content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
A New Sliding Mode Controller for DC/DC Converters in Photovoltaic Systems
Journal of Energy
Volume 2013 (2013), Article ID 871025, 7 pages
http://dx.doi.org/10.1155/2013/871025
Research Article
A New Sliding Mode Controller for DC/DC Converters in Photovoltaic Systems
Faculty of Electrical Engineering, Imam Khomein... | 4 | [
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0.0561523437... | 29,100 | 29100 | |
the encyclopedic entry of Weak_topology
In
mathematics
,
weak topology
is an alternative term for
initial topology
. The term is most commonly used for the initial topology of a
normed vector space
or
topological vector space
with respect to its (continuous)
dual
. The remainder of this article will deal wi... | 4 | [
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Primitive root
October 4th 2008, 11:17 PM #1
Member
Joined
Nov 2007
Posts
108
Primitive root
I'm having difficulty with solving this problem, hope somebody could help.
Suppose (a,p)=1 where a is an integer and p is prime.
1) Show A={ $m, 2m, 3m,..., (p-1)m$} is is reduced residue system mod p.
... | 4 | [
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0... | 29,102 | 29102 | |
Inverse Scattering from a Sound-Hard Crack via Two-Step Method
Abstract and Applied Analysis
Volume 2012 (2012), Article ID 810676, 13 pages
http://dx.doi.org/10.1155/2012/810676
Research Article
Inverse Scattering from a Sound-Hard Crack via Two-Step Method
Department of Mathematics, National Cheng Kung Universi... | 4 | [
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Combinatorics Question
November 15th 2013, 02:23 PM
Urbandude23
Combinatorics Question
6 people each own a desk each. The company owner wants to swap them round, so at most one of them stays where they were before. How many arrangements are possible?
I've tried 264, which was the apparent sum of the arrange... | 5 | [
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Difficult Trig Limit
November 23rd 2009, 08:02 PM #1
Newbie
Joined
Oct 2009
Posts
6
Difficult Trig Limit
I seem to be having a tough time with this one limit problem:
Determine the limit of: $\lim_{x \rightarrow 0} \frac{tanx-sinx}{x^3}$
I've tried doing multiple simplifications but I have the ... | 5 | [
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Use Triangles & Simple Geometry to Aid Building Framing
How to square up decks, floors, walls or set stair rise & run
InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.
Triangles & geometry in building framing: this article de... | 4 | [
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[SOLVED] Linear Equation
January 17th 2009, 02:13 AM #1
[SOLVED] Linear Equation
Solve the system of linear equations in complex numbers:
$(2+i) x + (-3i) y = 3+i$
$3i x + (3-2i) y = 3-3i$
How would I do this?
you can easily solve linear equations like this 1 with Gaussian elimination
Mr ... | 5 | [
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Can anyone help to rearrange this equation??
May 8th 2012, 06:01 AM
lah183
Can anyone help to rearrange this equation??
Hi,I'm an engineering student, trying to re-arrange an equation but struggling, my tutor can't do it either!! I'd appreciate your advice or solutions. I have the following equation and need to
... | 5 | [
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Computing a sum using Parseval's theorem
January 8th 2011, 06:25 AM #1
Junior Member
Joined
Mar 2008
From
Sweden
Posts
61
Computing a sum using Parseval's theorem
Hi,
I have the following $2\pi$-periodic function:
$\displaystyle g(t)=e^{-t} ,\,\,0 < t < 2\pi$
I've computed the Exponent... | 5 | [
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0.0159912109375,
-0.0366210937... | 29,109 | 29109 | |
theorem of L'Hospital
Using the theorem of L'Hospital, calculate: $\lim_{n\to\infty} \frac{ln(x^2+x+1)}{ln(x^3+2x+1)}$ answer: $\frac{2}{3}$
I presume you mean $\lim_{x \to \infty} \frac{ln(x^2 + x + 1)}{ln(x^3 + 2x + 1)}$ This form is of the type $\infty / \infty$ so we can use L'Hopital. $\lim_{x \to \infty} \frac{l... | 5 | [
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arithmetic problem
April 13th 2010, 08:45 AM #1
Member
Joined
Jan 2008
Posts
173
arithmetic problem
A store sells juice in two sizes of bottles: small and large. A large bottle costs three times as much as a small one . jack bought 10 small bottles and 6 large bottles . with the same amount of
money ... | 4 | [
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imaginary part
October 22nd 2011, 10:43 AM
Random Variable
imaginary part
I'm having a hard time seeing why the following is true:
$\text{Im} \ i (1+e^{i\theta})^{\alpha} e^{i(\beta+1)\theta} = \Big(2 \cos \frac{\theta}{2} \Big)^{\alpha} \cos \Big( \big(\beta + \frac{a}{2} +1 \big) \theta \Big) \ \ \alpha, ... | 5 | [
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the encyclopedic entry of multiplicative identity
In mathematics, an identity element (or neutral element) is a special type of element of a set with respect to a binary operation on that set. It leaves other elements unchanged when combined with
them. This is used for groups and related concepts.
