experience. Since ${{x}^{7}}$ is not a perfect cube, it has to be rewritten as ${{x}^{6+1}}={{({{x}^{2}})}^{3}}\cdot x$. Divide Radical Expressions. Use the quotient rule to divide radical expressions. You can do more than just simplify radical expressions. As long as the... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9719924777713886,
"lm_q1q2_score": 0.8495964911947484,
"lm_q2_score": 0.8740772286044095,
"openwebmath_perplexity": 972.4474741957093,
"openwebmath_score": 0.8463869094848633,
"tags": null,
... |
python, validation, gui, tkinter
It could use a little cleaning up, but you've got some pretty well-designed code here, and a good idea for a helper class to speed along GUI development. | {
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ros
Title: std_msgs / MultiArrayDimention
hi,
i try to convert sonor range to 2D data and i follow this tutorial to do it link text
i found this error:
/home/pi/catkin_ws/src/robot_setup_tf/src/sonarInjector.cpp:5:42: fatal error: std_msgs/MultiArrayDimention.h: No such file or directory
#include "std_msgs/MultiArra... | {
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electromagnetism, special-relativity, electromagnetic-radiation
&= -\frac{1}{4\pi \epsilon_0 c^2} \frac{[\boldsymbol{\hat r} \cdot \ddot{\mathbf{p}}(t_0)]}{r} \boldsymbol{\hat{r}}
\end{align*}
given that $t_0\equiv t - \dfrac{r}{c}$. Why is it that one the second line the dipole moment -- the $p$ function -- gains a... | {
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"tags": "electromagnetism, special-relativity, electromagnetic-radiation",
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} |
ros, gazebo, remote, ros-electric
Originally posted by SL Remy on ROS Answers with karma: 2022 on 2012-06-14
Post score: 0
Ok, so far the only answer that I can fathom and is supported by this blog is that xservers like vnc do not permit "OpenGL calls to the screen" and that virtualGL is the path forward.
And this ot... | {
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"tags": "ros, gazebo, remote, ros-electric",
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So we can write down the probability distribution in closed form. Doing this for $n = 2$ you obtain the expected value 4.472222.
• Notice that, in the limit, $P(X = 6) = 1^n - (\frac{5}{6})^n \rightarrow 1$ as $n \rightarrow \infty$, so this formula also confirms your intuition from your question. – Matthew Drury Oct ... | {
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"openwebmath_score": 0.7629332542419434,
"tags... |
Noy, you also rightly say that $F\times P$ has a bijection to $\mathbb N^2$. As before, I suggest you actually write down this bijection.
Now, you simply need to see if $\mathbb N^2$ is countable, that is:
Does there exist a bijection between $\mathbb N$ and $\mathbb N^2$
To that end, I suggest you look into Cantor'... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9921841109796002,
"lm_q1q2_score": 0.8602591011179391,
"lm_q2_score": 0.8670357563664174,
"openwebmath_perplexity": 105.60574821025583,
"openwebmath_score": 0.943945050239563,
"tag... |
electromagnetism, electrostatics, electric-fields
Title: Electrostatic field and potential At different places, I saw the different signs in the relation of electrostatic field and potential:
$E=-\nabla \phi$ and $E=\nabla \phi$.
I am confusing what situations they are describing. For example, when the field lines poi... | {
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"tags": "electromagnetism, electrostatics, electric-fields",
"url": null
} |
neutron-star, red-giant, thorne-zytkow-object
TZOs have mostly remained theoretical exotica, at least in part because it's very difficult to distinguish them from "ordinary" red supergiants. The main giveaway would be the presence of unusual elements in the atmosphere, produced by the much hotter nuclear reactions hap... | {
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"tags": "neutron-star, red-giant, thorne-zytkow-object",
"url": null
} |
cardiology, digestive-system, blood-pressure
In truth, the mechanism of PhTN is not fully understood.
Normally after a meal, blood supply to the gastrointestinal (GI) tract increases, starting with increased flow through the left gastric and celiac arteries, followed by the mesenteric artery, which is more prolonged.... | {
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"tags": "cardiology, digestive-system, blood-pressure",
"url": null
} |
homework-and-exercises, newtonian-gravity, astrophysics, sun, centrifugal-force
The second part is simple: The author first finds how much of an angle (in degrees) do the Sun itself (or, the radius of it) is seen like from Earth (which is 1 AU far from the Sun). This is the $\theta$ in the last image you linked. Then ... | {
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"tags": "homework-and-exercises, newtonian-gravity, astrophysics, sun, centrifugal-force",
... |
filters, bandpass, moving-average
I couldn't quite understand where this equation (5) was coming from but as soon as you replace the value $n$ with 30 or 80 you get the values of the passband cut-off freequencies 189 mHz and 504 mHz.
