text stringlengths 1 1.11k | source dict |
|---|---|
for the Regents Math - Algebra, Geometry, Measurement, Probability, Statistics, Trigonometry. Print Proof by Contradiction: Definition & Examples Worksheet 1. The next group of rules deals with the Boolean connectives contradiction. Once a mathematical statement has been proved with a rigorous argument, it counts as tr... | {
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quantum-gate, programming, pytket
Title: How to define a custom gate from a matrix in TKET I'm currently learning all about different quantum tools such as qiskit, tket, cirq, Forest SDK and so on. I just want to create a circuit that gets executed given a matrix, because a circuit can be written as a matrix and the o... | {
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"tags": "quantum-gate, programming, pytket",
"url": null
} |
c++, object-oriented, classes
if (row > 0 && col < 6 && board[row-1][col+2] == 3)return true;
if (row > 1 && col < 7 && board[row-2][col+1] == 3)return true;
if (row < 7 && col < 6 && board[row+1][col+2] == 3)return true;
if (row < 6 && col < 7 && board[row+2][col+1] == ... | {
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CONIC DEFINITION AND WHAT WASN’T OBVIOUS TO ME
A parabola is the locus of points equidistant from a given point (focus) and line (directrix).
What makes the parabola interesting, in my opinion, is the interplay between the distance from a line (always perpendicular to some point C on the directrix) and the focus poi... | {
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Method 1$\frac 12$ (Same as above but waves hands over doing tso cases).
$S = average*\text{number of terms} = average*n$.
Now the average of $1$ and $n$ is $\frac {n+1}2$ and the average of $2$ and $n-1$ is $\frac {n+1}2$ and so on. So the average of all of them together is $\frac {n+1}2$. So $S = \frac {n+1}2n$.
M... | {
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quantum-mechanics, differential-geometry, wavefunction, mathematical-physics, topology
According to this lecture https://www.youtube.com/watch?v=C93KzJ7-Es4&t=1630s one can address this issue by interpreting the wave function $\Psi$ no longer as a function $f_\Psi:\mathbb{R^2}→ \mathbb{C}$ but as a section $\Psi:\math... | {
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"tags": "quantum-mechanics, differential-geometry, wavefunction, mathematical-physics, topo... |
electromagnetism, electric-current
The arbitrary choice of current direction is simply this argument in the special case where $\alpha=-1$. You must switch the sign of all the voltage definitions together withyour currents.
Actually equations of state that survive multiplication by $-1$ are more general than simply li... | {
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quantum-mechanics, operators, hilbert-space, dirac-delta-distributions, matrix-elements
&=\frac{\partial^2 f(x,0)}{\partial x^2}\bigg{|}_{x=0}-\int_{-\infty}^\infty dx \frac{\partial^2}{\partial x^{2}}[f(x,x) \delta(x)]\\
&=\frac{\partial^2 f(x,0)}{\partial x^2}\bigg{|}_{x=0}.
\end{align} The last term went to zero ... | {
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ros, function
Originally posted by chao on ROS Answers with karma: 153 on 2013-12-19
Post score: 0
Original comments
Comment by VC on 2013-12-19:
Could you post the error messages please?
Comment by chao on 2013-12-19:
hi VC, my apologies. the error message was "error: ‘publishBbox’ was not declared in this scope". h... | {
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ros
Title: Dynamic Recongure callback seems to happen spontaneously
I know that's imposible. Help me spot my mistake. I think I am just launching the camera (raspicam_node) and suddenly out of nowhere comes a dynamic reconfigure. I was playing with that before but now to troubleshoot as far as I can tell, everything ... | {
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ros-melodic, boost, roscpp
/usr/include/boost/function/function_template.hpp:159:11: error: no match for call to ‘(boost::_bi::bind_t<boost::_bi::unspecified, boost::_bi::bind_t<boost::_bi::unspecified, void (myClass::*)(boost::shared_ptr<const vision_msgs::Detection2DArray_<std::allocator<void> > >&, boost::shared_pt... | {
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"tags": "ros-melodic, boost, roscpp",
"url": null
} |
increases in current linearly as a ramp as a function of time when the voltage across it is constant. You can use this calculator to compute the RMS voltage value in three simple steps: Input the peak voltage. There are several ways that can be represented. Mathematics is definitely among the top fears of students acro... | {
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"openwebmath_score": 0.6861895322799683,
"tags"... |
= 1/3 * base * height. Cone and Cylinder Challenge Problems Quiz: Volume Word Problems 1. Solved problems on volume of cones In this lesson you will find typical solved problems on volume of cones. Examples Explained Problems; Home > Pre-algebra > Volume > Volume Of A Cone > Worksheets Volume Of A Cone Worksheet 2. Vol... | {
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"lm_q1_score": 0.9927672370524974,
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"lm_q2_score": 0.8152324983301568,
"openwebmath_perplexity": 583.2908903722966,
"openwebmath_score": 0.6182653903961182,
... |
terminology, asymptotics, landau-notation, reference-question
Another situation in which it makes sense to use big O and big Omega is when it is hard to find the exact asymptotics of a function. Take as an example the central binomial coefficient $\binom{2n}{n}$. Since $\sum_{m=0}^{2n} \binom{2n}{m} = 4^n$ and since
$... | {
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"tags": "terminology, asymptotics, landau-notation, reference-question",
"url": null
} |
filters, filter-design, finite-impulse-response, infinite-impulse-response, poles-zeros
A similar thing holds for FIR filters. Causal FIR filters indeed have all their poles at the origin, but non-causal FIR filters also have poles at infinity. A simple example is this non-causal moving average filter
$$H(z)=\frac15\l... | {