The term identity el... | 4 | [
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A New Solution for the Compression of a Two-Layer Strip and Its Application to Analysis of Bonding by Rolling
Advances in Materials Science and Engineering
Volume 2014 (2014), Article ID 702376, 9 pages
http://dx.doi.org/10.1155/2014/702376
Research Article
A New Solution for the Compression of a Two-Layer Strip and ... | 4 | [
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Chi-Square stuff?
May 25th 2009, 06:16 AM #1
Junior Member
Joined
Nov 2008
Posts
45
Chi-Square stuff?
Hmm, I am looking at this question but it wasn't covered in the lecture so I am looking forward to learn up how to do this kind of questions!
Let $X_1, ..., X_d$ be d independent normally distribute... | 4 | [
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Control for Multirate Networked Control Systems with Deadband Scheduling
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 715484, 7 pages
http://dx.doi.org/10.1155/2013/715484
Research Article
Control for Multirate Networked Control Systems with Deadband Scheduling
School of Automation, Nanjing Un... | 4 | [
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Isomorphisms on Weighed Banach Spaces of Harmonic and Holomorphic Functions
Journal of Function Spaces and Applications
Volume 2013 (2013), Article ID 178460, 6 pages
http://dx.doi.org/10.1155/2013/178460
Research Article
Isomorphisms on Weighed Banach Spaces of Harmonic and Holomorphic Functions
Departamento de Mat... | 5 | [
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Realized Jump Risk and Equity Return in China
Discrete Dynamics in Nature and Society
Volume 2014 (2014), Article ID 721635, 13 pages
http://dx.doi.org/10.1155/2014/721635
Research Article
Realized Jump Risk and Equity Return in China
^1School of Economics and The Wang Yanan Institute for Studies in Economics, Xiame... | 4 | [
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Isolate Real Roots of Real Polynomials
sage: from sage.rings.polynomial.real_roots import *
sage: x = polygen(ZZ)
sage: real_roots(x^3 - x^2 - x - 1)
[((7/4, 19/8), 1)]
sage: real_roots((x-1)*(x-2)*(x-3)*(x-5)*(x-8)*(x-13)*(x-21)*(x-34))
[((11/16, 33/32), 1), ((11/8, 33/16), 1), ((11/4, 55/16), 1), ((77/16, 165/32), 1)... | 5 | [
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Math-II ( Joint and Combined Variation)
Posted by jezzaD. on Friday, November 30, 2012 at 5:48am.
1. R varies jointly as S and t. If R=1/6,S=1/8 and T=3, find R when S=2 and T=11.
formula: R=KST
2. U varies jointly as L and H and inversely a S. If U=1.8, L=6.4, H=1.5 and S=-7.2, find U when L=4.3, H=5.1 and S=-2.2.
... | 4 | [
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Algorithm Analysis - Big-oh, etc...
February 3rd 2009, 05:49 AM #1
Newbie
Joined
Feb 2009
Posts
2
Algorithm Analysis - Big-oh, etc...
First of all, this is my first post so... Hi. I've already tried using the search function, but couldn't find anything along the lines I was looking for. I'm trying to lea... | 4 | [
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The Zero Product Property
The Zero Product Property simply states that if ab = 0, then either a = 0 or b = 0 (or both). A product of factors is zero if and only if one or more of the factors is zero.
This is particularly useful when solving quadratic equations.
Example:
Suppose you want to solve the equation
x^2 +... | 4 | [
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finding numbers
August 26th 2009, 07:52 AM #1
Member
Joined
Aug 2009
Posts
211
finding numbers
i have a question to do with quadratic equations but what i'm asking isn't really about quadratics but i need to it to complete the question. basically i've been set the question factorise
$54-15x-25x^2$. ... | 4 | [
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How deep is a parabola 4ft from edge. Word Problem.
April 21st 2009, 07:28 PM #1
Newbie
Joined
Apr 2009
Posts
8
How deep is a parabola 4ft from edge. Word Problem.