When I asked for specifications on how they did it, they send me to a japanese forum ... | {
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"tags": "filters, bandpass, moving-average",
"url": null
} |
complexity-classes, automata-theory, nfa
To do this, you build an automaton $B_i$ with $n+2$ states recognizing $T_i$ and add an initial state that non-deterministically chooses $i$ and jumps into $B_i$ with an $\epsilon$-transition.
$B_i$ has states $q_1, \dots, q_{n+1}$, and $reject$. Initial state is $q_1$. When i... | {
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"openwebmath_score": null,
"tags": "complexity-classes, automata-theory, nfa",
"url": null
} |
special-relativity, speed-of-light, time
Title: Can relative speed be faster than c If there are two spaceships moving away from each other(in opposite directions) at a speed 0.6c, then wouldnt that make the relative speed of one from the other's frame of reference 1.2c? Does this mean that the spacecrafts would disap... | {
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"openwebmath_score": null,
"tags": "special-relativity, speed-of-light, time",
"url": null
} |
polymers, materials
In 'engineering materials terms' the ratio of tensile stress (in MPa) to strain (in mm) within its elastic region is called the 'modulus of elasticity' of the material (aka 'elastic modulus' or 'Young's modulus').
In the case of latex rubber, it has an elastic modulus of about 0.1 GPa.
Natural rubb... | {
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"openwebmath_score": null,
"tags": "polymers, materials",
"url": null
} |
python, python-2.x, formatting, pandas
def get_lines_fast_unstruct(self):
""" lighter version of pandas.DataFrame.to_string()
with no special spacing format"""
df_recs = self.to_records(index=False)
col_titles = [' '.join(list(self))]
col_data = map(lambda rec:' '.join( map(... | {
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"id": 15116,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-2.x, formatting, pandas",
"url": null
} |
# Thread: Solids of Revolution Question
1. ## Solids of Revolution Question
The Problem
The finite region bounded by the curve $y\ =\ e^x\ +\ 1$, the y-axis, and the line $x\ =\ ln\ 2$, is rotated through 360 degrees about the x-axis. Show that the volume of the solid formed is $\frac{\Pi}{2}(7\ +\ ln\ 4)$.
Attempt
... | {
"domain": "mathhelpforum.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9678992905050948,
"lm_q1q2_score": 0.83567613182504,
"lm_q2_score": 0.8633916152464016,
"openwebmath_perplexity": 564.0151522970035,
"openwebmath_score": 0.9428101181983948,
"tags"... |
regular-languages, regular-expressions
Title: Regular expression for a string not containing a set of substrings I'm trying to figure out how to build a regular expression for a language that doesn't contain strings that contain $101$ or $001$. The alphabet is defined as $\{0, 1\}$. I'm stuck on trying to figure out t... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "regular-languages, regular-expressions",
"url": null
} |
java, mvc, swing
@Override
public void actionPerformed(final ActionEvent e) {
final SwingyNote swingyNote = new SwingyNote(addNewNotePanel.getText());
addNewNotePanel.clearText();
allNotesPanel.addNote(swingyNote);
}
}
Nitpicks:
SwingyNoteService
I assume the instance initializer in th... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, mvc, swing",
"url": null
} |
c#, .net, unit-testing, interview-questions, numbers-to-words
These are the unit tests, I'm only including the method names for brevity:
public void Add_DecimalNumber_ReturnDecimal(string number, decimal expected)
public void Add_Integer_ReturnDecimal(string number, decimal expected)
public void Add_NumberWithThousand... | {
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"tags": "c#, .net, unit-testing, interview-questions, numbers-to-words",
"url": null
} |
context-free, pumping-lemma
Title: Use the pumping lemma to prove that the following language is not context free Can anyone help with the following problem ?
Let $B = \{ a^{n}b^{m}c^{m}d^{2n} | n,m ≥ 0 \}$, use the pumping lemma to prove B is not context-free
Thanks in advance. Consider the following Context Free Gra... | {
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"openwebmath_score": null,
"tags": "context-free, pumping-lemma",
"url": null
} |
c#, parsing
public IEnumerable<ParserResult> Parse(string input)
{
var tokens = myTokenizer.Tokenize(input);
foreach (var result in ParseInternal(tokens).Where(r => r != null))
yield return result;
}
private IEnumerable<ParserResult> ParseInternal(Token[] tokens)
{
... | {
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"openwebmath_score": null,
"tags": "c#, parsing",
"url": null
} |
human-biology, food, neurotransmitter, receptor, taste
There are taste receptors on the surface of our tongue which refer to the proteins TAS1R2 and TAS1R3 which, which bind to the “sweet-tasting” molecules.
