text stringlengths 1 1.11k | source dict |
|---|---|
newtonian-mechanics, pressure, fluid-statics
You can write the fact that pressure is transferred undiminished as
$$\frac {F_1}{S_1}=\frac {F_2}{S_2} \tag{1}$$
But you also know that volume does not change. So
$$h_1S_1=h_2S_2 \tag{2}$$
Now multiply both of these equations ($(1)$ and $(2)$) and cancel out common terms (... | {
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"tags": "newtonian-mechanics, pressure, fluid-statics",
"url": null
} |
inorganic-chemistry, stability, halides
Maybe this can be explained by Fajans rules that due to such conditions $\ce{SF6}$ has more covalent character than others and thus is more stable. But if this is the reason, where does "steric" come in here? $\ce{SF6}$ is extremely stable for purely steric reasons, because S is... | {
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"openwebmath_score": null,
"tags": "inorganic-chemistry, stability, halides",
"url": null
} |
tensor-calculus, notation, commutator
Title: What does a left-right arrow in a tensor formula mean? I need help with some some notation I've not seen before.
Is using the left-right arrow in this formula
$$[P^μ,M^{ρσ}]=i\hbar(g^{\mu\sigma}P^\rho-(\rho\leftrightarrow\sigma))$$
equivalent to writing
$$[P^μ,M^{ρσ}]=i\h... | {
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"tags": "tensor-calculus, notation, commutator",
"url": null
} |
c++, memory-management, c++17, pointers
~Identified() { if (inner_identifier) { inner_identifier->identified = nullptr; } }
const T& operator* () const { return *get(); }
T& operator* () { return *get(); }
const T* operator->() const { return get(); }
T* oper... | {
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"tags": "c++, memory-management, c++17, pointers",
"url": null
} |
bond, concentration, ions, ionic-compounds, isotope
While what you suggest is theoretically possible, the thermal motion of water, which must be not much below 273 K, despite freezing point depression, would make separation of isotopes in liquid water unfeasible. It might actually be more energy efficient to use a mas... | {
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"tags": "bond, concentration, ions, ionic-compounds, isotope",
"url": null
} |
homework-and-exercises, work
In steps, without actually giving the answer because this looks very much like a homework question and this isn't a homework-solving website:
STEP 1: recall the formula for the work $W$ done by a constant force $\vec{F}$ along a trajectory $\vec{s}$
$$W=\vec{F}\cdot\vec{s}$$
STEP 2: expres... | {
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"tags": "homework-and-exercises, work",
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} |
crosses the x-axis. Learn more Accept. No. The intent of these problems is for instructors to use them for assignments and having solutions/answers easily available defeats that purpose. problem and check your answer with the step-by-step explanations. When x increases, y increases twice as fast, so we need 2x; When x ... | {
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"lm_q1_score": 0.9817357195106375,
"lm_q1q2_score": 0.8945376670280062,
"lm_q2_score": 0.9111797088058519,
"openwebmath_perplexity": 661.8729807266412,
"openwebmath_score": 0.3519676923751831,
"tags": null,
... |
observational-astronomy, spectroscopy, hubble-telescope, spectrometry, earendel-whl0137-ls
I noticed in the graphic (shown in the screenshot below) which illustrates all the filters used in this study, that while all but one have conventional square-ish bandpass shapes with fairly straight sides and roughly flat tops ... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "observational-astronomy, spectroscopy, hubble-telescope, spectrometry, earendel-w... |
python, pygame, performance
if down==0:
if across<1920:
per=(across/(32/5))
if per>100:
per=100... | {
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"openwebmath_score": null,
"tags": "python, pygame, performance",
"url": null
} |
(Node B). Solution for complexity using recursion tree method. Compute the cost of each level in the tree. Complexity Analysis of Tower Of Hanoi. . It diagrams the tree of recursive calls and the amount of work done at each call. Thus, the number of operations when n==0, T (0), is some constant a. Anyways, let's solve ... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9711290897113961,
"lm_q1q2_score": 0.813437106611248,
"lm_q2_score": 0.8376199572530449,
"openwebmath_perplexity": 399.93653872498925,
"openwebmath_score": 0.7650355696678162,
"tags"... |
a quadratic equations. YouMore Kwenturuan tungkol sa kung paano gawin ang solving quadratic … This entry was posted in MATH and tagged math , math solver , mathway . OBJECTIVES : •Define the interval correctly •Express the Quadratic Inequalities •Solve the Quadratic Inequalities through graphs and interval notation 3. ... | {
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"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9766692366242304,
"lm_q1q2_score": 0.8767513776685052,
"lm_q2_score": 0.8976952941600963,
"openwebmath_perplexity": 614.3550422102876,
"openwebmath_score": 0.6250958442687988,
"tags": ... |
python
Both of these approaches give the same form on the output, but it should be noted that the second approach gives some extra spaces on the end of each line, to make each line equally long. Both approaches also work for input >= 0 (I left out error-handling for input < 0 since you already covered that in your cod... | {
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"tags": "python",
"url": null
} |
c#, meta-programming, rubberduck
_name = DetermineMemberName(declaration);
_icon = Mappings[key];
}
private readonly string _name;
public override string Name { get { return _name; } }
private readonly CodeExplorerItemViewModel _parent;
public override CodeExplorerItemViewModel Parent { g... | {
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"openwebmath_score": null,
"tags": "c#, meta-programming, rubberduck",
"url": null
} |
c++, strings, c++11
// end of pattern reached => match found
if (idxInPattern == patternLength) {
onMatch(pattern, potentialMatch.idx, idx - m_ + 1);
}
}
}
}
if (isShortPatternExist_) {
++idx;
} else {
idx += ... | {
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"tags": "c++, strings, c++11",
"url": null
} |
ros, tutorial, node
[ rosmake ] Built 25 packages with 1 failures.
