text stringlengths 1 1.11k | source dict |
|---|---|
java, beginner, calculator
This way, you main method would just read the input, call these methods and print the result. It would make your code more readable and testable (you would be able to test your methods separately)
The comments should explain what the code does and why it does what it does. They shouldn't des... | {
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"tags": "java, beginner, calculator",
"url": null
} |
physical-chemistry, kinetics, erratum
Since we have $2.0 \cdot 10^{-4}$ moles of dye per $\pu{50 mL}$ of solution, that means in $\pu{1 L}$ of solution, we get $2*(2.0 \cdot 10^{-4})$ moles of dye = $4.0 \cdot 10^{-4}$ moles
\begin{align}
\text{Rate of consumption/disappearance} &= \frac{-4.0 \cdot 10^{-4} \, \pu{mol}... | {
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"tags": "physical-chemistry, kinetics, erratum",
"url": null
} |
machine-learning, python, deep-learning, pytorch
TypeError: linear(): argument 'input' (position 1) must be Tensor, not int
BTW, my input tensors are from CIFAR10 dataset which were normalized to [0,1]. So, the error make no sense to me. Also, if I do not comment the code ```data= data.to(device) in coding, get simil... | {
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"tags": "machine-learning, python, deep-learning, pytorch",
"url": null
} |
everyday-chemistry, solutions
https://clorox.ca/products/sprays/clorox-all-purpose-disinfecting-cleaner-spray/
I've been doing as much research as a chemistry inept mechanical engineer can to find studies on the active ingredient and viruses, with mixed reviews, and am turning to you for help. I'm wondering if i follo... | {
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"tags": "everyday-chemistry, solutions",
"url": null
} |
newtonian-mechanics, angular-momentum, everyday-life, projectile, drag
Title: What causes a soccer ball to follow a curved path? Soccer players kick the ball in a linear kick, though you find it to turn sideways, not even in one direction. Just mid air it changes that curve's direction, i.e., it swings, as footballers... | {
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"tags": "newtonian-mechanics, angular-momentum, everyday-life, projectile, drag",
"url": ... |
ros, urdf, joint-state-publisher, qt5
Title: [kinetic] joint_state_publisher doesn't run
Hi,
I have a problem while lunching joint_state_publisher with any urdf file in ROS Kinetic and ubuntu 16.04
it crashes due to a missing library, I made sure that the library exists and is included in the path, but still the same... | {
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"tags": "ros, urdf, joint-state-publisher, qt5",
"url": null
} |
c, ascii-art
Here's my solution, maybe not the most optimal, but clean and short. I compute the distance from the current coordinate to nearest side and then remove it to the base number.
#include <stdio.h>
int main(void) {
int n = 5;
int a;
int b;
const int m = 2*n-1;
for (int i = 0; i < m; ++i) {... | {
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"tags": "c, ascii-art",
"url": null
} |
general-relativity, differential-geometry, geodesics
$$\frac{d}{d\lambda}\epsilon = u^a\nabla_a\epsilon=u^a\nabla_a(u^bu^c\xi_{bc}) = u^au^bu^c\nabla_a\xi_{bc}+u^c\xi_{bc}u^a\nabla_a u^b+u^b\xi_{bc}u^a\nabla_au^c$$
The three terms on the RHS all vanish. The first term is symmetric in the lower indices, so it is zero ... | {
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"tags": "general-relativity, differential-geometry, geodesics",
"url": null
} |
ros, catkin, libraries
<export>
</export>
</package>
However, when I try and use the libraries in another package, compilation crashes, stating that the header file cannot be found. The CMakeLists.txt for the package in which I want to use the libraries look like this:
cmake_minimum_required(VERSION 2.8.3)
project(... | {
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"tags": "ros, catkin, libraries",
"url": null
} |
java, beginner, sorting, interview-questions, complexity
read = br.read();
}
This saves us two arrays and a string at the cost of one smaller array. If you are really space constrained, mixing input and generation like this is better than mixing generation and output.
Of course, it is quite possible th... | {
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"tags": "java, beginner, sorting, interview-questions, complexity",
"url": null
} |
general applicability and future effect As of January 1, 2017. If the positive term. 6 Absolute Convergence and the Ratio and Root Tests: 試題(含解答). 2018 xiii+224 Lecture notes from courses held at CRM, Bellaterra, February 9--13, 2015 and April 13--17, 2015, Edited by Dolors Herbera, Wolfgang Pitsch and Santiago Zarzuel... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9877587275910131,
"lm_q1q2_score": 0.8453744381198375,
"lm_q2_score": 0.8558511451289037,
"openwebmath_perplexity": 668.8494962363595,
"openwebmath_score": 0.810046315193176... |
javascript, performance
On a large graph like in your real code, this means that instead of checking against every infected person, you'd only have to check against the infected people in 9 of the 480 segments on the graph. The smaller the infection radius and the larger the graph, the more improvement this approach p... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, performance",
"url": null
} |
number-formats
Title: Show that only a few multiples of .01 decimal are powers of 2 I am asking this to advance the argument that BigDecimal is better than float or double for representing exact amounts of currency.