A cross-section of an irrigation canal is a parabola. If the surface of the water is 33ft wide and the canal is 15ft deep at the center, how ... | 4 | [
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Variant Gradient Projection Methods for the Minimization Problems
Abstract and Applied Analysis
Volume 2012 (2012), Article ID 792078, 16 pages
http://dx.doi.org/10.1155/2012/792078
Research Article
Variant Gradient Projection Methods for the Minimization Problems
^1Department of Mathematics, Tianjin Polytechnic Uni... | 5 | [
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Logs
Solve for http://webwork.mathstat.concordia.ca...dd0b8b8e91.png :http://webwork.mathstat.concordia.ca...d000b7e941.png I made it into log2x9/2=-3 2-3=x9/2 .125x-4.5=x -0.5625=x but I don't think it's
right
$\frac{9}{2} \log_2{x} = -3$ $\log_2{x} = -\frac{2}{3}$ $x = 2^{-\frac{2}{3}} = \frac{1}{\sqrt[3]{4}}$
Skee... | 4 | [
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derivative of the fourier transform
January 31st 2011, 05:27 PM #1
Member
Joined
Aug 2008
Posts
249
derivative of the fourier transform
my book defines the fourier transform as F(ξ) = integral (-infinite to infinite) f(x)e^iξx dx.
my book takes the derivative of the fourier transform and does:
D... | 4 | [
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1.7 Recursive Functions
1.7 Recursive Functions
A function is called recursive if the body of the function calls the function itself, either directly or indirectly. That is, the process of executing the body of a recursive function may in turn
require applying that function again. Recursive functions do not use any ... | 5 | [
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neat example of chaotic motion in a mechanical system • /r/math
you are viewing a single comment's thread.
[–]Hackenslacker1 point2 points3 points
sorry, this has been archived and can no longer be voted on
As far as the fulcrum is concerned, the forces applied by the levers when they are in a steady position is the... | 5 | [
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Math Help
February 1st 2008, 05:50 AM #1
Newbie
Joined
Feb 2008
Posts
2
transpositions
This ones beyond me!!
Make x the subject:
y=(x+4)(x+3)
if anyone can explain this one to me i would be forever grateful
Good question!
$y=(x+4)(x+3)\Rightarrow y=x^2+7x+12$
$x^2+7x+12-y=0... | 4 | [
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... | 29,130 | 29130 | |
compound interest
August 26th 2012, 01:45 PM #1
Newbie
Joined
Aug 2012
From
Manchester
Posts
15
compound interest
Compound interest is interest paid on an amount and on the interest already received on that amount. You can solve compound interest questions using the formula :
A = P ( 1 + R divid... | 4 | [
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Identifying First Order Diff Equations
September 26th 2012, 09:35 AM #1
Junior Member
Joined
Apr 2012
From
Texas
Posts
25
Identifying First Order Diff Equations
So the equation is $(xy+y)y' = x-xy$
It says to identify is the equation is Bernoulli, Separable, Linear and Homogeneous
If these de... | 4 | [
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Integral Majorization Theorem for Invex Functions
Abstract and Applied Analysis
Volume 2014 (2014), Article ID 149735, 4 pages
http://dx.doi.org/10.1155/2014/149735
Research Article
Integral Majorization Theorem for Invex Functions
^1Department of Mathematics, University of Peshawar, Peshawar 25000, Pakistan
^2Depar... | 5 | [
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... | 29,133 | 29133 | |
please solve the trig equation
Quote:
I followed your math up to where you stopped. What do you do now? At first I thought the two cubed sins will cancel each other out but they're both -2sin^3, so what do you do next? please
respond. thanks!!!
$\displaystyle \sin 2x \cos x+\cos 2x \sin x = \sin (2x+x... | 4 | [
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What is the last digit of 2^1000
November 26th 2007, 05:13 AM #1
What is the last digit of 2^1000
I just want to know a good way to attack problems of this sort. I think I have the idea somewhat, however some expertise on the matter could go a long way in hammering home these ideas.