[ rosmake ] Summary output to directory
[ rosmake... | {
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"tags": "ros, tutorial, node",
"url": null
} |
jointPlot = ContourPlot[jointPDF, {x1, -4, 4}, {x2, -4, 4}, AspectRatio -> 1, ImageSize -> size, Contours -> 15, ContourShading -> None];
marg1Plot = Rotate[Plot[marg1PDF, {x1, -4, 4}, Axes -> False, ImageSize -> size, AspectRatio -> 1/3], -Pi/2];
marg2Plot = Rotate[Plot[marg2PDF, {x2, -4, 4}, Axes -> False, ImageSize ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9390248191350352,
"lm_q1q2_score": 0.8036654719399664,
"lm_q2_score": 0.8558511506439708,
"openwebmath_perplexity": 3824.104989064495,
"openwebmath_score": 0.22516882419586182,
"ta... |
python, clustering, k-means, pca, text-classification
1. Clustering Algorithm
K-Means clustering is a simple and fast algorithm that produces adequate results. It is almost always the first tool that people reach for, but it has some limitations
a) User must choose the number of clusters ahead of running it
b) Data mu... | {
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"tags": "python, clustering, k-means, pca, text-classification",
"url": null
} |
python, beginner
def gameEnd(result):
if(result == 1):
print("\nCongratulations, You Won! Your Cards' Total Sum Is Higher Than The Dealer's.")
return 1
elif(result == 2):
print("\nYou Lost! The Dealer's Cards' Total Sum Is Higher Than Your's.")
return 2
elif(result == 3):
... | {
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"tags": "python, beginner",
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} |
as shown in the picture and draw curve starting from + from right. now if f(x) < 0 consider curve having "-" inside and if f(x) > 0 consider curve having "+" and combined solution will be the final solution. I m sure I have recalled it fully but if you guys find any issue on that do let me know, this is very helpful. D... | {
"domain": "gmatclub.com",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9489172601537141,
"lm_q1q2_score": 0.8027293853868754,
"lm_q2_score": 0.8459424431344437,
"openwebmath_perplexity": 3088.401169821511,
"openwebmath_score": 0.5496760010719299,
"tags... |
python, programming-challenge
# The chosen card(s) would be appeared twice.
# So, pick items in choices whose value(appearance) is 2, and filter
# others.
choices = {k: v for k, v in choices.iteritems() if v == 2}
# Only one choice should exist after filtering.
if len(choices) ... | {
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"lm_name": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, programming-challenge",
"url": null
} |
clifford-group, randomised-benchmarking
et al., Wallman, Merkel et al., and Helsen et al.. IMO, this problem is not really resolved. I think it would be more responsible to see the decay rate as an independent benchmarking quantity which reflects the quality of your gates -- and not connect it to AGF (cf. benchmarks l... | {
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"id": 3832,
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"openwebmath_score": null,
"tags": "clifford-group, randomised-benchmarking",
"url": null
} |
text-classification, offline-reinforcement-learning
You will need to research what is available to you in your chosen language and service (or vice-versa, look for choices that make this part work best for you). There is no one-size-fits-all solution.
In addition, you may want to check what resources you will have ava... | {
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"openwebmath_score": null,
"tags": "text-classification, offline-reinforcement-learning",
"url": null
} |
c#, json, generics, dynamic-programming, .net-core
This makes inline objects much nicer:
dynamic obj = new ExpandoObject();
obj.a = 123;
obj.b = "message";
obj.c = new List<dynamic> { 456, "something", new ExpandoObject() };
obj.d = Dynamic.Object(o =>
{
o.x = 50;
o.y = new List<dynamic> { "a", "b", "c" };
... | {
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"tags": "c#, json, generics, dynamic-programming, .net-core",
"url": null
} |
c#, algorithm, performance, sorting, image
// creates a log
FileStream outputFileStream = new FileStream(copiedOriginal + "log.txt", FileMode.Create, FileAccess.Write);
StreamWriter writer = new StreamWriter(outputFileStream);
// Copy picture files.
foreach (string f in Directory.GetFiles(sourceDir, ... | {
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"tags": "c#, algorithm, performance, sorting, image",
"url": null
} |
c++, algorithm, c++11
struct Transition {
MappedSubstring sub;
Node *tgt;
Transition() : sub(), tgt(nullptr) {}
Transition(MappedSubstring s, Node *t) : sub(s), tgt(t) {}
};
struct Node {
std::unordered_map<C, Transition> g;
Node *suffix_link;
virtual Tr... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, algorithm, c++11",
"url": null
} |
playing-cards, vbscript
This whole select case suit could be replaced with strSuit = chr(suit + 3) with a comment that says something like 'chr(3)-chr(6): ♥ ♦ ♣ ♠. The "SuitNotFound" case is a WTF for me.