Can someone refer me to a proof that between any two integers there are only four values that multipl... | {
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"tags": "number-formats",
"url": null
} |
growth and decay by. Another example is the amplitude as a function of. Exponential Functions Exponents can be variables. create exponential models to represent real life data. Exponential Functions - Identify The Equation of a Shifted Graph Logarithmic Functions - Match a Log Statement With Its Equivalent Exponential ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9852713891776497,
"lm_q1q2_score": 0.8210508857373975,
"lm_q2_score": 0.8333245994514082,
"openwebmath_perplexity": 529.5259514880022,
"openwebmath_score": 0.47181218862533... |
spectroscopy, stellar-evolution, stellar-structure, spectral-type
Now, of course, I know that such a thing is possible. I'm not asking whether it is possible. I just want to know the odds of such a lack of distinction, considering all the factors of stellar evolution. It's either in the ballpark or not. The spectrum o... | {
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"tags": "spectroscopy, stellar-evolution, stellar-structure, spectral-type",
"url": null... |
kinematics, spacetime-dimensions, degrees-of-freedom
There is no point in trying to define, which answer is correct and which is wrong. These are different descriptions of the same phenomena. So if your student gave you a consistent explanation, why the rotation is a 1D-motion, the student probably deserves the credit... | {
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"tags": "kinematics, spacetime-dimensions, degrees-of-freedom",
"url": null
} |
javascript, object-oriented, prototypal-class-design, closure
var latitude = document.getElementById( "inputLatitude" ).value;
var longitude = document.getElementById( "inputLongitude" ).value;
var zoom = document.getElementById( "inputZoom" ).val... | {
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"tags": "javascript, object-oriented, prototypal-class-design, closure",
"url": null
} |
So the nonzero terms in the sum correspond to the fixpoint-free permutations, also known as derangements. And the number of derangements of $n$ elements, call it $a_n$, is odd if $n$ is even (and even if $n$ is odd), which is easy to prove from the recursion $$a_1=0 ,\qquad a_n = n a_{n-1} + (-1)^n .$$ So your determin... | {
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"lm_q1_score": 0.9843363512883316,
"lm_q1q2_score": 0.8286395801772822,
"lm_q2_score": 0.8418256412990658,
"openwebmath_perplexity": 160.49654456748925,
"openwebmath_score": 0.9430809020996094,
"ta... |
go, concurrency, http
go fetchOne(&context)
context.Queue <- urlToFetch{url, depth}
<-context.Quit
}
func fetchOne(ctx *fetchContext) {
timeout := time.After(2000 * time.Millisecond)
select {
case utf := <-ctx.Queue:
if utf.Depth > 0 {
body, urls, err := ctx.Fetcher.Fetch(utf.Url)
ctx.Hist... | {
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"tags": "go, concurrency, http",
"url": null
} |
c#, algorithm, performance, sorting, image
Title: Organizing and visually duplicating images This algorithm is supposed to organize and visually duplicate images. I compare 2 images at a time; 1 is the first index image of the directory and another for comparing every other image in the directory. If there are duplica... | {
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"tags": "c#, algorithm, performance, sorting, image",
"url": null
} |
graph-theory
Is it correct? Is it proven anywhere? The two-connected series-parallel DAGs are also called 2-terminal series-parallel graphs. The graph in the figure is also known as Wheatstone graph and is known as the example graph for demonstrating Braess' paradox in algorithmic game theory.
It was shown [1, Theorem... | {
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"tags": "graph-theory",
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} |
python, beginner, python-3.x, authentication
elif userName == 'elmo' and password == 'blue': # The userName and password is equal to 'elmo' and 'blue', which is correct, they can enter FaceSnap!
print("Welcome! ") # Welcomes the User, the username and password is correct
break # Leave the loop and the ... | {
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"tags": "python, beginner, python-3.x, authentication",
"url": null
} |
python, k-mer, algorithms
We can also get a closed bound on the number of solutions. We can show that the sum of the first $D$ binomial coefficients for a fixed $N$ is bounded by ${N \choose D} {N-(D-1) \over N-(2D-1)}$ as shown here. Therefore we have the following closed upper bound on the number of strings within h... | {
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"id": 1879,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "python, k-mer, algorithms",
"url": null
} |
c#, delegates, state-machine
//Used for the default NullState
private void OnComplete(object isComplete)
{
Debug.LogWarning("Warning! You are acting on a Null State");
}
public void ChangeState<TU>(StateCompletion onComplete) where TU : IState, new()
{
//Assign next OnComplete Delegate
_nextOnComplete = o... | {
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"tags": "c#, delegates, state-machine",
"url": null
} |
astronomy, spectroscopy, telescopes
From there, it is a matter of simply isolating light from different areas of the image plane. You do not lose any light from that object, because all light from the object is where you want it already (this is only an idealized approximation, in real life you do lose a bit because o... | {
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"tags": "astronomy, spectroscopy, telescopes",
"url": null
} |
thermodynamics, collision, kinetic-theory
In practise most gases at STP are very close to ideal even though their collisions are almost always inelastic. In practice the requirement for elastic collisions doesn't matter that much.