What is the last digit o... | 4 | [
0.00738525390625,
0.021484375,
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0.00372314453125,
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... | 29,135 | 29135 | |
Basic functions
Scipy builds on Numpy, and for all basic array handling needs you can use Numpy functions:
>>> import numpy as np
>>> np.some_function()
Rather than giving a detailed description of each of these functions (which is available in the Numpy Reference Guide or by using the help, info and source commands)... | 5 | [
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New Approach for Solving a Class of Doubly Singular Two-Point Boundary Value Problems Using Adomian Decomposition Method
Advances in Numerical Analysis
Volume 2012 (2012), Article ID 541083, 22 pages
http://dx.doi.org/10.1155/2012/541083
Research Article
New Approach for Solving a Class of Doubly Singular Two-Point B... | 5 | [
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uniform acceleration question
January 29th 2009, 01:48 PM #1
Super Member
Joined
Sep 2008
Posts
607
uniform acceleration question
A particle X travels with a constant velocity of $6ms^{-1}$ along a straight line. It passes a particle Y which is stationarity. One second later particle Y accelerates at $2m... | 4 | [
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Nonnegative Matrix Factorization with Gaussian Process Priors
Computational Intelligence and Neuroscience
Volume 2008 (2008), Article ID 361705, 10 pages
http://dx.doi.org/10.1155/2008/361705
Research Article
Nonnegative Matrix Factorization with Gaussian Process Priors
^1Department of Informatics and Mathematical M... | 4 | [
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Learn about Applications of Lines in a Plane
Learn about Applications of Lines in a Plane In this lesson, let’s learn how we apply lines and slopes of lines in a plane in real life situations. So it says Ceciles is trying to decide between two
health clubs or sports club plans. Plan A says $140 upfront enrollment fee a... | 4 | [
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... | 29,140 | 29140 | |
Commuting Quasihomogeneous Toeplitz Operator and Hankel Operator on Weighted Bergman Space
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 408168, 8 pages
http://dx.doi.org/10.1155/2013/408168
Research Article
Commuting Quasihomogeneous Toeplitz Operator and Hankel Operator on Weighted Bergman Space
Dep... | 5 | [
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-0.0216064453125... | 29,141 | 29141 | |
Quick calc worded problem
May 23rd 2009, 09:26 PM #1
Newbie
Joined
Apr 2009
Posts
19
Quick calc worded problem
im stuck on ii
3) A culture of bacteria is growing at a rate proportional to the number,
$N$, of bacteria present, so that: $\frac{dN}{dt} = kN$
where $t$ is the time elapsed in hou... | 5 | [
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Chemistry: The Collision Model Video | MindBites
Chemistry: The Collision Model
About this Lesson
• Type: Video Tutorial
• Length: 12:08
• Media: Video/mp4
• Use: Watch Online & Download
• Access Period: Unrestricted
• Download: MP4 (iPod compatible)
• Size: 129 MB
• Posted: 07/14/2009
This lesson is... | 4 | [
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estimation
May 28th 2009, 09:17 PM
redpack
estimation
Let $f(x;\theta)=\frac{1}{\theta}x^{\frac{1-\theta}{\theta}}$, 0 < x < 1, 0 < $\theta$ < $\infty$
a. show that the maximum likelihood estimator of $\theta$ is MLE $\theta=-(1/n) \Sigma^{n}_{i=1} lnX_{i}$
b. show that $E(MLE\theta)=\theta$ and thus $... | 5 | [
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fair coin probability
May 24th 2006, 02:59 PM #5
May 24th 2006, 01:15 PM #4
Global Moderator
May 23rd 2006, 08:35 PM #3
Grand Panjandrum
May 23rd 2006, 07:37 PM #2
Global Moderator
May 23rd 2006, 07:25 PM #1
Newbie
Pffl. I don't know nothin' "normal!" -Dan
Man, I really wish I learned the normal curve ... | 5 | [
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Two-Period Inventory Control with Manufacturing and Remanufacturing under Return Compensation Policy
Discrete Dynamics in Nature and Society
Volume 2013 (2013), Article ID 871286, 8 pages
http://dx.doi.org/10.1155/2013/871286
Research Article
Two-Period Inventory Control with Manufacturing and Remanufacturing under R... | 5 | [
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0.002... | 29,146 | 29146 | |
I want check my answers
February 2nd 2010, 10:38 AM
r-soy
I want check my answers
Hi all
I want check my answer
Q 1 - Finif the sum of all integers between 1 and 100 inclusive ?
Answer :
firist tearm a1 = 1 d = 2
an = a1 + (n - 1 ) d
1 + ( n-1 )s = 100
n-1 = 99/2 = 48.5
then : S4... | 4 | [
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Net displacement for a point on a circular saw
1. The problem statement, all variables and given/known data
When a carpenter shuts off his circular saw, the 10.0-inch diameter blade slows from 4440 rpm to zero in 2.5 s.
A.What is the angular acceleration of the blade? In rev/sec^2
B.What is the distance traveled by a ... | 4 | [
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0.0... | 29,148 | 29148 | |
Solving the Matrix Nearness Problem in the Maximum Norm by Applying a Projection and Contraction Method
Advances in Operations Research
Volume 2012 (2012), Article ID 357954, 15 pages
http://dx.doi.org/10.1155/2012/357954
Research Article
Solving the Matrix Nearness Problem in the Maximum Norm by Applying a Projectio... | 4 | [
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0.09130859375,... | 29,149 | 29149 | |
arithmetic progression
May 18th 2010, 11:40 AM #1
Newbie
Joined
Mar 2010
Posts
4
arithmetic progression
how do i find common difference if the first term is 3 and the seventh term is twice the third term. bit of help.