Naming-wise, I don't understand how you can name a variable suit (good), another faceValue (good) and then have ho... | {
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"openwebmath_score": null,
"tags": "playing-cards, vbscript",
"url": null
} |
# Exponential Functions are Linearly Independent
## Problem 73
Let $c_1, c_2,\dots, c_n$ be mutually distinct real numbers.
Show that exponential functions
$e^{c_1x}, e^{c_2x}, \dots, e^{c_nx}$ are linearly independent over $\R$.
Contents
## Hint.
1. Consider a linear combination $a_1 e^{c_1 x}+a_2 e^{c_2x}+\cdot... | {
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"lm_q1_score": 0.9822877028521421,
"lm_q1q2_score": 0.8206851983964216,
"lm_q2_score": 0.8354835309589074,
"openwebmath_perplexity": 764.8719034131028,
"openwebmath_score": 0.9672002196311951,
"tags": ... |
probability, large-hadron-collider, scattering-cross-section
Even this doesn't quite give you a probability- it gives you an expected event rate or number of events in a given interval. Of course, if the time interval is sufficiently short that the expected number of events is much less than one, you can treat this ef... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "probability, large-hadron-collider, scattering-cross-section",
"url": null
} |
c#, validation
public class ValidateCarYear : IValidationRule<Car>
{
public bool Validate(Car t)
{
if (t.Years <= 0 || t.Years >= 2)
{
throw new YearInvalidException("Year invalid!");
}
else
{
return true;
}
}
}
Custom exceptions:
pub... | {
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"url": null
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python, programming-challenge, python-2.x, complexity, bioinformatics
Some of your variable names are not in proper snake case (str2num, char2digit_dict).
List memory allocation increases by a power of 2 each time it surpasses capacity, so you really don't have to pre-allocate the memory for it, it's marginal.
You con... | {
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"openwebmath_score": null,
"tags": "python, programming-challenge, python-2.x, complexity, bioinformatics",
"url"... |
terminology
Title: Is "critical pipe" a proper term for a pipe used in a critically important role? My translation:
Internal pipe diameter inspection
This kind of inspection is carried out on a by-order basis using a certified gauge (for sizes 40 mm and above) of the go/no go type, with both sides of the pipe subject... | {
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"openwebmath_score": null,
"tags": "terminology",
"url": null
} |
How do I solve this recurrence equation using substitution?
f(1)=1, and f(n) = f(n-1)+2(n-1)
Using substitution, here are the first few steps: f(n-1) = f((n-1)-1) + 2((n-1)-1)
f(n-1-1) = f((n-1-1)-1-1) + 2((n-1-1)-1-1)
And then eventually I see that f(n+(-1)*2^j) = f(n+(-1)*2^(j+1)) + 2n + 2(-1)*2^(j+1), where j is... | {
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"lm_q1_score": 0.981453433046725,
"lm_q1q2_score": 0.8322408675728529,
"lm_q2_score": 0.8479677583778257,
"openwebmath_perplexity": 881.040824653047,
"openwebmath_score": 0.841377317905426,
"tags":... |
fluid-mechanics, hydraulics, pipelines
Here the total headloss over set of 2 parallel pipes is equal to the headloss of one of them.
But, how do I combine these two equations to retrieve the total headloss over pipes A, B and C? The total headloss through pipes A+C is equal to the headloss through pipes B+C. Therefore... | {
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"tags": "fluid-mechanics, hydraulics, pipelines",
"url": null
} |
The 15C results are not surprising considering it has less precision. It gives a monthly nominal rate of 0.248451700% whereas the 12C gives 0.248451673 and the HP-32Sii and HP-42S both give 0.248451672% (and so does the 50G). The difference in precision in the 15C likely stems from taking the 12th root of the effective... | {
"domain": "hpmuseum.org",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9822876992225169,
"lm_q1q2_score": 0.8831958709917148,
"lm_q2_score": 0.899121379297294,
"openwebmath_perplexity": 5312.962041189941,
"openwebmath_score": 0.4288967549800873,
"tags": nu... |
c, game, sdl
It would be more nice and powerful in this way:
SDL_SetRenderDrawColor(renderer, &LIME);
SDL_GetRenderDrawColor(renderer, &prev);
But that is not your fault. | {
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"openwebmath_score": null,
"tags": "c, game, sdl",
"url": null
} |
c++
Title: Simple Chained Flow I am developing a simple Chained Flow (should I call it by this name?) that uses waterfall as main operation behavior.