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• You should include to your question why you think that it's true,so you can have precise answers. – Nameless Nov 2 '15 at 20:38
• Be specific about the title, that will facilitate finding this post to other users while searching. – user249332 Nov 2 '15 at 20:39
• $3$ balls are drawn from $6+5=11$ balls, so no. of way... | {
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"ta... |
the-sun, stellar-atmospheres, photosphere
and links to the solar-center.stanford.edu page The Sun's Vital Statistics for the $1 \times 10^{-6} \text{ kg/m}^{-3}.$ Converting the units, this is only $1 \times 10^{-9} \text{ g/cm}^{-3}.$
Question: Is it possible to clear up this disparity, and to see a plot of the densi... | {
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"tags": "the-sun, stellar-atmospheres, photosphere",
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Get this solution in a later section contains derivatives, either ordinary derivatives in it have! Initial conditions required will depend on whether or not you ’ ve got or... Equation simply is the function into the differential equation is just the mystery function for... We use to describe the world around us deriva... | {
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"openwebmath_perplexity": 525.7848162114726,
"openwebmath_score": 0.703813374042511,
"tags": null... |
Common Core HSF. Once they’ve figured out the parent function ( SPOILER: it’s quadratic. The Graph of the Complex Exponential Function Fold Unfold. Edulastic Extravaganza Contest! Hello All, As you may or may not know, I am a member of the Edulastic Innovator Team. Practice and discussion are required to understand mat... | {
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"lm_q1_score": 0.9808759610129464,
"lm_q1q2_score": 0.8195057193758364,
"lm_q2_score": 0.8354835391516133,
"openwebmath_perplexity": 1118.105188233274,
"openwebmath_score": 0.35644984245300293,
"... |
botany, plant-anatomy
Monocots have a distinctive arrangement of vascular tissue known as an
atactostele in which the vascular tissue is scattered rather than
arranged in concentric rings. Many monocots are herbaceous and do not
have the ability to increase the width of a stem (secondary growth)
via the same k... | {
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"tags": "botany, plant-anatomy",
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} |
homework-and-exercises, lagrangian-formalism, gauge-theory, variational-principle, yang-mills
Attempt: Since the space of gauge potentials is an affine space we may consider the variations $\mathcal A + t\mathcal B$ (family of 1-parameter of gauge potentials) thus
$$\begin{aligned}\frac{d}{dt} \Big(\mathcal {YM}(\math... | {
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Find an online tutor now choose an expert and meet online. You can start by using the trig identity of sin2x1. Would the taylor series based on the same approach converge. Apr 02, 2018 this calculus 2 video tutorial explains how to find the taylor series and the maclaurin series of a function using a simple formula. Su... | {
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"openwebmath_score": 0.9050303101539612,
"tags": null,... |
logic, sequential-circuit
Title: D flip flop : How does it work in depth I'm coming to you today because I have some trouble to understand how works D flip flop in depth. Two weeks ago we started at school learning sequential logic and so register and everything that come with. We saw how to build a D flip flop using ... | {
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"tags": "logic, sequential-circuit",
"url": null
} |
energy-conservation, capacitance
Title: Where extra stored energy of Capacitor go ? Suppose We have a capacitor with capacitance $\ C $ and charge $\ Q $ . So total stored energy is $$ E=\frac{Q^2}{2C} $$ Now if I connect a capacitor with same capacitance parallel with it then current will flow until voltage across b... | {
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"tags": "energy-conservation, capacitance",
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} |
feature-selection, text-mining, feature-extraction
Example: in a text classification task, there are 1000 documents and a vocabulary of 20000 unique words as candidate features. Using all the words would certainly cause overfitting, so we decide to use only 100 words as features. We can calculate the conditional entro... | {
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homework-and-exercises, thermodynamics, energy, laser
But let's assume 1 minute with 1 W laser (as in your question), and emissivity of 0.03 (polished copper). Then the total heat absorbed by the copper is 1.8 J. The specific heat capacity of copper is roughly 0.4 J/g/C. If the sheet of copper is 1 mm thick, and circu... | {
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"tags": "homework-and-exercises, thermodynamics, energy, laser",
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java, game
System.out.println("It was a great game!!");
break;
}
else if(p4_val>100)
{
System.out.println("You rolled more than you require to reach 100!!");
System.out.println("You can't... | {
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} |
planet, temperature, mathematics
As requested, here are some example calculations. First off, the sanity check: Earth. Taking 1361 W/m2 as the value of the solar constant and using an albedo of 0.3 and an emissivity of 1, the temperature works out as
$$T_{\mathrm{eq}} = \left[\frac{1361\ \mathrm{W\!\cdot\!m^{-2}\,\tim... | {
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"tags": "planet, temperature, mathematics",
"url": null
} |
bigdata, dataset, data-wrangling
Title: Tools to perform SQL analytics on 350TB of csv data In short, what would be the best method/tricks/techniques/tools for performing ad hoc sql (style) queries on 350TB of csv data? Would there be other options, tool wise that would do it faster if we dropped the "sql" requirement... | {
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"tags": "bigdata, dataset, data-wrangling",
"url": null
} |
algorithms, graphs, search-algorithms
If we impose the restriction that $h(n)=0$ if $n$ is a goal state, then it is easy to see that consistency implies admissibility.