When the molecules bind to the receptors, they trigger a series of actions which increase the number of positi... | {
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"lm_q1_score": null,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "human-biology, food, neurotransmitter, receptor, taste",
"url": null
} |
## 1 Answer
Your formula is correct. The answer I obtained from R is 0.00881639 which agrees with the book's answer. Seemingly your answer has a typo - missing the 8 in the 2nd significant digit. | {
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"id": null,
"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9893474907307123,
"lm_q1q2_score": 0.815679340197259,
"lm_q2_score": 0.824461928533133,
"openwebmath_perplexity": 381.5505431204738,
"openwebmath_score": 0.7621719837188721,
"tags"... |
First few Square pyramidal numbers are 1, 5, 14, 30, 55, 91, 140, 204, 285, 385, 506, … Geometrically these numbers represent number of spheres to be stacked to form a pyramid with square base. Further Properties of Squares and Triangle Numbers There are infinitely many triangle numbers that are squares, T1 = 1, T8 = 36... | {
"domain": "nauticalsas.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9822876992225168,
"lm_q1q2_score": 0.8098588108753705,
"lm_q2_score": 0.8244619285331332,
"openwebmath_perplexity": 608.7188237523523,
"openwebmath_score": 0.7077962160110474,
"ta... |
performance, r
pred$fourth[i] <- names(pred[which(pred[i,] == max(pred[i,2:13]))])
pred[i,names(pred[which(pred[i,] == max(pred[i,2:13]))])] <- 0
pred$fifth[i] <- names(pred[which(pred[i,] == max(pred[i,2:13]))])
pred[i,names(pred[which(pred[i,] == max(pred[i,2:13]))])] <- 0
}
data_long <- melt(pred, id.va... | {
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, r",
"url": null
} |
geology, geode
Title: Geodes that float in the ocean? What would happen if you threw a geode into the ocean. Would it sink down to a certain altitude based on how hollow the geode is or would it float on top or sink to the bottom?
And could geodes form in the ocean and then break loose and be released into the ocean? ... | {
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"id": 2412,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "geology, geode",
"url": null
} |
python, python-3.x, game-of-life, ascii-art
elif player_input == 'exit':
break
elif player_input == 'F11':
tdl.set_fullscreen(not tdl.get_fullscreen())
pass
elif player_input == '2':
add_turtle(2)
elif player_input == '3':
add_turtle(3)
elif player_input == 'p... | {
"domain": "codereview.stackexchange",
"id": 30888,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, game-of-life, ascii-art",
"url": null
} |
newtonian-mechanics, newtonian-gravity, differential-geometry, gauss-law
Well, if space is the three dimensional Euclidean space then the volume that contains the source is straightforwardly the 3-ball whose center is at the source position and the border $\partial U$ the corresponding 2-sphere.
But if space is a diff... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "newtonian-mechanics, newtonian-gravity, differential-geometry, gauss-law",
"url":... |
time, azimuth
That should be close enough to mean solar time that you wouldn't care for a number of centuries, certainly a century if you're real picky. As for clock time, what sundial disagreements are possible is limited only by the whims of man. The sundial is several hours wrong in West China. Cause they use the z... | {
"domain": "astronomy.stackexchange",
"id": 1778,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "time, azimuth",
"url": null
} |
thermodynamics, molecules
Along your upper path one never meets this line, so one always has a single homgeneous phase without any intrinsic boundary surface. This is also true at almost all points on your lower path - with the exception of the single point where you path meets the coexistence curve.
Upon crossing th... | {
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"id": 5286,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, molecules",
"url": null
} |
ros, perception-pcl
Originally posted by MarkyMark2012 on ROS Answers with karma: 1834 on 2016-03-11
Post score: 0
Okay found the problem - the PCL build takes up over 2Gb of swap space (god knows why) when compiling some parts. So increasing the swap space did the job (Took over 24 hrs on Pi 2).