Basically we will have a Flow and he will have some dialogs with functions to be executed. So, when you call start on Flow (passing the name of the dialog) some Waterfal... | {
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"tags": "c++",
"url": null
} |
ros, turtlebot, ros-indigo, astra
I'm working my way through the Turtlebot tutorials (http://learn.turtlebot.com/2015/02/01/8/), and I'm currently at the stage where I'm testing the 3D sensor. I'm running into a few problems since the Turtlebot that I purchased came with ROS installed on the laptop, but apparently not... | {
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"tags": "ros, turtlebot, ros-indigo, astra",
"url": null
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# Direct Proof instead of an Indirect Proof: If $B$ is the set of lower bounds of $A$, then $\sup B \in B$
The author proved the following exercise using a proof by contradiction, but I think it can be accomplished using a direct proof, so I was wondering if someone would verify that my argument is sound.
Exercise
S... | {
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"tag... |
correlation, boosting, features
What are your suggestions? When dealing with correlated variables, I always delete them if they are 0.95+ correlated. In your case, 80% is still high but not that extreme. You have mentioned that as the policy count increases, the total premium increases as well. However, is there a pos... | {
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"tags": "correlation, boosting, features",
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} |
python, performance, python-3.x, primes, sieve-of-eratosthenes
for i in range(3, int(n ** 0.5) + 1, 2):
if sieve[i // 2]:
sieve[i * i // 2::i] = False
return [2] + [2 * i + 1 for i, flag in enumerate(sieve) if flag]
m30_wheel.__init__
The m30_wheel is only constructed once, so its performance... | {
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"url": null
... |
navigation, ekf, gps, navsat-transform, robot-localization
Everything circled in red is output upon launching the navsat_transform node. Everything in green is output when I use rosservice call /datum to manually re-set the datum afterwards. I used the exact same latitude/longitude and heading in both cases, yet notic... | {
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"tags": "navigation, ekf, gps, navsat-transform, robot-localization",
"url": null
} |
Divide the subsets of $\{1,2,\dots,9\}$ into complementary pairs. There are $2^8$ such pairs, and exactly one element of each pair has even sum. Thus there are $2^8$ subsets with even sum, and $2^8-1$ if we exclude the empty set.
Remark: Suppose that $1+2+\cdots+n$ is odd. This is the case when $n\equiv 1\pmod{4}$ and... | {
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"tags... |
performance, vba, excel
Title: Function to find the kth match I've created a UDF some time ago and used it pretty often till now in different ways (but mainly to compare a "history" of data like having different filters at the same time). While there is no need to change anything at this state, I'd like get some sugge... | {
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"tags": "performance, vba, excel",
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} |
energy, energy-conservation
Title: When converting one energy form into another will there be always at least two forms of energy resulting when converting one energy form into another will there be always at least two forms of energy resulting.
For example in following circumstances
1.Conversion of electrical energ... | {
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But that is not a problem. Those cases become possible if $$x \ge 0$$. If $$x \ge 0$$ then $$0 \le x \le -R$$ and this is a subcase of $$-R \le x \le R$$ but we have now have that $$-R \le x < 0$$ is impossible.
I think you are confusing "Prove by cases $$X \iff Y$$ with
Prove $$Case 1 \iff Y$$ and $$Case 2 \iff Y$$.... | {
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php, email, laravel, controller
protected function iv_bytes()
{
return openssl_cipher_iv_length($this->method);
}
public function __construct($key = false, $method = false)
{
I would consider it best practice to always have your constructor as the first method within your class. I typically like to arrange all ... | {
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Dy * vv(:,:)
the result is zero in rows 1 and Ny+1. In other words, we want
Dy([1 Ny+1],:) * vv(:,:)
to be a matrix consisting of two rows of zeros. Another way to say that is that
Dy([1 Ny+1],[1 Ny+1]) * vv([1 Ny+1],:)
should be the negative of
Dy([1 Ny+1],2:Ny) * vv(2:Ny,:)
In other words,
vv([1 Ny+1],:) ... | {
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"openwebmath_score": 0.7250790596008301,
"tags": ... |
forces. Challenge Problem Solutions Circular Motion Dynamics can be taken as capably as picked to act. The work of a force acting on a particle as it moves along a displacement is different for different displacements. Bell Work Go Over Last TEST Lesson Level 1- I understand this pretty well 1D Kinematics practice TEST... | {
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"lm_q1_score": 0.9648551556203814,
"lm_q1q2_score": 0.8102216422533263,
"lm_q2_score": 0.8397339616560072,
"openwebmath_perplexity": 1507.9404399834234,
"openwebmath_score": 0.4129481315612793,
"tag... |
Also, since correlation is defined as $$\operatorname{Corr}(X, Y) = \frac{\operatorname{Cov}(X, Y)}{\sqrt{\operatorname{Var}(X) \operatorname{Var}(Y)}},$$ we can see that \begin{aligned} \operatorname{Corr}(X + a, Y + b) &= \frac{\operatorname{Cov}(X + a, Y + b)}{\sqrt{\operatorname{Var}(X + a) \operatorname{Var}(Y + b... | {
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"openwebmath_score": 0.9992414712905884,
"tags... |
python, datetime, gui, pyqt, pyside
class TreeData:
"""Set the data structure to be used for the QTreeViews."""