Hi finnkeers,
Use $a_n=a_1+(n-1)d$
Let $x=a_3$
$a_3=a_1+(n-1)d$
... | 4 | [
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-0.026611328125,
-0.029296875,
0.0341... | 29,150 | 29150 | |
Two Coupled Queues with Vastly Different Arrival Rates: Critical Loading Case
Advances in Operations Research
Volume 2011 (2011), Article ID 216790, 26 pages
http://dx.doi.org/10.1155/2011/216790
Research Article
Two Coupled Queues with Vastly Different Arrival Rates: Critical Loading Case
^1Department of Mathemati... | 4 | [
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0.1279296875,
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Construction of Target Controllable Image Segmentation Model Based on Homotopy Perturbation Technology
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 131207, 8 pages
http://dx.doi.org/10.1155/2013/131207
Research Article
Construction of Target Controllable Image Segmentation Model Based on Homotopy Pert... | 4 | [
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0.041748... | 29,152 | 29152 | |
Help solve equation
March 7th 2007, 02:20 AM #1
Help solve equation
I am getting very fustrated with this equation. When I think I got the answer and do my checks to see if its right. I can not seem to make each side match. Can someone pleasehelp me?
3x – 5(3x – 7) = 2(x + 9) + 45
3x – 5(3x – 7) = 2(x ... | 4 | [
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0.... | 29,153 | 29153 | |
Line integral, vector calculus
Evaluate the line integral
Force field is the integral in the form of integrand ( (2x dx+ 2y dy + 2 zdz)/r^2).
the domain of integral is C,
C = C1 + C2. C1 is the line segment from (1; 2; 5) to (2; 3; 3). C2,arc
of the circle with radius 2 and centre (2; 3; 1) in the plane x = 2. The ar... | 4 | [
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0.020751953125,
-0.05615234375,
-0.0742... | 29,154 | 29154 | |
irreducible polynomial
April 4th 2010, 04:26 PM #1
Newbie
Joined
Mar 2010
Posts
4
irreducible polynomial
Hi guys,
I was wondering how I can prove that $x^4+x+2$ in the field $\mathbb{Z}_3[x]$ is irreducible?
I know how to do it if the degree is 3 or less, but here I have no idea..
Thanks in... | 4 | [
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exponential growth problem
January 22nd 2010, 12:41 PM
bhuang
exponential growth problem
I have totally forgotten how to do these questions, so I would really like to check my work...
A bacteria culture starts with 3000 bacteria and grows to a population of 12000 after 3 hours.
a) Find the doubling peri... | 4 | [
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Integration by parts problem.
September 27th 2011, 10:30 AM #1
Newbie
Joined
Sep 2011
Posts
2
Integration by parts problem.
Ok so I don't understand what I'm supposed to be doing in this problem:
if f(0) = g(0) = 0 and f" and g" are continuous, show that
$\int_0^a f(x)g''(x) \, dx = f(a)g'(a) -... | 5 | [
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0... | 29,157 | 29157 | |
the encyclopedic entry of group-representation
In the
mathematical
field of
representation theory
,
group representations
describe abstract
groups
in terms of
linear transformations
of
vector spaces
; in particular, they can be used to represent group elements as
matrices
so that the group operation can b... | 4 | [
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0.048... | 29,158 | 29158 | |
The tf-idf-Statistic For Keyword Extraction
February 27, 2014
By Raffael Vogler
The tf-idf-statistic (“term frequency – inverse document frequency”) is a common tool for the purpose of extracting keywords from a document by not just considering a single document but all
documents from the corpus. In terms of tf-idf... | 4 | [
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Help with a math problem.
2013-02-17, 09:05 PM #1
I need to find the derivative of sin^5(cos(6x))
It is a homework problem, but I am really just wanting someone the order of how I should work this problem.
I cba to do this myself, so here's a nice page for you:
http://www.wolframalpha.com/input/?i..... | 5 | [
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Math Help
February 19th 2008, 06:18 PM #1
Newbie
Joined
Feb 2008
Posts
3
Convolution
These are my equations
x[n] = δ[n] + 2δ[n-1] - δ[n-3]
h[n] = 2δ[n+1] + 2δ[n-1]
They want to know what
y[n] = x[n] * h[n] (where * is the convolution)
I am getting so lost on this problem. I do not ... | 5 | [
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Antenna Array Design for LOS-MIMO and Gigabit Ethernet Switch-Based Gbps Radio System
International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 920624, 10 pages
http://dx.doi.org/10.1155/2012/920624
Research Article
Antenna Array Design for LOS-MIMO and Gigabit Ethernet Switch-Based Gbps Radio ... | 4 | [
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... | 29,162 | 29162 | |
Arctan function
October 16th 2009, 02:30 PM #1
Member
Joined
Oct 2009
Posts
195
Thanks
1
Arctan function
f(x) = - (x/2) + 3arctan(1+2x) + (1/4)ln(1+2x+2x^2)
What is f(-1) and f(0), and how do I show that f has a stationary point in the interval (-1,0)? What is f'(x)?