Most collisions in real gases are inelastic because the sort of gases we encounter every... | {
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"tags": "thermodynamics, collision, kinetic-theory",
"url": null
} |
c#, performance, sql-server, asp.net, informix
string db_con = con;
if (con != "1")
con = "1";
if (string.IsNullOrEmpty(con))
{
con = "1";
}
int month_from = from_date.Month;
int month_to = to_date.Month;
int yr_from = from_date.Year;
int yr_to = to_date.Year;
int r... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, performance, sql-server, asp.net, informix",
"url": null
} |
classical-mechanics, tensor-calculus, hamiltonian-formalism
\dfrac{\partial Y_{\lambda}}{\partial q^{\mu}} &= 0 \quad \text{for all $\lambda,\mu \in\{1,\dots, n\}$, such that $\lambda < \mu$} \\\\
\dfrac{\partial X^{\mu}}{\partial p_{\lambda}} -
\dfrac{\partial X^{\lambda}}{\partial p_{\mu}} &= 0 \quad \text{for all ... | {
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"tags": "classical-mechanics, tensor-calculus, hamiltonian-formalism",
"url": null
} |
php, pdo
$container = new Pimple();
$container['db'] = function() {
$db = ...; // Construct the DB connection
return $db;
}
// Define a class that depends on the DB
class SomeObjectThatUsesDB {
function __construct($container) {
$this->container = $container;
// No `new` keyword – this is... | {
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"openwebmath_score": null,
"tags": "php, pdo",
"url": null
} |
python, beginner, python-3.x
def compare_words(word1, word2):
if not isinstance(word1, Word):
word1 = Word(word1)
perc = word1.check_rhyme(word2)
if perc > 50:
print("Good rhyme - {}%".format(perc))
else:
print("Not a good rhyme - {}%".format(perc))
if __name__ == '__main__': ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, beginner, python-3.x",
"url": null
} |
assembly, metagenome, wgs
Title: MetaQuast for assembling samples from complex communities I'm working with whole genome metagenomic samples from human skin, and I'm using MEGAHIT for assembly and MetaQuast for evaluation. However, MetaQuast requires a list of reference genomes for the analysis (if I understood correc... | {
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"id": 2229,
"lm_label": null,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "assembly, metagenome, wgs",
"url": null
} |
thermodynamics, phase-transition, nucleation
Problem
My professor asked us to determine the critical radius at which the solid spheres become more favourable energetically and thus, the supercooled liquid begins crystallising. She meant us to find $r^*$.
I think we should rather be looking at $r_0$, since it is the va... | {
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"openwebmath_score": null,
"tags": "thermodynamics, phase-transition, nucleation",
"url": null
} |
# Probability Problem with $n$ keys
A woman has $n$ keys, one of which will open a door. a)If she tries the keys at random, discarding those that do not work, what is the probability that she will open the door on her $k^{\mathrm{th}}$ try?
Attempt: On her first try, she will have the correct key with probability $\f... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.967899295134923,
"lm_q1q2_score": 0.8207473974904061,
"lm_q2_score": 0.8479677602988602,
"openwebmath_perplexity": 308.2279253609249,
"openwebmath_score": 0.8415741920471191,
"tags... |
quantum-field-theory, operators, string-theory, conformal-field-theory, wick-theorem
The relevant Wick's theorem is a nested Wick's theorem
$$ \begin{align} {\cal R}(:e^{A(z)}::e^{B(w)}:)~=~&\exp\left( C(z,w)\frac{\partial}{\partial A(z)}\frac{\partial}{\partial B(w)}\right): e^{A(z)+B(w)}:\cr ~=~&\ldots~=~e^{C(z,w)}:... | {
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"id": 70764,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-field-theory, operators, string-theory, conformal-field-theory, wick-theor... |
quantum-field-theory, quantum-electrodynamics, renormalization, correlation-functions, s-matrix-theory
virtual soft photons produce infrared divergences, not only directly, but also through their effect on the renormalization constants $Z_2$.
It is because the renormalization scheme has fixed $Z_2$ to be both IR and ... | {
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"tags": "quantum-field-theory, quantum-electrodynamics, renormalization, correlation-functi... |
protein-structure, pdb
Bonus: Protein pI.