day = {}
week = {}
month = {}
def __init__(self, name):
self.name = name
self.data = {}
def add_item(self, key, status, item_name, score):
"""
Sets t... | {
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• @AisforAmbition Yes, that is correct. I added a section to my answer to demonstrate that the same things apply to arbitrary precision numbers, by the way. – Mr.Wizard Jun 25 '15 at 13:04
• @AisforAmbition It is my understanding that that is correct. By the way this is a good read: (6169506) – Mr.Wizard Jun 25 '15 at ... | {
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"openwebmath_score": 0.5718547701835632,
"ta... |
ros, bashrc, package
Originally posted by crazymumu with karma: 214 on 2015-06-10
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by Diego on 2015-06-10:
Thank you. Now could you please tell me where should I put the "source devel/setup.bash" code? I saw in the end of the file th... | {
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special-relativity, astrophysics, relativity, doppler-effect
"separation between the lightlike signal-lines" given by $OW=20$
in the receiver frame. ($OW=k(O\lambda_{source}=(2)(10)=20.$).
The point is: the observed-wavelength (separation between
lightlike signal-lines) doesn't directly involve
length-contraction (in... | {
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"tags": "special-relativity, astrophysics, relativity, doppler-effect",
"url": null
} |
GMAT Question of the Day - Daily to your Mailbox; hard ones only
It is currently 22 Feb 2019, 06:25
### GMAT Club Daily Prep
#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customize... | {
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"id": null,
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"tags": null,
"url"... |
It is easy to see by looking at the definition that $f(0)=0$. From this it follows that $f(\alpha_0)=\int_0^{\alpha_0} f'(\alpha)\ d\alpha$, and in particular $$f(1)=\int_0^1 \frac{\log2}{\alpha}\frac{1}{1+\alpha^2}+\frac{\pi}{4}\frac{\alpha}{1+\alpha^2}-\color{red}{\frac{\log(1+\alpha)}{1+\alpha^2}}\ d\alpha$$ which s... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9740426382811477,
"lm_q1q2_score": 0.8743934960287135,
"lm_q2_score": 0.8976952975813453,
"openwebmath_perplexity": 387.41748400112095,
"openwebmath_score": 0.9459965825080872,
"ta... |
visualization, confusion-matrix
It is easy to see where many cases are. However, those are only $26$ classes. If the whole page was used instead of only one column this could probably be 3x as many, but that would still only be $3 \cdot 26 = 78$ classes. Not even close to 369 classes of HASY or 1000 of ImageNet.
See a... | {
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"tags": "visualization, confusion-matrix",
"url": null
} |
Functions in Python Math Module Here is the list of all the functions and attributes defined in math module with a brief explanation of what they do. 100000000000000005551115123126. For example, this quadratic will not be factored, even though the answers are real: q = x^2 - 8x + 8 factor(q). IPython has some powerful ... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9755769063954521,
"lm_q1q2_score": 0.8232845715573548,
"lm_q2_score": 0.8438951005915208,
"openwebmath_perplexity": 889.6016044723806,
"openwebmath_score": 0.4872167706489563,
"tags":... |
php, form
Title: Checking form input data on submit with pure PHP I have some experience with PHP but I have never even try to do this wit pure PHP, but now a friend of mine asked me to help him with this task so I sat down and write some code. What I'm asking is for opinion if this is the right way to do this when yo... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "php, form",
"url": null
} |
electric-circuits
Title: what is the function of Current Source in a circuit? The voltage across current source is due to current itself or due to the circuit within which it is present. To understand this better take the fluid mechanics analogy.Consider a pipe to be a conductor and the pressure across it to be the vo... | {
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"tags": "electric-circuits",
"url": null
} |
Assistant to the Secretary of the Army www.oaa.army.mil 3/23/2018 POC: Eve Roberts @ 703-428-6435 2 Headquarters, Department of The Army Office Symbol Root If you don’t have the time to scan through every detail here, the table below will help you a lot. In general, if you want the Xth root of a number, raise it to the... | {
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"lm_q1_score": 0.9632305318133554,
"lm_q1q2_score": 0.8047632576840449,
"lm_q2_score": 0.8354835432479661,
"openwebmath_perplexity": 1081.7137551575456,
"openwebmath_score": 0.7292835116386414,... |
ros, rosjava, gradle
Title: rosjava gradle compilation loop
trying to compile rosjava using gradle following:
http://docs.rosjava.googlecode.com/hg/rosjava_core/html/building.html
i managed to get to fourth step, when i run: ./gradlew rosjava:install
everything seems to compile good, but once i hit
Building > :rosjav... | {
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"tags": "ros, rosjava, gradle",
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} |
c#, elasticsearch
This should also allow greater flexibility when it comes to defining dynamic search queries as now it is not tightly coupled to the KeywordMultiMatch which in this case would be an implementation concern.