It's the arctan(1+2x) t... | 5 | [
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Nonlinear Instability for a Leslie-Gower Predator-Prey Model with Cross Diffusion
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 854862, 13 pages
http://dx.doi.org/10.1155/2013/854862
Research Article
Nonlinear Instability for a Leslie-Gower Predator-Prey Model with Cross Diffusion
Department of Mathem... | 4 | [
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Exponents and Log Help!!
August 14th 2011, 09:18 AM #1
Newbie
Joined
Jul 2011
Posts
13
Exponents and Log Help!!
I have four problems I need help on:
5a^2/3*4a^3/2
(I believe it's multiplying, the copier messed up)
4a^5/3^3/2
log5(3x+1)=2
(It's log Base 5, as in the 5 there should be ... | 4 | [
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the encyclopedic entry of kekules formula
In mathematics and in the sciences, a formula (plural: formulae, formulæ or formulas) is a concise way of expressing information symbolically (as in a mathematical or chemical formula), or a general
relationship between quantities. One of many famous formulae is Albert Einstein... | 5 | [
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Rearrange in terms of z
September 14th 2011, 06:59 PM #1
Newbie
Joined
Sep 2011
Posts
8
Rearrange in terms of z
Hi,
I need to rearrange this function in terms of z, I'm struggling a little bit (asterisks are multiplication):
a*(z-b) = -c*d*(f/(f+z))-(c*g)-h*e*(f/(f+z))-(h*i)
Any help?
Re: ... | 4 | [
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Existence of a Period-Two Solution in Linearizable Difference Equations
Discrete Dynamics in Nature and Society
Volume 2013 (2013), Article ID 421545, 9 pages
http://dx.doi.org/10.1155/2013/421545
Research Article
Existence of a Period-Two Solution in Linearizable Difference Equations
Department of Mathematics, Univ... | 5 | [
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Conditional Probability and Independence
September 29th 2008, 09:19 PM
Yan
Conditional Probability and Independence
Suppose electric power is supplied from two independent sources which work with probabilities 0.4, 0.5, respectively. if both sources are providing power enough power will be available with
pro... | 4 | [
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Help with finding Cartesian Equations from Parametric Equations using Chain Rule
September 1st 2007, 05:54 AM #1
Newbie
Joined
Sep 2007
Posts
6
Help with finding Cartesian Equations from Parametric Equations using Chain Rule
Hi!
This is my first post here
I have encountered some trouble in my m... | 5 | [
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Help with cosets
April 18th 2011, 08:55 AM #1
Member
Joined
Nov 2009
Posts
79
Help with cosets
Let H be the group of the symmetries of a square. Denote by R reflection about the y-axis and by ρ the rotation by 90 degrees around the origin.
a)Give a representation of each of the 8 elements of H: e, ρ,... | 5 | [
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-0.0... | 29,171 | 29171 | |
please help i need to work out the intial value problem
September 3rd 2007, 08:17 PM #1
Newbie
Joined
Sep 2007
Posts
2
the derivate of y + y = 2 / (1+4e^2x)
y(-ln2)=pi/2
y=e^-x*tan^-1(2e^x)
i need to find out the intial value plz someone help me work it out
greatly appreciated
so nic... | 5 | [
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induction problem with fibonacci numbers
October 5th 2011, 01:40 AM
issacnewton
induction problem with fibonacci numbers
hi
here's another problem for the strong induction.
Prove that for all $n\ge 1$
$F_{2n-1}=\sum_{i=0}^{n-1}\;\binom{2n-i-2}{i}$
I let
$P(n)=\left[(n\ge 1)\Rightarrow\lef... | 4 | [
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trigonometry simplify
$750/ \pi\*48^2 = ((sin (1+x))^2 - (sin 1)^2)/2$ Find the value of x. Please help, its making me cry!
Well, sin(1) is just a constant, so $\frac{750}{\pi} \cdot 48^2 = \frac{sin^2(1 + x) - sin^2(1)}{2}$ $2 \cdot 48^2 \cdot \frac{750}{\pi} = sin^2(1 + x) - sin^2(1)$ $sin^2(1 + x) = 2 \cdot 48^2 \c... | 4 | [
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[Haskell-cafe] A tale of Project Euler
Andrew Coppin andrewcoppin at btinternet.com
Tue Nov 27 15:55:48 EST 2007
On the other hand, I must relay to you how much fun I had with certain
other problems.