Lastly, a caveat about pI of protein, you probably already know this, but best be safe. Your scores are all low, so I am guessing these surface mutations? Improving thermal stability is great for increasing the T_M measured by DSC or catalysis if you are scanning a transition ... | {
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"tags": "protein-structure, pdb",
"url": null
} |
ros, rosmsg, tutorials
Original comments
Comment by JoSo on 2014-06-17:
I am also a newbie and this worked for me but I don't quite understand. I have sourced 'source /opt/ros/hydro/setup.bash to my ~/.bashrc file so the ROS commands should work each time and they do, but why do I need to source if I'm already workin... | {
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Because $*$ is closed in $G$, we know $x_i \in G$. And, also, $$x_i*x_j = x^{p_i}*x^{p_j} = x^{p_i + p_j} = x^{p_j + p_i} = x^{p_j}*x^{p_i} = x_j*x_i$$
But I fail to demonstrate that $x=x_1*x_2*\cdots*x_k=x^{\frac{n}{n_1}}*x^{\frac{n}{n_2}}*\cdots*x^{\frac{n}{n_k}}$. I notice that it is as easy as demonstrating that $... | {
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"openwebmath_score": 0.9437229037284851,
"tags... |
java, xml, finance, javafx
try {
numericalUnitPrice = Double.parseDouble(unitPrice);
} catch (NumberFormatException exception) {
returnMessages.add("The unit price may only contain numbers and a decimal point!");
}
if(returnMessages.isEmpty()) {
StockItem st... | {
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"tags": "java, xml, finance, javafx",
"url": null
} |
python, beginner, game, pygame, snake-game
Whether to use or not relative position of the snake head. Instead of
actions, use relative_actions.
screen_rect: tuple of 2 * int
The screen rectangle, used to draw relatively positioned blocks.
"""
def __init__(self, player, board_size = 30, loca... | {
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"url": null
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Exercise 3. Write the approximate formula for the number of queries needed in the best case if we binary search $$n$$ items with splitting ratio $$1/3:2/3$$.
• I actually have a doubt, shouldn't it be n divided by (3/2)^k is approximately equal to 1 in the second para? – Hema Jun 20 '19 at 4:22
• Thanks, updated. – Jo... | {
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"openwebmath_score": 0.7922695279121399,
"tags... |
quantum-field-theory, dirac-matrices, trace, textbook-erratum
However, when I calculate this trace, I find that I get $$\frac 1 {4m^2}(8E_1E_2 - p_1\cdot p_2 +4m^2),$$
which appears to be missing a coefficient of $4$ on the second term. | {
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"tags": "quantum-field-theory, dirac-matrices, trace, textbook-erratum",
"url": null
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energy-efficiency, renewable-energy, power-engineering, wind-power
Title: What theoretical efficiencies can wind / hydro turbines achieve? The high water has some energy E = mgh. In the basic school, we were told that hydropower plants extract the energy of "falling water". Now, that banned principle says that if your... | {
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"tags": "energy-efficiency, renewable-energy, power-engineering, wind-power",
"url": nu... |
waves, harmonic-oscillator
Title: Why can waves (audio, eletromagnetic, etc.) be represented by a circle? I found an intuitive reason for the sine function, but want one that can be used for all kinds of waves. I've found a good explanation summarized in the following figure: | {
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sql, sql-server, stored-procedure
EXEC(@PermissionSQL);
SET @Start = @Start + 1;
END
END
ELSE
BEGIN
PRINT 'Role: ' + @NewRoleName +' not set up in this database.';
END
END
GO
Is there any way to avoid the row-by-row processing? Or any other ... | {
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operating-systems
In the both cases, the signal must be handled either by custom or default handler. For the synchronous it is crashing the running process, and in asynchronous, it is using the default routine whatsoever is defined in the system.
Here is the list of questions I have in my mind right now:
What does ex... | {
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concepts are linear combination, linear dependence, basis, subspace. Definition of Change of Basis. (f) Determinants 3. • Alternative is to use linear algebra approach – Simple – Robust – Performs automatic relevance detection 8 Constructing a Basis for the Images • Each image Γi is treated as a single vector of dimensi... | {
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"openwebmath_score": 0.6875345706939697,
"tags": n... |
calibration, ros-groovy, stereo-calibration, camera, stereo
they work nicely. Then I want to calibrate them with the following command:
rosrun camera_calibration cameracalibrator.py --size 9x7 --square 0.0053 right:=/stereo/right/image_raw left:=/stereo/left/image_raw left_camera:=/stereo/left right_camera:=/stereo/r... | {
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ros, ros2, python3
import rclpy
from rclpy.node import Node
from sensor_msgs.msg import CameraInfo, Image
from cv_bridge import CvBridge, CvBridgeError
from std_msgs.msg import String
from std_msgs.msg import Int16MultiArray
import cv2, math, time
class DroneNode(Node):
def __init__(self):
super().__in... | {
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noise, snr, radar
Journal of Computer Networks and Communications, vol. 2018, Article ID 9319204, 8 pages, 2018.
https://doi.org/10.1155/2018/9319204
Complete text available in Hindawi
Particularly this table shows a couple ways SNR can be estimated for OFDM signals as defined in this text.