public void SearchDocuments(Query args) {
var filterQuery = args.Filters
.Select(bui... | {
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} |
fluid-dynamics, simulations, differential-equations, navier-stokes
This paper which is one of the most cited in the topic, suggests that this is an unstable method for large $k$, however, I don't see why we do not simple restrict $k$ to the range $0\leq k \leq 1$ given that if k is larger than 1 matter is created out ... | {
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"tags": "fluid-dynamics, simulations, differential-equations, navier-stokes",
"url": null... |
c++, c++11, benchmarking
start = ct.milliseconds();
List list2(list);
end = ct.milliseconds();
cout << "Copy Duration: " << (end - start) << " milliseconds." << endl;
start = ct.milliseconds();
List list3(std::move(list));
end = ct.milliseconds();
cout << "Move Duration: " << (end - star... | {
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"tags": "c++, c++11, benchmarking",
"url": null
} |
machine-learning, classification, regression, recommender-system, scoring
A next step from there might be to add cross-terms. That is, features that are the product of a customer characteristic and a sales rep indicator. This isn't guaranteed produce a model where leads are assigned evenly between sales reps but might... | {
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"tags": "machine-learning, classification, regression, recommender-system, scoring",
... |
Podcast 302: Programming in PowerPoint can teach you a few things. Previous downloaded here programmers, and engineers with simple analysis tools like Excel. The mahalanobis function in R calculates the mahalanobis distance from points to a distribution. In Matlab, the code is as follow: Next % A and B (row = object, c... | {
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"lm_q2_score": 0.8376199633332891,
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"openwebmath_score": 0.5691320896148682,
... |
Not only does the third digit take on every value 0-9, but it also alternates between odd and even every time (as the Edit 2 note would require.) Also, the N digits cycle between two values, and each of the N digits besides the last one alternates between odd and even. I’ll make this more clear with one more example wh... | {
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"lm_q1_score": 0.9859363713038174,
"lm_q1q2_score": 0.8194541668254687,
"lm_q2_score": 0.831143054132195,
"openwebmath_perplexity": 262.723440120528,
"openwebmath_score": 0.7526844143867493,
"tags"... |
quantum-mechanics, quantum-information, mathematical-physics, density-operator
So this line of thought is working fine, because these are the correct expressions. Now I wanted to derive similarly the post-measurement state when the result of the measurement lies in $E\subset \sigma(A)$.
My line of thought was: if the ... | {
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"tags": "quantum-mechanics, quantum-information, mathematical-physics, density-operator",
... |
python, pandas
# Calculate the cumulative product of the px values in each row of the DataFrame constructed above. The (i, j)th
# entry of this DataFrame is the probability that a life aged i+100 (for 1 < i < 21) will still be alive after j
# years
return df_px_arr.cumprod(axis=1)
def prob_in_force_rowwis... | {
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} |
fft, power-spectral-density
I suggest looking at a time-frequency representation of your input signal (such as a spectrogram) to confirm this, and I'll edit this answer accordingly. | {
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python, python-3.x, unit-testing, matrix, complexity
def locate_zero_cols(matrix: list) -> list:
"""Given an NxM matrix find the columns that contain a zero."""
zero_cols = [False for _ in range(len(matrix[0]))]
for row_num, row in enumerate(matrix):
for col_num, element in enumerate(row):
... | {
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Your answer is now $$9\cdot 9\cdot 8-8\cdot 8\cdot 8=648-512=\boxed{136}$$
In you approach, you did not think of $$2$$ different cases:
• 2nd digit is $$0$$ or is not $$0.$$
It is easier (in Method 1) to count the possible digits in order 3-1-2. This gives $$8\times 8 \times 8$$ numbers non-divisible by $$5.$$ | {
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"ta... |
homework-and-exercises, newtonian-mechanics, energy-conservation
The energy of the top-most point at the chimney must've been conserved.
Energy is only conserved for isolated systems. Your assumption would be correct if the top of the chimney was disconnected from the remainder. However, there are forces within the c... | {
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} |
beginner, c, calculator
printf(" && !%.2f: (15)\n", c);
switch (choice) {
case 1: add = TRUE;
printf("%.2f + %.2f ", a, b); break;
case 2: subtract = TRUE;
printf("%.2f - %.2f ", a, b); break;
case 3: multiply = TRUE;
printf("%.2f * %.2f ", a, b); break;... | {
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"tags": "beginner, c, calculator",
"url": null
} |
electrostatics, charge, boundary-conditions, superposition, linear-systems
But this really doesn't seem right. For one thing, it doesn't $seem$ like the boundary conditions are really satisfied. In the $Q$ and $-Q$ system, there are three boundary conditions right? The imaginary plane where the potential is $0$, the n... | {
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"ur... |
Your sandwich between $\left(1+\frac{1}{n+1} \right)^n$ and $\left(1+\frac{1}{n}\right)^{n+1}$ is similar to this sandwich. (+1) – robjohn Oct 21 '11 at 2:13
@robjohn: You're absolutely right. Thanks for cleaning that up. – JavaMan Oct 21 '11 at 4:03 | {
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"openwebmath_score": 0.9790472984313965,
"tags... |
ros, rosbridge-server, roslibjs
Title: How can I send JSON data to and from ROS?