For example, problem #12. I started with this:
triangles = scanl1 (+) [1..]
divisors n = length $ filter (\x ->... | 4 | [
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Looking for mathematical descriptions of gemstone cutting • /r/math
Looking for mathematical descriptions of gemstone cutting (self.math)
submitted by EcclesCake
sorry, this has been archived and can no longer be voted on
Hey all,
I'm currently doing some 3D modelling and I want to model a cut of gemstone, specific... | 4 | [
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Second derivative
Suppose that Find Does anyone know who to go about getting the second derivative from those two functions? Thank you
$F'(x) = \frac{d}{dx} \int_1^x f(t) dt = f(x)$ by the fundamental theorem of calculus. So $F''(2) = f'(2)$. You can find $f'(t)$ using the fundamental theorem of calculus as well. You ... | 5 | [
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Towards Human Capture Movement: Estimation of Anatomical Movements of the Shoulder
Discrete Dynamics in Nature and Society
Volume 2013 (2013), Article ID 586480, 13 pages
http://dx.doi.org/10.1155/2013/586480
Research Article
Towards Human Capture Movement: Estimation of Anatomical Movements of the Shoulder
^1Nation... | 4 | [
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Pose Space Surface Manipulation
International Journal of Computer Games Technology
Volume 2012 (2012), Article ID 596953, 13 pages
http://dx.doi.org/10.1155/2012/596953
Research Article
Pose Space Surface Manipulation
^1School of Science and Technology, Keio University, Kanagawa 223-8522, Japan
^2Department of Mecha... | 4 | [
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Common Fixed Points for Nonlinear Quasi-Contractions of Ćirić Type
Abstract and Applied Analysis
Volume 2014 (2014), Article ID 450792, 9 pages
http://dx.doi.org/10.1155/2014/450792
Research Article
Common Fixed Points for Nonlinear Quasi-Contractions of Ćirić Type
School of Mathematical Sciences, Inner Mongolia Uni... | 5 | [
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Word Problem-Related Rates
December 9th 2007, 11:14 AM
doctorgk
Word Problem-Related Rates
You are standing under a 20 foot lamppost. Your 5 foot friend is 10 feet away from you and sprints away at a speed of 20 feet per second.
(a) how fast is the tip of her shadow moving
(b) at that same instant, how f... | 5 | [
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0.007202148437... | 29,181 | 29181 | |
Trig equation check
March 20th 2010, 01:59 PM #1
Trig equation check
I would like to know if my answer is correct
Q: Solve this trig equation where x is an element of 0, 360.
$\frac{cos2x-cos5x}{sin2x+sin5x}=2\sqrt{3}$
$\frac{-2sin\frac{1}{2}(7x)sin\frac{1}{2}(-3x)}{2sin\frac{1}{2}(7x)cos\frac{1}{2... | 4 | [
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0.0068... | 29,182 | 29182 | |
the encyclopedic entry of over represent
The Gini coefficient is a measure of statistical dispersion most prominently used as a measure of inequality of income distribution or inequality of wealth distribution. It is defined as a ratio with
values between 0 and 1: A low Gini coefficient indicates more equal income or w... | 4 | [
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0.07421875,
0.051025390625,
0.058349609375,
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-0.064453125,
0.03076171875,
0.027099609375,
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... | 29,183 | 29183 | |
Using the Analytical Network Process to Select the Best Strategy for Reducing Risks in a Supply Chain
Journal of Engineering
Volume 2013 (2013), Article ID 375628, 9 pages
http://dx.doi.org/10.1155/2013/375628
Research Article
Using the Analytical Network Process to Select the Best Strategy for Reducing Risks in a Su... | 4 | [
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-0.0208740234375,... | 29,184 | 29184 | |
BUS 308 Entire Course *Statistics for Managers*
Week 1
DQ 1
Data Scales.
A marketing agency is interested in the buying habits of those who shop online versus those who shop in person. In your discussion post, address each of the following and explain your reasoning as to
why you picked the specific scale:
a. A dat... | 4 | [
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Asymptotic Behavior of Stochastic Partly Dissipative Lattice Systems in Weighted Spaces
International Journal of Differential Equations
Volume 2011 (2011), Article ID 628459, 23 pages
http://dx.doi.org/10.1155/2011/628459
Research Article
Asymptotic Behavior of Stochastic Partly Dissipative Lattice Systems in Weighte... | 4 | [
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Image Encryption Using a Lightweight Stream Encryption Algorithm
Advances in Multimedia
Volume 2012 (2012), Article ID 767364, 8 pages
http://dx.doi.org/10.1155/2012/767364
Research Article
Image Encryption Using a Lightweight Stream Encryption Algorithm
Cryptography and Secure Systems Laboratory, Faculty of Electri... | 4 | [
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0.04565429... | 29,187 | 29187 | |
Complex series
August 31st 2011, 08:12 PM #1
Junior Member
Joined
Sep 2008
Posts
64
Thanks
4
Complex series
I have this question, it asks to find the set of C numbers (z) where the series below converges.