And I say it again : Reliab... | {
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"tags": "noise, snr, radar",
"url": null
} |
xgboost, features, pipelines
Title: order of features importance after make_column_transformer and pipeline I have a data preparation and model fitting pipeline that takes a dataframe (X_trn) and uses the ‘make_column_transformer’ and ‘Pipeline’ functions in sklearn to prepare the data and fit XGBRegressor.
The code l... | {
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"tags": "xgboost, features, pipelines",
"url": null
} |
cosmology, black-holes
Title: Amateur's question on Black Holes Black holes are caused by massive curvature of the fabric of space-time. Is it right in believing theoretically that forces of electromagnetic origin could also lead to distortion of the fabric of space-time, (though it may not be as tremendous as the ext... | {
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"tags": "cosmology, black-holes",
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organic-chemistry, stereochemistry
Be consistent when redrawing the molecule with the original drawing. Don't draw the wedged bond on the top of the molecule if it was on bottom in the original drawing. Hopefully this helped, this is a confusing subject though and like I said earlier it's difficult to explain even in... | {
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c++, performance, c++20, priority-queue
But in the process you have changed the interface in other ways. It would be nicer if it was a drop-in replacement for std::priority_queue with just the added raise_priority() member function (and perhaps add a lower_priority() as well).
First, add a template parameter Container... | {
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python, turtle-graphics
Here is what an example of a command file looks like:
name Loopy
loop 10 top ;loops MUST be named at both the top and the bottom of the loop
forwards 40
loop 4 square ;loop syntax is "loop [number of iterations] [loop name]"
left 90
forwards 10
endloop square
left 36
endloop top | {
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that two events will both occur. of a probability weighting function (PWF) is crucial in addressing S1-S3. Dependent events are what we look at here. Two consecutive draws are made from the box without replacement of the first draw. Note that P (A ∩ B) P(A \cap B) P (A ∩ B) is the probability of both A A A and B B B oc... | {
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"openwebmath_score": 0.7463113665580... |
– this is the set of output values generated by the function (based on the input values from the domain set). Graph the function on a coordinate plane.Remember that when no base is shown, the base is understood to be 10 . We could say, let's say we the real numbers such that y, such that they're also The graph is nothi... | {
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"lm_q1_score": 0.986571747626947,
"lm_q1q2_score": 0.8263721850743451,
"lm_q2_score": 0.8376199572530448,
"openwebmath_perplexity": 407.7996338923654,
"openwebmath_score": 0.7109644412994385,
"ta... |
quantum-optics, cavity-qed
Title: What is QED about "Cavity QED"? As I understand it, when papers and books refer to "Cavity QED" they simply mean the strong coupling regime of two-level system to a photon field in a resonator, i.e. Jaynes-Cummings and variants thereof. In other words, I could understand the whole pro... | {
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homework-and-exercises, dirac-matrices, trace, clifford-algebra
By making use of these anti-commutation relations, we can rearrange the first equation to
\begin{align} \mathrm{Tr} (\gamma^{\alpha}\,\gamma^{\alpha}\,\gamma^{\mu}\,\gamma^{\nu}\,\gamma^5\,\gamma^{\alpha}\,\gamma^{\alpha}) &= - \mathrm{Tr} (\gamma^{\alpha... | {
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and links to explanations to these these GMAT probability problems are at the end of set. Get Textbook Solutions and 24/7 study help for Statistics And Probability Step-by-step solutions to problems over 34,000 ISBNs Find textbook solutions Close. It is the ratio of the number of ways an event can occur to the number o... | {
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"lm_q1q2_score": 0.864750244018912,
"lm_q2_score": 0.8774767986961401,
"openwebmath_perplexity": 589.712825578324,
"openwebmath_score": 0.7061757445335388,
"tags"... |
Box plots include notches for the comparison of the median values. Two medians are significantly different at the 5% significance level if their intervals, represented by notches, do not overlap. This test is different from the F-test that ANOVA performs; however, large differences in the center lines of the boxes corr... | {
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"lm_q1_score": 0.9888419671077918,
"lm_q1q2_score": 0.8303641864572137,
"lm_q2_score": 0.8397339656668286,
"openwebmath_perplexity": 779.1603126949233,
"openwebmath_score": 0.7590203285217285,
"tags": n... |
microbiology, lab-techniques
Title: Why lab technicians use indirect (antibody reaction) method for diagnosing? In microbiology we have two types of microbial diagnosis. The direct method is where we detect the invader's DNA, Antigens or culture to see the exact pathogen while the second, indirect, method is the react... | {
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c++17
for (const Student& objStudent : objStudents) {
std::cout << "ID: " << objStudent.ID() << " | ";
std::cout << "Name: " << objStudent.name() << " | ";
std::cout << "Score: " << objStudent.result() << "\n";
}
}
auto highest_mark_by_student... | {
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observational-astronomy, galaxy, data-analysis, python
The y-axis corresponds to the distance from the center, where the center is at the most bright green part (y_index about 595). The x-axis corresponds to the wavelengths. The data shows the long-slit-spectra of an elliptical galaxy. And here is where I am getting a... | {
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"tags": "observational-astronomy, galaxy, data-analysis, python",
"url": null
} |
probability, continuum-mechanics, fermis-golden-rule
\begin{equation}
\Gamma_f = \frac{2\pi}{\hbar} |\langle f|V|i\rangle|^2 \delta(E_i-E_f)
\end{equation}
and taking $|i\rangle = |e\rangle$, $|\chi_U\rangle = |f\rangle$,
the matrix element of your $V$ is
\begin{equation}
\langle \chi_U| \int dU' \left (\xi_{U'}|\chi_... | {
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"tags": "probability, continuum-mechanics, fermis-golden-rule",
"url": null
} |
moon-phases
But I'm not able to calculate when the full moon happens inside the window of the 48 h we call "weekend". Some further info on the actual distribution pattern.