I am currently working on a task that involves constant intercommunication between a web browser (using roslibjs) and the ROS system through the rosbridge server. Is there a way to send JSON-formatted data from the browser to a ROS node?... | {
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"tags": "ros, rosbridge-server, roslibjs",
"url": null
} |
mathematical-physics
Another point to consider is that physical models is often "just mathematics with extra steps" as Rick and Morty would have put it, so essentially adding interpretation to mathematical concepts and identifying them with physical entities and phenomena is one of the essential parts of the job. Rela... | {
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"tags": "mathematical-physics",
"url": null
} |
quantum-gate, entanglement, experimental-realization, deutsch-jozsa-algorithm, photonics
2 qubits are encoded using a single photon.
Qubit 1's state is described by the path the photon is on and Qubit 2's state is described by the polarization of the photon.
Once the photon has passed from the laser past the 1st polar... | {
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The lesson to take home is that only the degree of a polynomial matters for its big-O classification.
-
That right there is a great answer, and you've jut helped me understand big O, finally, thanks a lot :D I appreciate it, I really do. – user6701 Sep 27 '11 at 21:06
Your conclusion is incorrect because you are mult... | {
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"openwebmath_perplexity": 194.34734329972665,
"openwebmath_score": 0.8508208990097046,
"ta... |
ros, jetson-tk1
Title: CMake error while building rpg_svo
CMake Error at /home/ubuntu/catkin_ws/devel/share/vikit_common/cmake/vikit_commonConfig.cmake:106 (message):
Project 'vikit_common' specifies '//include/opencv' as an include dir,
which is not found. It does neither exist as an absolute directory nor in
... | {
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"tags": "ros, jetson-tk1",
"url": null
} |
basic solution techniques work. 2 SOLUTION OF WAVE EQUATION. In this article, a few applications of Fourier Series in solving differential equations will be described. 3 SOLUTION OF THE HEAT EQUATION. INTRODUCTORY APPLICATIONS OF PARTIAL DIFFERENTIAL EQUATIONS With Emphasis on Wave Propagation and Diffusion This is the... | {
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"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9925393554326315,
"lm_q1q2_score": 0.8068027946996971,
"lm_q2_score": 0.8128673087708699,
"openwebmath_perplexity": 567.3037326971764,
"openwebmath_score": 0.7995803356170654,
"tags... |
c#, image
}
else if (ColorSpace == 2)
{
}
else if (ColorSpace == 3)
{
}
double avgChannelB = channelB / ((Width / 2) * (Height / 2));
double avgChannelGB = channelGB / ((Width / 2) * (Height / 2));
double avg... | {
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"url": null
} |
$|x+n|$ translates the graph $n$ units along the x axis, $|x|+d$ translates the graph $d$ units along the y axis, and $-|x|$ flips the graph so it opens downward.
$\lvert x + n \rvert$ is the graph of $\lvert x \rvert$ translated $n$ units to the left if $n > 0$. If $n< 0$ it will translate to the right. $n=0$ changes... | {
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"lm_q1_score": 0.9901401452783598,
"lm_q1q2_score": 0.8000997813569046,
"lm_q2_score": 0.8080672066194945,
"openwebmath_perplexity": 245.52214077395234,
"openwebmath_score": 0.7444196939468384,
"ta... |
homework-and-exercises, lagrangian-formalism, coordinate-systems, variational-principle, geodesics
Can you help me, especially with the derivation of the polar line element and the form of $\Phi$ in polar coordinates? Set $x = r \cos \theta$, $y = r \sin \theta$. Taking the total differentials, $$\mbox{d}x = \mbox{d}r... | {
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"tags": "homework-and-exercises, lagrangian-formalism, coordinate-systems, variational-prin... |
## 1 answer
+3
−0
According to Wikipedia, the set of (indices of) Turing machines that compute total functions, i.e. which halt on all inputs, is a $\Pi_2$ set. If we use the variation of the definition of arithmetical hierarchy which includes primitive recursive functions, then it is fairly straightforward^[If you a... | {
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"lm_q1_score": 0.9814534344029238,
"lm_q1q2_score": 0.8199881848670809,
"lm_q2_score": 0.8354835350552604,
"openwebmath_perplexity": 455.15680458196607,
"openwebmath_score": 0.8416422009468079,
"tags": ... |
python, nlp, bert, transformer, python-3.x
Title: An issue for sub-word tokenization preprocessing transformer I'm stacked with executing the sub-word tokenization preprocessing to use transformer.
According to the tutorial on the article, I have executed the sample code.
However, one function was not defined properly... | {
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"openwebmath_score": null,
"tags": "python, nlp, bert, transformer, python-3.x",
"url": null
} |
condensed-matter, graphene
Title: What's the temperature dependence of electrical conductivity for semi-metals? I am trying to teach undergraduate solid state physics when I realized that this problem is rarely discussed.