These properties guarantee that the algorithm is sound, complete and optimal for tree-search (admissibility) and graph-search (consistency).
Now, there... | {
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rviz, turtlebot2, turtlebot, costmap, obstacle-avoidance
I then send a goal about 10 feet forward in rviz, and while the robot is moving forward, press the bumper with my foot so that the Kinect does not see me.
My costmap files for gmapping are as follows:
costmap_common_params.yaml:
origin_z: 0.0
z_resolution: .1
z_... | {
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A point is said to be as an X and Y value of a Cartesian coordinate on a grid. We have the final answer as. To find the area under a slope you need to integrate the equation and subtract the lower bound of the area from the upper bound. Finding the Slope of a Line from the Graph, Finding the Slope of a Line from Two Po... | {
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"openwebmath_score": 0.7160261869430542,
... |
• Comment too casual for an answer. Your intermediate steps with rounding along the way lead to errors that propagate. You need more precision than you chose from the start to get the final precision you want. Just how much more is a serious question. People have studied this. – Ethan Bolker Aug 25 '19 at 18:14
• $0.99... | {
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"openwebmath_score": 0.6502864956855774,
... |
machine-learning-model, data-science-model, cross-validation, hyperparameter-tuning
Is this right and a necessary step? What is the right way to read this result? Do I compare it to the roc_auc score from the cross-validation/baseline model that was executed above?
I'd be happy to clarify any misunderstanding so that ... | {
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fluid-dynamics, friction, vibrations, viscosity
Title: How does one mathematically derive the damping coefficient of a theoretical viscous dashpot? I am very well aware of how to get the damping coefficient experimentally by observing a system in action.
Given the dimensions and fluid properties of a theoretical visco... | {
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"tags": "fluid-dynamics, friction, vibrations, viscosity",
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ros-melodic, ubuntu, ubuntu-bionic
Note that the use of relative paths can lead to some unexpected behaviour if you're not careful. See #q235337 for some related Q&As.
Originally posted by gvdhoorn with karma: 86574 on 2019-08-22
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment b... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros-melodic, ubuntu, ubuntu-bionic",
"url": null
} |
automated-theorem-proving, proof-assistants, mathematical-programming, coq
(* Natural numbers *)
Inductive N:Set :=
zero: N | succ : N -> N.
Print N.
Print N_rect.
Definition R
(C:N -> Set)
(d: C zero)
(e: (forall x:N, C x -> C (succ x))):
(forall n:N, C n) :=
fix F (n: N): C n :=
match n as n0 return ... | {
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"openwebmath_score": null,
"tags": "automated-theorem-proving, proof-assistants, mathematical-programming, coq",
"url": nu... |
c++, reinventing-the-wheel
MySharedPtr& operator=(const MySharedPtr& other) {
return copyAssignment(other);
}
template<typename U>
requires derived_from<remove_cvref_t<U>,remove_cvref_t<T>>
MySharedPtr& operator=(const MySharedPtr<U>& other) {
return copyAssignment(other);
}
~MySharedPtr() {
if (cb) ... | {
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"tags": "c++, reinventing-the-wheel",
"url": null
} |
u-net, batch-normalization, adam, mini-batch-gradient-descent, semantic-segmentation
How could this be explained? If it is due to the internal covariate shift, the Adam models without BN should not improve either, right?
In the image below is the binary CE (BCE) train loss of my three models where the basic U-Net is b... | {
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"tags": "u-net, batch-normalization, adam, mini-batch-gradient-descent, semantic-segmentation",
... |
probability
Q1) What is the probability that the tourist is at least 3 city blocks (as
the crow flies) from Broadway and Broadway after 10 moves?