What I've done so far is found the series by trial and error then taken the absolute... | 5 | [
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0.06591796875,
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[SOLVED] Confusing Functions
September 27th 2009, 06:54 AM
unstopabl3
[SOLVED] Confusing Functions
I've tried to do the following questions with the help of provided examples but can't seem to get a right answer. I don't think I am solving them with the right method.
1) A piece of wire $24 cm$ long has the ... | 4 | [
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Question to do with volume of a solid between a paraboloid and a plane
January 26th 2010, 07:11 AM #1
Member
Joined
Sep 2005
Posts
84
Question to do with volume of a solid between a paraboloid and a plane
Hi
the question is
Use polar coordinates to find the volume of the solid which is under th... | 5 | [
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Fixed point iteration help
November 6th 2011, 02:55 AM
Bloodzeed
Fixed point iteration help
With f defined as $f(x)=e^x+6x-5$, show the fixed point iteration
$x_{n+1}=\frac{5-e^{x_{n}}}{6}$, $n=0,1,...$
must converge to $x_{*}$ with $x_{0} \in [0,1]$
Had a go at this by using contraction mapping the... | 5 | [
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Consensusabilization for Continuous-Time High-Order Multiagent Systems with Time-Varying Delays
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 527039, 12 pages
http://dx.doi.org/10.1155/2013/527039
Research Article
Consensusabilization for Continuous-Time High-Order Multiagent Systems with Time-V... | 4 | [
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Trig. Identities (cos3x)
April 18th 2010, 05:51 PM
Savior_Self
Trig. Identities (cos3x)
Alright, I'll write what I have so far..
Show: $\cos3x = 4\cos^3x - 3\cos x$ (changing only $\cos3x$)
---
considering that $\cos3x = \cos(2x + x)$ and $\cos(A+B) = \cos A\cos B - \sin A\sin B$
we get...
... | 4 | [
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... | 29,193 | 29193 | |
Confidence and prediction intervals for forecasted values
The 95% confidence interval for the forecasted values ŷ of x is
This means that there is a 95% probability that the true linear regression line of the population will lie within the confidence interval of the regression line calculated from the sample data.
F... | 5 | [
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-0.11376953... | 29,194 | 29194 | |
Group Theory
December 6th 2008, 11:13 AM #1
Junior Member
Joined
May 2008
Posts
70
Group Theory
Let G be a finite group with g in G. Let N(G) be the centralizer of g in G be defined as {x|xgx^-1 = g}
Prove that N(G) is a subgroup of G
Letting S(G) = {xgx^-1|x in G}
Prove that |S(G)| = |G/N(G... | 4 | [
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0.0301513671875,
-0.0305175... | 29,195 | 29195 | |
HSOR.org: What is OR
In general, a queueing system involves customers who enter the system, wait in line (a queue), are served, and leave the system. While many familiar queueing situations involve only people as
customers and servers, there are also many applications in which one or both of these entities is inanimate... | 4 | [
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Rewriting a trig expression
April 4th 2009, 09:16 PM
yeunju
Rewriting a trig expression
Write the expression as the sine, cosine, or tangent of an angle
Problem: cos (pi/2) cos(pi/7) + sin(pi/2) sin(pi/7)
I start with the cos(u - v) = cos( pi/2 - pi/7) =
(90 degrees - 25.7) < turned radians into de... | 4 | [
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0.00... | 29,197 | 29197 | |
Proof by induction
May 15th 2013, 11:29 PM
Orpheus
Proof by induction
Hello guys could anyone help find a solution to this problem,
Show that:
3 x 5^(2n-1) + 2^(3n-2) is divisble by 17 (for every n on N*)
This is what i did :
verification for n = 1.
then we assume it is divisible for n and... | 4 | [
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Fuzzy RAM Analysis of the Screening Unit in a Paper Industry by Utilizing Uncertain Data
International Journal of Quality, Statistics, and Reliability
Volume 2012 (2012), Article ID 203842, 14 pages
http://dx.doi.org/10.1155/2012/203842
Research Article
Fuzzy RAM Analysis of the Screening Unit in a Paper Industry by ... | 4 | [
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-... | 29,199 | 29199 |