I know that metals' conductivity decrease with temperature due to increasing scattering at higher... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "condensed-matter, graphene",
"url": null
} |
c#, wpf, mvvm, system.reactive, reactive-programming
MainWindow.xaml.cs:
using System.Windows;
using TestHumanName.ViewModel;
namespace TestHumanName
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
... | {
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"openwebmath_score": null,
"tags": "c#, wpf, mvvm, system.reactive, reactive-programming",
"url": null
} |
javascript, performance, canvas
// Gets the average color of the requested area
function getAvgColorAsRGB(startX, startY) {
// Check to see if a cell placed at this location covers any part of the image
if(!( (startX < cw
&& startY < ch)
|| (startX + cellSize >= 0
&& startY + cellSize >= 0)
... | {
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"id": 17794,
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"tags": "javascript, performance, canvas",
"url": null
} |
ros, bebop-autonomy
Originally posted by TomRoussel on ROS Answers with karma: 1 on 2016-09-08
Post score: 0
Original comments
Comment by gvdhoorn on 2016-09-09:
I feel like you may have a better chance at getting a good answer by reporting this to AutonomyLab/bebop_autonomy/issues. If the dyn_recfg infra shows that ... | {
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"tags": "ros, bebop-autonomy",
"url": null
} |
# Is there a name for these regions produced by 4 intersecting circles? Can their areas be found without calculus?
Begin with a square. Using the side length as a radius, construct four circles, centered at each vertex. These circles divide the square into nine regions: four of one shape, four of another shape, and on... | {
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"lm_q1_score": 0.9793540650426279,
"lm_q1q2_score": 0.8139833286963101,
"lm_q2_score": 0.831143054132195,
"openwebmath_perplexity": 220.15874020205985,
"openwebmath_score": 0.7212280631065369,
"tag... |
quantum-mechanics, atomic-physics, spin-orbit, term-symbols
Title: What's the relationship between Term Symbol and Wave Functions? I'm trying to represent the Term Symbols in terms of wavefunctions and/or arrows for the excited state of hydrogen atom $2p^1$: $^2P_{3/2}$ and $^2P_{1/2}$.
Ideas I have:
The sum of $2J+1=... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, atomic-physics, spin-orbit, term-symbols",
"url": null
} |
rosdep, macos, macos-lion, osx
Originally posted by sissow2 on ROS Answers with karma: 1 on 2012-02-20
Post score: 0
Original comments
Comment by Kevin on 2012-02-20:
Are you using homebrew or macports for your dependencies?
Comment by Kevin on 2012-02-20:
FYI ... I still haven't gotten the kinect libraries (openni) ... | {
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"tags": "rosdep, macos, macos-lion, osx",
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} |
homework-and-exercises, experimental-physics, measurements, data-analysis
Well, there you go: The velocity is calculated from the positions by taking the difference of two positions and dividing by the time step $\Delta t$ of your measurement setup: $$v(t) \approx \frac{x(t + \Delta t) - x(t)}{\Delta t}$$
Since you kn... | {
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"url"... |
history, autoclave
They are using °C, but since it's 1890's retorts (autoclaves) used in food industry might be F and the authors probably converted retort eqipment readings to °C for scientific community.
Also, this was what pioneered thermal death study and if you look at the temperature that they used for the study... | {
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"id": 11085,
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"tags": "history, autoclave",
"url": null
} |
Finally in calculating $$q_{n,n+1}$$ it becomes evident that the underlying structure consists of two cycles joined at a common node or by a path, or a cycle with a chord, which in fact turns out to be two vertices joined by three edges. | {
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"lm_q1q2_score": 0.8185187835691543,
"lm_q2_score": 0.831143054132195,
"openwebmath_perplexity": 1222.4374077834893,
"openwebmath_score": 0.6012434363365173,
"tag... |
organic-chemistry, c-c-addition, c-x-addition
Consider p-nitrobenzaldehyde. Sterically, reactivity should be reduced due to the obvious bulk of the aromatic ring. Electronically, the picture seems to me to be more complex. From the perspective of valence bond theory, the $sp^2$ carbons may be electron-withdrawing by i... | {
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"openwebmath_score": null,
"tags": "organic-chemistry, c-c-addition, c-x-addition",
"url": null
} |
electromagnetic-radiation, nuclear-physics, potential-energy, strong-force
Title: How do nuclear transitions generate electromagnetic waves? In my last question, Can stimulated emission happen in nuclear energy states?, anna v mentioned this in his/her answer:
This involves nuclear transitions, but the output is elec... | {
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"tags": "electromagnetic-radiation, nuclear-physics, potential-energy, strong-force",
"ur... |
$\displaystyle \sum_{i \mathop = 1}^{k + 1} i = \frac {\paren {k + 1} \paren {k + 2} } 2$
### Induction Step
This is our induction step:
Consider $n = k + 1$.
By the properties of summation:
$\displaystyle \sum_{i \mathop = 1}^{k + 1} i = \sum_{i \mathop = 1}^k i + k + 1$
Using the induction hypothesis this can b... | {
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"lm_q1_score": 0.9932024678460111,
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"lm_q2_score": 0.8198933315126791,
"openwebmath_perplexity": 350.15779197942726,
"openwebmath_score": 0.9226561188697815,
"tags":... |
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