Q2) What is the probability that the tourist is at least 10 city blocks
(as the crow flies) from Broadway and Broadway after 60 moves?
Q3) What is the probability that the t... | {
"domain": "datascience.stackexchange",
"id": 498,
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"tags": "probability",
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} |
the correct answer below. That's just perfect. For the covariance or correlation matrix, the eigenvectors correspond to principal components and the eigenvalues to … acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus ... | {
"domain": "levonline.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9334308110294983,
"lm_q1q2_score": 0.819063866407941,
"lm_q2_score": 0.8774767842777551,
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"openwebmath_score": 0.8160443902015686,
"tag... |
This might no longer look strange when you consider that from a geometric point of view, inverting a function is just flippes its graph on the $45^°$-line (i.e. the graph of the function $f(x)=x$).
Now look at the graph of $1/x$, which is perfectly symmetric to this line. No wonder that its inverse is the same. You wi... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9740426405416754,
"lm_q1q2_score": 0.8030610717939112,
"lm_q2_score": 0.8244619263765706,
"openwebmath_perplexity": 282.636705115182,
"openwebmath_score": 0.4918317198753357,
"... |
quantum-gate, quantum-state, terminology-and-notation
$$|x\rangle = |+\rangle = \frac{1}{\sqrt2} (|0\rangle + |1\rangle)$$
$$|y\rangle = |-\rangle = \frac{1}{\sqrt 2} (|0\rangle - |1\rangle)$$
Then the CNOT operation will result in:
$$|+-\rangle \to |--\rangle$$
This means that $|x\rangle$ changed from $|+\rangle$ to ... | {
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"tags": "quantum-gate, quantum-state, terminology-and-notation",
"url": null
} |
java, tree, console, library, ascii-art
for (String line : lines) {
maximumLineLength = Math.max(maximumLineLength, line.length());
}
return maximumLineLength;
}
private void printCorners(TextSprite textSprite) {
int width = textSprite.getWidth();
int height = text... | {
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"tags": "java, tree, console, library, ascii-art",
"url": null
} |
density, inertia, moment
Clearly, the MMOI of a tube is a linear interpolation of the two extreme values with the interpolation parameter $\lambda$ the ratio of areas between the hollow center and the overall area.
So to think of MMOI intuitively think about how is the mass distributed around the center and how close ... | {
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"id": 84348,
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"openwebmath_score": null,
"tags": "density, inertia, moment",
"url": null
} |
is the covariance of and . Suppose X is an n x k matrix holding ordered sets of raw data. . I am a beginner in Linear Algerbra. The covariance Using the visualization of the covariance matrix, feature selection was used to reduced the original dimension from 6 to 4. (aka, a covariance matrix). a53 The number of unique ... | {
"domain": "kpi.ua",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9465966702001758,
"lm_q1q2_score": 0.8007662961755292,
"lm_q2_score": 0.845942439250491,
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"openwebmath_score": 0.5929288864135742,
"tags": null,
... |
quantum-field-theory, group-theory, group-representations
$$| \psi \rangle = \alpha | k, 1 \rangle + \beta | k, 2 \rangle + \gamma | k, 3 \rangle$$
so you can see already that if these states are a representation, whatever that means, it's sure going to be a three dimensional one, because the space of one particle sta... | {
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"tags": "quantum-field-theory, group-theory, group-representations",
"url": null
} |
quantum-mechanics, wavefunction, atomic-physics, fermions, identical-particles
Title: Helium two particle system of identical particles
The equations [5.27]-[5.31] is a description of a two particle system (one electron, each in a hydrogenic atom). The assumption seems to be that these electrons are distinguishable (... | {
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"tags": "quantum-mechanics, wavefunction, atomic-physics, fermions, identical-particles",
... |
computational-chemistry, molecular-mechanics
For Lennard-Jones you would need to use mixing rules for the oxygen (there is no LJ parameters for the hydrogens)
$$\sigma_{(o-N_a)} = \frac{\sigma_o + \sigma_{N_a}}{2}$$
and
$$\epsilon_{(o-N_a)} = \sqrt{\epsilon_o \epsilon_{Na}}$$
then do the standard LJ calculation for ... | {
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"id": 11480,
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"tags": "computational-chemistry, molecular-mechanics",
"url": null
} |
DAG). shortest path in DAG. Topological Sorting for a graph is not possible if the graph is not a DAG. First, find a list of "start nodes" which have no incoming edges and insert them into a set S; at least one such node must exist in a non-empty acyclic graph. In maven build system , we provide dependencies of differe... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9643214460461698,
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"lm_q2_score": 0.837619961306541,
"openwebmath_perplexity": 1399.052146630165,
"openwebmath_score": 0.21160000562667847,
"tags":... |
experimental-physics, vacuum, experimental-technique
you will need clean gloves and work bench (layered with aluminum foil).