The synodic month and the week length is descended by 1.53059 days, so one month later the full moon comes 1.53059 days later in the week.
That mea... | {
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ros2, ros-crystal
but then:
Get:3 http://packages.ros.org/ros2/ubuntu bionic/main amd64 Packages [344 kB]
Get:4 http://packages.ros.org/ros2/ubuntu bionic/main arm64 Packages [331 kB]
Assuming you're actually running an armhf platform:
If I interpret REP-2000: ROS 2 Target Platforms - Platforms by Distribution - Cr... | {
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Lastly, we should have an $$O(n)$$ algorithm.
• This was a good hint. Assume zero-indexed arrays. Starting with sum = maxPossibleSum, iterate through the array adding elements to a set. If the added element is a duplicate, sum = sum - (indexPreviousOccurrence + 1) * (totalElements - currentIndex). This requires just o... | {
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"openwebmath_score": 0.8311969637870789,
"tag... |
And they are asking: When is the function negative?
. . That is: When is the parabola below the x-axis?
Got it?
6. Thanks for all the help everyone. I totally understand this now. As for Pankaj's questions:
(i) $\displaystyle -5<x<1$ and $\displaystyle -2<x<3$
(ii) $\displaystyle -4<x<7$
I hope they're right, and... | {
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"openwebmath_score": 0.8474603891372681,
"tag... |
python, python-2.x, linux
... strike me as odd. 'Predefining' doesn't make any sense in Python here, because Python is weakly typed.
In get_pid(), cpuusage is never used beyond assignment.
Good job on using os.path.join(), but you missed a case in get_pid():
pidfpath = pidfolder + '/' + f # ...
... should be:
pidfpat... | {
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c++, performance
Title: Wrote My own data structure. Mixture of a doubly linked list & unordered map C++ I decided to make my own data structure. I did this because I wanted a data structure that is a queue but has o(1) time on lookup.
template <class Object>
class ObjectQueue;
template <class Object>
class Obje... | {
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light, space-time, cosmological-inflation
A - a photon travelling from a distant galaxy to earth
B - a photon travelling from a point of higher to a point of lower
gravity
C - either
If like me you think the answer is C, can you explain why light should travel differently through a gravitational field to how it trave... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "light, space-time, cosmological-inflation",
"url": null
} |
transform
// braodcast the tf
_tf_bc.sendTransform(odom_tf);
Does anyone have any ideas as to what might be causing this to fail?
Originally posted by MikeSands on ROS Answers with karma: 86 on 2011-05-24
Post score: 0
If you haven't already, you might want to check out robot_pose_ekf which does pretty much what yo... | {
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java, recursion, time-limit-exceeded, backtracking, knapsack-problem
Title: Loading military units into ships optimally, using backtracking I solved the following problem using backtracking:
We are given a list of military units, their weight and their
(numerical) strength. We have a number of ships with a limited
... | {
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"tags": "java, recursion, time-limit-exceeded, backtracking, knapsack-problem",
"url":... |
reach their goal in ACT. TRIGONOMETRIC IDENTITIES Reciprocal identities sinu= 1 cscu cosu= 1 secu tanu= 1 cotu cotu= 1 tanu cscu= 1 sinu secu= 1 cosu Pythagorean Identities sin 2u+cos u= 1 1+tan2 u= sec2 u 1+cot2 u= csc2 u Quotient Identities tanu= sinu cosu cotu= cosu sinu Co-Function Identities sin(ˇ 2 u) = cosu cos(... | {
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"id": null,
"lm_label": "1. Yes\n2. Yes",
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"lm_q2_score": 0.8902942261220292,
"openwebmath_perplexity": 2061.6495554520557,
"openwebmath_score": 0.5778871178627014,
"... |
newtonian-gravity, potential-energy, definition
Based on the reasoning above, the force exerted by the external agent must be equal in magnitude to gravitational force to ensure velocity is constant and thus, increases as the test mass approaches the central mass since r decreases and $F=GMm/r^2$. Thus, the work done ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-gravity, potential-energy, definition",
"url": null
} |
ros-melodic
This is imu.yaml file
imu_type: 7
imu_frame: imu_link
i2c_bus: 1
i2c_slave_address: 104
fusion_type: 2
mpu9150:
#Sample Rates
compass_sample_rate: 25 # 40
gyro_accel_sample_rate: 50 # 80
#Accel
accel_low_pass_filter: 3
accel_full_scale_range: 8 # 16
#Gyro
gyro_low_pass... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "ros-melodic",
"url": null
} |
c++, strings
UpperCasePolicy(ToUpper to_upper) : m_to_upper{ to_upper } {}
std::pair<const_iterator, const_iterator> find_next_word(const StringType& text, const_iterator first) override
{
using std::begin; using std::end;
return { begin(text), end(text) };
}
v... | {
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"openwebmath_score": null,
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"url": null
} |
So $2^{2k}-1$ is not prime when $k>1$.