Also - should anyone... | {
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"openwebmath_score": null,
"tags": "ros, perception-pcl",
"url": null
} |
--10 percent of 20 = (.10)(20) = 2, then
--Add that result back to the original 20, hence 2 + 20 = 22
2. 200 percent greater than 6 means: find 200% of 6 and add that result back to the original 6
--(200% of 6) plus (6) =
--($$\frac{200}{100}$$ x 6) + 6 =
--12 + 6 = 18
If you use multipliers, it's even easier to ... | {
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"id": null,
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"lm_q1_score": 0.959154281754899,
"lm_q1q2_score": 0.8034067665386493,
"lm_q2_score": 0.8376199552262967,
"openwebmath_perplexity": 4410.034611957774,
"openwebmath_score": 0.6946941614151001,
"tags": nu... |
java, multithreading, queue
So the balance here would be whether I risk losing some data or I risk blocking the whole system.
Also, would it make sense to implement the whole StatsManager as Runnable and use ThreadPoolExecutor to spin off wrapping and sending tasks? Could that be more efficient? Would this be thread... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, multithreading, queue",
"url": null
} |
python, beginner, python-3.x, youtube
#Select the stream to download based on the itag
def download_stream():
global file_path
global yt
global res_list
print('The Video has the following streams')
print(*res_list, sep='\n')
while True:
itag = input('Please Enter the Itag of the stream ... | {
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"tags": "python, beginner, python-3.x, youtube",
"url": null
} |
• @EugeneSh. No. It's just a circuit I am using to try and model something 'easily' I know it's some kind of iteration procedure but I can't quite see it. – Q.P. Jan 25 '17 at 20:24 | {
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"lm_q1q2_score": 0.825902510408358,
"lm_q2_score": 0.8459424431344437,
"openwebmath_perplexity": 627.2580746025427,
"openwebmath_score": 0.699560284614563,
"tags"... |
opencv, catkin, ros-indigo
Title: Problems integrating OpenCV with ROS Indigo
I am trying to build a simple program to start working with OpenCV with ROS Indigo; however, whenever I try to build the code (catkin_make) the build fails and returns
" undefined reference to 'cv::imread(cv::String const&, int)' "
and so o... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "opencv, catkin, ros-indigo",
"url": null
} |
|0> is actually a vector, not a matrix. Applying the Hadamard gate (shortly, H) to |0> means computing a matrix vector multiplication:
$$H|0\rangle = \frac{1}{\sqrt{2}} \begin{pmatrix} 1 & 1\\ 1 & -1 \end{pmatrix} \begin{pmatrix} 1 \\ 0 \end{pmatrix} = \frac{1}{\sqrt{2}} \begin{pmatrix} 1 \\ 1 \end{pmatrix} = \frac{|0... | {
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"id": null,
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"lm_q1_score": 0.9702399043329856,
"lm_q1q2_score": 0.8064081492120236,
"lm_q2_score": 0.831143045767024,
"openwebmath_perplexity": 654.7071465934063,
"openwebmath_score": 0.9346667528152466,
"tags... |
atmosphere, clouds, electromagnetism
In organized motion of charged particles that is when there is net movement of charge in a preferential direction, for example a cloud with charged droplets moving under influence of wind one can have net magnetic field. However, here too, if the cloud as whole contains both positi... | {
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"tags": "atmosphere, clouds, electromagnetism",
"url": null
} |
everyday-chemistry, biochemistry
To summarize, the reaction CAN occur, namely at elevated temperatures (>50 °C) and UV-light and in presence of transition metal. Even if the reaction takes place, the amount of benzene formed is either below detection limit, or below limit for drinking water.
For the end user it means,... | {
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"openwebmath_score": null,
"tags": "everyday-chemistry, biochemistry",
"url": null
} |
For more information on the plugging in strategy, see the following blog section: https://magoosh.com/gre/2011/part-i-the-power-of-plugging-in-%E2%80%93-gre-math-techniques/
7. Sakshi September 13, 2016 at 7:11 am #
Hi,
Suppose that |x|<|y+2|0 and xz>0. Which of the following could be true?
Indicate all statements ... | {
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"lm_q1q2_score": 0.8417192497581555,
"lm_q2_score": 0.8499711756575749,
"openwebmath_perplexity": 672.8900447109249,
"openwebmath_score": 0.5672608613967896,
"tags": nu... |
c#, object-oriented, .net, stackexchange, polymorphism
We have a Wrapper<T> model which represents the base result from an SE API request. All responses from the API (as of now) return this Wrapper with the Items field set to strong-types of the data returned. So, we use a generic implementation so we can provide the ... | {
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"tags": "c#, object-oriented, .net, stackexchange, polymorphism",
"url": null
} |
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