The point to use a sonicator is to remove all the gunk in the hard-to-reach places, like the inside of threads. You can't use just acetone, since while it is great at removing grease, it sticks ... | {
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"tags": "experimental-physics, vacuum, experimental-technique",
"url": null
} |
Multiplication If A, B, And C Are M X N Matrices, And C And D Are Scalars, Then The Properties Below Are True. A B _____ Commutative property of addition 2. Unlike matrix addition, the properties of multiplication of real numbers do not all generalize to matrices. Let A, B, and C be three matrices. 8. det A = 0 exactly... | {
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"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9914225156000334,
"lm_q1q2_score": 0.9457834668207633,
"lm_q2_score": 0.9539660961284018,
"openwebmath_perplexity": 360.7558924577382,
"openwebmath_score": 0.7671064734458923,
"tags"... |
4. I understand why the equation has infinitely many solutions geometrically:
Because what the equation asserts geometrically is to find the projection of b, denoted by p, in the column space of A, then solve the new equation $A\hat x$ = p. Because we can always project b onto the column space of A, whether it's singul... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9802808690122163,
"lm_q1q2_score": 0.8059762732249508,
"lm_q2_score": 0.8221891283434877,
"openwebmath_perplexity": 132.65190930483058,
"openwebmath_score": 0.8730255365371704,
"ta... |
c#
public string GetString(string prompt)
{
Console.Write(prompt);
return Console.ReadLine();
}
}
internal class Menu
{
public ProgramState CurrentState { get; private set; }
public Menu(ProgramState state)
{
CurrentState = state... | {
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"tags": "c#",
"url": null
} |
optics, experimental-physics, photons, electric-circuits, noise
In the continuous mode for a single trace you will see a continuous photocurrent which has fluctuations. In the single photon mode you will see a stream of pulses with fluctuating spacings in time.
In the continuous mode shot noise is manifested as a vari... | {
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"tags": "optics, experimental-physics, photons, electric-circuits, noise",
"url": null
} |
navigation, ros-melodic, move-base
My move_base_params:
shutdown_costmaps: false
controller_frequency: 10.0
planner_patience: 5.0
controller_patience: 15.0
conservative_reset_dist: 3.0
planner_frequency: 5.0
oscillation_timeout: 10.0
oscillation_distance: 0.2
And finally my dwa_local_planner_params :
DWAPlannerRO... | {
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"tags": "navigation, ros-melodic, move-base",
"url": null
} |
c++, state-machine, sfml, entity-component-system, pong
void clear(const sf::Color& color = {0, 0, 0, 255}) {
sfml_window.clear(color);
};
template <typename... Args>
void draw(Args&&... args) {
sfml_window.draw(std::forward <Args> (args)...);
};
void display() {
s... | {
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"tags": "c++, state-machine, sfml, entity-component-system, pong",
"url": null
} |
turing-machines, decision-problem, semi-decidability
This is, are there words, w, in a decidable language for which cannot be determined a bound f(|w|)? Consider a Turing machine which reads its input and then immediately stops. This Turing machine always halts on every input, but the running time is unbounded: the ma... | {
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"tags": "turing-machines, decision-problem, semi-decidability",
"url": null
} |
proteins, mass-spectrometry, mass-spec, proteomics
Which peak do I have to look at when determining the charge based on the isotope distribution?
Why would the peaks differ 0.5 mass units (see above)?
update
source: http://mascot.proteomix.org/help/mass_accuracy_help.html
When looking at the above graph, there is a... | {
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"tags": "proteins, mass-spectrometry, mass-spec, proteomics",
"url": null
} |
quantum-mechanics
Title: er= epr vs. string theory to reconcile quantum mechanics and general relativity The ER= EPR Theory posited by Juan Maldacena is a formulation of a way to show quantum mechanics and general relativity can coexist together since these two seemingly different concepts one from QM and the other fr... | {
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"tags": "quantum-mechanics",
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} |
recurrence-relation
$$T(n) = \Theta( n \log \log n )$$
Now with this being said; I believe this issue in your logic is the following steps:
$$
\begin{align}
T(n) & \leq cn \log{\log {\frac{n}{2}}} + \frac{n}{\log n}\\
& \leq cn \log{\log {n}} + \frac{n}{\log n}
\end{align}
$$
The jump from step 1 to step 2, while not ... | {
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"tags": "recurrence-relation",
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} |
c++, beginner, object-oriented, game
twov = 0;
}
if(threev == 1){
randoml = 0;
randoml = rand() % 20 + 1;
three1 = three1 + randoml;
cout << "You had a recruit visiting and you won! The recruit's liking of your school has increased by " << randoml << endl;
threev = 0;
}
if(fourv == 1){
randoml ... | {
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"tags": "c++, beginner, object-oriented, game",
"url": null
} |
meteorology, weather-forecasting, solar-terrestrial-physics
The moon does not normally affect weather much, but during a solar eclipse, there is reduced solar radiation reaching the surface of the Earth. This causes cooler temperatures and changes in wind speed/direction than would not otherwise be predicted. The N... | {
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"tags": "meteorology, weather-forecasting, solar-terrestrial-physics",
"url": null
} |
python, numpy
def _sample_surface_grid(self):
na, nb = 40, 40
aa, bb = np.meshgrid(np.linspace(self.a.min(), self.a.max(), na),
np.linspace(self.b.min(), self.b.max(), nb))
self.aa = aa
self.bb = bb
def noisify_array(one_dim_array, randomness_multiplier):
... | {
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} |
java, console, socket, stream, server
// Restore stderr
System.setErr(defaultStderr);
}
note that this handling of System.err is a problem.... you will never be able to multi-thread until you fix this.