Alternatively: $4^n-1=(4-1)(4^{n-1}+...+1)$ (used David's idea here).
• How does (lack of) divisibility by $3$ prove it to not divisible by all other primes till $2^n-1$? Or do you mean to show similarly for all primes till $2^n-1$? If so, what would you take as $a$ in $n=ak$, f... | {
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"lm_q2_score": 0.8479677583778258,
"openwebmath_perplexity": 199.85895321787746,
"openwebmath_score": 0.9207397103309631,
"ta... |
machine-learning, neural-network, cnn, image-classification
Title: images from training set are different from images of test set I am doing image classification with CNN and I have a training set and a test set with different distributions. To try to overcome this problem I am thinking about doing a standardization u... | {
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"id": 6541,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "machine-learning, neural-network, cnn, image-classification",
"url": null
} |
biochemistry, entomology, biophysics, anatomy
Title: What causes the opaque green colour in Lepidoptera? Link here to what I mean by 'opaque' colouration on the insect, the colour intensity remains constant despite changes in light intensity and angle (not shown by the picture but the moth exhibits this in the field).... | {
"domain": "biology.stackexchange",
"id": 5055,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "biochemistry, entomology, biophysics, anatomy",
"url": null
} |
java, algorithm, strings
sb.delete(0, sb.length());
for (int i = 0; i < M; ++i) {
sb.append('a');
}
String pattern = sb.append('b').toString();
System.out.println("[WORST CASE OF String.indexOf]");
demo(text, pattern);
long seed = System.currentTimeMillis... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, algorithm, strings",
"url": null
} |
telescope, identify-this-object, observatory
Title: Why does this Lowell Observatory telescope have so many knobs? What do they all do? The Fox News article Arizona city played critical role in moon exploration history covers several interesting activities that took place in Arizona in preparation for the Apollo Moon ... | {
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"tags": "telescope, identify-this-object, observatory",
"url": null
} |
6. Sep 28, 2016
### moenste
Like this?
For (b) we need to find I60 Ω. I = V / R or I = V / 60. How to find V? V = I R. Or V = V1 + V2 + V3. Or IR = IR1 + IR2 + IR3.
40 + 60 = 100 Ω. So I = 6 / 100 = 0.06 A. V60 Ω = 0.06 * 60 = 3.6 V.
Last edited: Sep 28, 2016
7. Sep 28, 2016
### CWatters
Exactly.
8. Sep 28, 201... | {
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"openwebmath_score": 0.6474526524543762,
"tags... |
php
Well, I realize that's a lot to read so I'll leave it at that. I appreciate any feedback to the code or questions posed.
Edit in response to Yannis Rizos answer:
Admittedly I was not aware of the breadth of iterators available from the SPL, perhaps I will go back and refactor the data structure to use one of thes... | {
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"tags": "php",
"url": null
} |
java, beginner, primes, homework
Title: Test a number for primality and return smallest divisor different from 1 if it’s is composite In this exercise we were asked to test a number for primality and print the results. Additionally – in the case the number is composite – the smallest divisor different from 1 should be... | {
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"tags": "java, beginner, primes, homework",
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} |
Another thing I see wrong with this, is that if 0.999... is equal to one, what's to stop pi from being equal to 4, or, at the very least, 3.2? Pi is an infinitely long number, so it keeps adding up decimals. It should eventually get as close to 3.2 as 0.999... will ever get to 1.