All the best, I hope this makes sense to you. | {
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} |
complexity-theory, np-complete, complexity-classes, relativization, np
This is more or less everything what I know about relativization, I will appreciate if someonw would decide to share his/her thoughts on the topic. | {
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"tags": "complexity-theory, np-complete, complexity-classes, relativization, np",
"url": null
} |
graphs, optimization, weighted-graphs, hamiltonian-path
In this paper, the authors identified three different variants of the TVS. They originally addressed the case where vertices can be repeated but edges cannot be traversed twice.
That's not the case you are interested in! The specific case of simple paths was addr... | {
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"tags": "graphs, optimization, weighted-graphs, hamiltonian-path",
"url": null
} |
ros, roscpp, best-practices, publisher
So as the answers suggest, this question is really about the best way to solve the scenario above.
EDIT 2 I changed the name of the question for your searching convenience. | {
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algorithms, optimization, dynamic-programming
I'd like to know also if there is a way for solving it with a different recurrence with a variable only, or why if it is not possible. Before proving a lower bound you have to formalize your computational model. This can be done in several ways for dynamic programming. The... | {
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"tags": "algorithms, optimization, dynamic-programming",
"url": null
} |
ros, python3, archlinux, package, ros-indigo
So would it really be wise to move to Python 3 for Indigo on Arch Linux? Or is that clearly too soon if even Debian/Ubuntu stick with Python 2 for now anyway? I already upgraded the script we use to generate our PKGBUILDs to work with both versions, so this is just a matter... | {
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"tags": "ros, python3, archlinux, package, ros-indigo",
"url": null
} |
homework-and-exercises, classical-mechanics, collision, moment
Title: Initial velocities of a collision This is the question:
A car of mass 900 kg and a van of mass 1300 kg collide at a crossroads.
Investigation into the collision discloses that the car was travelling south east and
that the van was travelling due n... | {
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"tags": "homework-and-exercises, classical-mechanics, collision, moment",
"url": null
} |
css
or
padding: 5px; I'm afraid that there's no 'good' answer here. There are many ways to achieve a certain effect, but they are dependent on the context.
Floated containers differ from the ones that are positioned absolutely. An absolutely positioned container is 'taken out of the layout' - that means e.g. that if y... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "css",
"url": null
} |
matlab, fft, autocorrelation, power-spectral-density
Here are the figures: You are right that the DFT of a real and even sequence is real and even. The problem is that your sequence is not even, at least not the way you programmed it. The fft command doesn't know how you defined the index m. By definition, the first ... | {
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"tags": "matlab, fft, autocorrelation, power-spectral-density",
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} |
swift, optional
@IBAction func startButtonPressed(_ sender: UIButton) {
guard let numberOfRooms = selectedRooms.text, !numberOfRooms.isEmpty else {
return selectedRooms.placeholder = "type it, dude"
} //if user typed something
let rooms = Int(numberOfRooms)
x = Int(ceil... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "swift, optional",
"url": null
} |
c++, c++11, database
size_t max_width_idx(std::vector<size_t> idxes, std::string(*field)(const Contact&) ) const {
size_t max = 0;
for (auto& idx : idxes) {
auto str = field(list.contacts[idx]);
max = std::max(str.length(), max);
}
return max;
}
/* Print... | {
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"tags": "c++, c++11, database",
"url": null
} |
javascript, html, css, calculator
1https://codereview.stackexchange.com/a/215201/120114
2https://www.sitepoint.com/community/t/getelementbyid-vs-queryselector/280663/2 | {
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"tags": "javascript, html, css, calculator",
"url": null
} |
python, algorithm, python-3.x, programming-challenge, dynamic-programming
The solution passes 58/80 test cases, but for some reason, the solution is returning a Time Limit Exceeded exception on an input array with hundreds of elements. I implemented a dynamic programming solution using a 1d array to memoize previous s... | {
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"tags": "python, algorithm, python-3.x, programming-challenge, dynamic-programming",
"... |
of the solid is , and the surface area is. Then it will consider composite areas made up of such shapes. Calculating the centroid involves only the geometrical shape of the area. Informally, it is the "average" of all points of. Given a closed curve with area A, perimeter P and centroid { }, and a line external to the ... | {
"domain": "sagemis.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9925393563153742,
"lm_q1q2_score": 0.8183109097123348,
"lm_q2_score": 0.8244619263765706,
"openwebmath_perplexity": 579.7803577963642,
"openwebmath_score": 0.7817797064781189,
"tags": nul... |
# Finding The Nth Term Of A Geometric Sequence Examples | {
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"lm_q1_score": 0.9920620051945144,
"lm_q1q2_score": 0.8087611825397049,
"lm_q2_score": 0.8152324938410784,
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"tags": n... |
Proof.
Apply Lemma 2 repeatedly. Lemma 1 ensures that the injection always avoids $$312312$$.
For the other direction, we need to be slightly more careful.
Lemma 3.
If $$WW$$ contains a pattern $$312312$$ in which $$33$$ doesn't correspond to $$W(1)W(1)$$ then $$N(W)N(W)$$ contains a pattern $$312312$$.
Proof.
The p... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9896718450437034,
"lm_q1q2_score": 0.8159467515768083,
"lm_q2_score": 0.8244619220634457,
"openwebmath_perplexity": 290.7909389377915,
"openwebmath_score": 0.9809901118278503,
"tag... |
python, python-3.x, recursion, error-handling, minesweeper
self.user_row = int(self.user_cell[2:])
self.user_column = int(self.user_cell[:2])
if self.user_cell:
self.user_reveal.append(self.user_cell)
return self.user_cell,self.user_row,self.user_column
def mines_generator(self... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, recursion, error-handling, minesweeper",
"url": null
} |
particle-physics, strong-force, isospin-symmetry
Now I do not really understand why or how the mass depends on the strong interaction or vice versa. From Griffiths it seems, that the reason why isospin is not a good symmetry for higher mass differences is, that only "apart from the mass differences" strong interaction... | {
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"openwebmath_score": null,
"tags": "particle-physics, strong-force, isospin-symmetry",
"url": null
} |
thermodynamics, adiabatic, reversibility
Title: How is this process not quasi-static yet reversible? Consider a (adiabatic) canister with a piston containing some gas kept in a vacuum. There are two weights on the canister which equalize the pressure of the gas on the piston. Assume the system is at equilibrium.
I re... | {
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"tags": "thermodynamics, adiabatic, reversibility",
"url": null
} |
We conclude
$$D_uf(p)=g'(0)=\nabla f(p)u$$
(You don't need the dot product in this expression, if you interpret $\nabla f$ correctly as a row vector.)
As for the intuitive idea, the point is that in the infinitesimal limit (which is what derivatives measure), a differentiable function is well-approximated by a linea... | {
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"lm_q1q2_score": 0.8058050024636156,
"lm_q2_score": 0.8244619177503205,
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"openwebmath_score": 0.7434623837471008,
"ta... |
$$\displaystyle u+v = \dfrac{25}{16}$$
$$\displaystyle u-v = \dfrac{25}{32}$$
Solve that system to find points that are on the lemniscate AND have horizontal tangent.
Last edited:
#### soroban
##### Elite Member
Hello, sarahjohnson!
Find the points on the lemniscate where the tangent is horizontal.
. . $$\display... | {
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"openwebmath_score": 0.851535439491272,
"tags... |
energy, potential
having the satellite decrease its height above earth should decrease its potential energy.
The earth-satellite system has less potential potential energy when they are closer together.
However, if all other possible potential energies are factored in, that's probably not what happens).
There is ... | {
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"openwebmath_score": null,
"tags": "energy, potential",
"url": null
} |
c#, performance, sql, file-system
command.ExecuteNonQuery();
}
}
}
static void LogError(Guid id, string prevLocation, string newLocation, string msg, int number)
{
if (newLocation == null)
{
newLocation = "no new location";
... | {
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"openwebmath_score": null,
"tags": "c#, performance, sql, file-system",
"url": null
} |
quantum-mechanics, photons, atomic-physics, quantum-electrodynamics
Eventually I want to understand the concept of the reflection. How we see the objects, why they are transparent or glossy or red or whatever else. But this is out of scope of my question.