Doctor Rick answered, diving more de... | {
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"lm_q2_score": 0.8354835432479661,
"openwebmath_perplexity": 474.46085814317155,
"openwebmath_score": 0.7642335295677185,
"t... |
python, beginner
# Handles error exceptions and prints out the error#
except(KeyError, KeyboardInterrupt, IndexError, NetmikoTimeoutException, NetmikoAuthenticationException) as error:
output = Toplevel(root)
output.title("Output Window")
output.iconbitmap('cisco.ico')
label = Labe... | {
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"url": null
} |
algorithms, data-structures, arrays, hashing
A[i] + A[k] &= A[j] + A[\ell] \\
A[i] + A[\ell] &= A[j] + A[k]
\end{align}
In fact, all of these are equal to $X/2$, and this implies that $A[i] = A[j] = A[k] = A[\ell]$.
The hashtable entry for $X/2$ can only contain two of the indices $i,j,k,\ell$, say $i,j$ (it might con... | {
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"tags": "algorithms, data-structures, arrays, hashing",
"url": null
} |
c#, object-oriented, design-patterns
and TestSequence would run all it's tests:
public class TestSequence : ITest
{
private IList<ITest> tests = new List<ITest>();
public void Run()
{
Setup();
foreach(var test in tests)
test.Run();
Teardown();
}
public void Setu... | {
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"url": null
} |
python, logging, mongodb
Parameters
----------
database_name: str, optional
The name of the database. The default 'None'.
Raises
------
ValueError
If database name is None.
"""
database_name = self.conf.get(DATABASE, database_name)
... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "python, logging, mongodb",
"url": null
} |
reinforcement-learning, convolutional-neural-networks, pytorch, convolution, convolution-arithmetic
Naturally, there is spatial interaction in each layer but also interaction between layers. I am considering two approaches to a convolution architecture. Note, I am using PyTorch, so I apologise if I am using PyTorch-sp... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reinforcement-learning, convolutional-neural-networks, pytorch, convolution, convolution... |
star, black-hole, galaxy
You are overestimating the size and the capabilities of a supermassive black hole. Contrary to pop sci portrayals of black holes, black holes are not giant vacuum cleaners in space that suck up anything and everything close by. While the supermassive black hole at the center of the Milky Way i... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "star, black-hole, galaxy",
"url": null
} |
ai, gpt, tokenization
represented by different tokens), so I'm really curious what the methodology of making a token set is. Obviously how tokens are made will have a huge impact on how the system as a whole performs, yet unlike the attention mechanism very little seems to have been written about it. ChatGPT uses byte... | {
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"openwebmath_score": null,
"tags": "ai, gpt, tokenization",
"url": null
} |
dct
Title: what is the differnence between 8x8 dct coefficients and 25 x 25 dct coefficients? As I knkw the DCT is discrete cosine transform that mostly used in time domain analysis to frequency domain. Also 8x8 is used in nomaly in img processing. I don't know why that is defined by 8x8 .anyway 8x8 is used in process... | {
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"id": 3022,
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"openwebmath_score": null,
"tags": "dct",
"url": null
} |
c#, algorithm, .net, linq
Title: Eliminating repetitions of subsequent items in a list I would like to convert a list A
A = {1, 12, 3, 3, 3, 8, 5, 5 }
into list B
B = {1, 12, 3, 8, 5 }
As you see, items 3 and 5 are repeated in A, and those repetitions are eliminated in B.
The code I've created to do that is the foll... | {
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"tags": "c#, algorithm, .net, linq",
"url": null
} |
reference-request, time-complexity, machine-models
[EDIT: I think there are too many errors in the below for it to be useful. I'm still trying to develop the same idea, a machine that has too much trouble keeping track of a count to be translatable in quasilinear time.] | {
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"url": null
} |
botany, food, toxicology
Title: Are there any air-plants with parts that are edible for humans? Are any air plants (Tillansia sp.) safe for humans to eat? I haven't been able to find whether or not there are. Pineapple is in the same family (Bromeliaceae), but isn't an air plant. Monstera deliciosa seems to fit the bi... | {
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"openwebmath_score": null,
"tags": "botany, food, toxicology",
"url": null
} |
But there is a possibility that there is a tie.
As n gets to be very large, I would expect our probability to approach $$\frac 14$$
There are $$n^4$$ possibilities for the 4 dice to come up.
if you roll a $$k$$ on your last die there are $$(n-k)$$ ways to roll better than that, and $$(n-k)^3$$ to roll 3 dice better ... | {
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"lm_q2_score": 0.857768108626046,
"openwebmath_perplexity": 187.7219510469037,
"openwebmath_score": 0.5211573839187622,
"tags... |
# Summation of series
#### Erfan
##### New member
Prove that 1/(1*2*3) + 1/(2*3*4) + ... + 1/(n*(n+1)*(n+2)) = 1/4 - 1/(2*(n+1)*(n+2)
.
#### MarkFL
##### Administrator
Staff member
Hello Erfan,
Are you expected to use partial fraction decomposition or induction, or is the choice of method up to you? Can you show u... | {
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"lm_q1q2_score": 0.8129412235292327,
"lm_q2_score": 0.8267117962054049,
"openwebmath_perplexity": 1409.0264172372506,
"openwebmath_score": 0.8228080868721008,
"ta... |
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