I'm not an expert though; so mark down the mistakes above if th... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, photons, atomic-physics, quantum-electrodynamics",
"url": nul... |
kinematics
Title: Can an object reverse its direction of acceleration even though it continues to move in the same direction? Can anyone please explain me on this matter along with day to day examples? A pendulum is a day to day example of this. If you watch a pendulum swinging from left to right as it passes the mid ... | {
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"tags": "kinematics",
"url": null
} |
organic-chemistry, carbonyl-compounds, carboxylic-acids
I suspect possible intervention of the lone pair from the $\ce{-CN}$ group to form an aromatic ring. Does it (or something else) happen or not? @Waylander's suggestion that 3-cyanophthalide [3-oxo-1,3-dihydroisobenzofuran-1-carbonitrile] 6 is expected as the prod... | {
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"id": 16578,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "organic-chemistry, carbonyl-compounds, carboxylic-acids",
"url": null
} |
ros
Comment by joq on 2014-06-30:
I agree that the docs should not assume everyone knowns CMake well. If you can suggest where information should be added, I will make the update. Here, perhaps? http://docs.ros.org/api/catkin/html/howto/format2/cpp_msg_dependencies.html ?
Comment by joq on 2014-06-30:
It's also mentio... | {
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"tags": "ros",
"url": null
} |
quantum-mechanics, quantum-field-theory, particle-physics, antimatter
Title: Annihilation of pairs $e^{+}$ and $e^{-}$ and photon production In the annihilation of pairs $e^{+}$ and $e^{-}$, two gamma photons are formed. Is the reverse process, ie, if we collide two photons, will they form an electron and positron? ... | {
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"id": 33135,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, quantum-field-theory, particle-physics, antimatter",
"url": n... |
quantum-mechanics, quantum-entanglement, universe
You might imagine that in the instant following measurement, a quantum system has collapsed into a single definitive state, which would imply the complete absence of entanglement. However this only works if you can be exactly 100% confident in the measurement outcome. ... | {
"domain": "physics.stackexchange",
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"tags": "quantum-mechanics, quantum-entanglement, universe",
"url": null
} |
4. The identity function is, of course, both onto and one-to-one. This is a perfectly valid example.
Now, as you can see a function can independently be one-to-one or not and onto or not. It is not true that, in general, onto implies one-to-one and neither it is, on the contrary, that one-to-one implies onto.
• Very ... | {
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"lm_q2_score": 0.8459424373085146,
"openwebmath_perplexity": 251.67836112120824,
"openwebmath_score": 0.809454619884491,
"tag... |
quantum-mechanics, heisenberg-uncertainty-principle
Edit: Here's another way to put it that is more tightly focused to this question. Within the classical model of an electron gas (the Drude model), electrons behave like particles within an ideal gas. Therefore, their velocity (and by extension their momentum) distrib... | {
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"tags": "quantum-mechanics, heisenberg-uncertainty-principle",
"url": null
} |
inorganic-chemistry, oxidation-state
Next up you have ligands which are poor σ donors and pretty good π acceptors. Carbon monoxide falls into this category: it is not really all that good a σ donor and backbonding is often required for a stable $\ce{M-L}$ bond to be formed (for some exceptions, google "non-classical c... | {
"domain": "chemistry.stackexchange",
"id": 9490,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "inorganic-chemistry, oxidation-state",
"url": null
} |
mechanical-engineering, fluid-mechanics, thermodynamics, compressors, turbomachinery
Method 3 ignores that this is a flow process and therefore winds up with change in internal energy (hence use of $c_v$). Multiply the answer by $\gamma = 1.4$, so $c_p$ instead of $c_v$, to get enthalpy change and you are back to Meth... | {
"domain": "engineering.stackexchange",
"id": 5235,
"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": "mechanical-engineering, fluid-mechanics, thermodynamics, compressors, turbomach... |
python, python-2.x, functional-programming, regex, plugin
Title: Voting plugin for an IRC bot MetaBrainz has an IRC channel called #metabrainz on which there's a bot called BrainzBot running. It provides utilities such as linking to JIRA issues or Github PRs automatically when they're mentioned. Recently, I came up wi... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-2.x, functional-programming, regex, plugin",
"url": null
} |
# Complex root of equation 1 [closed]
let $$a,b$$ & $$c$$ are the roots of cubic $$x^3-3x^2+1=0$$
Find a cubic whose roots are $$\frac a{a-2},\frac b{b-2}$$ and $$\frac c{c-2}$$
hence or otherwise find value of $$(a-2)(b-2)(c-2)$$
• Since $p(x)=(x-a)(x-b)(x-c)$ you simply have $(a-2)(b-2)(c-2)=-p(2)=3$. – Jack D'Au... | {
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"lm_q1_score": 0.9770226254066618,
"lm_q1q2_score": 0.8010543460572741,
"lm_q2_score": 0.8198933425148213,
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"openwebmath_score": 0.9284040927886963,
"tag... |
diffraction, photon-emission
Thus - does the diffracted electron radiate photons? I believe the answers given so far are off the mark and do not directly answer the OP's question: do diffracted electrons emit bremsstrahlung radiation/soft photons?
So I give the answer here: The answer is a resounding yes!
However s... | {
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"openwebmath_score": null,
"tags": "diffraction, photon-emission",
"url": null
} |
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