content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Representation of a Solution of the Cauchy Problem for an Oscillating System with Multiple Delays and Pairwise Permutable Matrices
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 931493, 10 pages
http://dx.doi.org/10.1155/2013/931493
Research Article
Representation of a Solution of the Cauchy Problem for... | 5 | [
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population model, so confused
June 9th 2009, 03:41 PM #1
Newbie
Joined
May 2009
Posts
7
population model, so confused
h, a constant.
dN/dt=rN(1-(alpha)*(N))-h
r,h,alpha +ve constants
1.)assume r>4h(alpha).find and classify the steady states N_1 and N_2 where N_1<N_2.
I can find steady... | 4 | [
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Stats: proving an equality with summations
February 2nd 2009, 09:41 AM #1
Stats: proving an equality with summations
Spent several hours trying to prove this, and now my eyes are swimming :/
I need to show that: $ns^2_{n+1} = (n-1)s^2_n + \frac{n}{n+1}(x_{n+1} - \bar{x}_n)^2$
where $\bar{x}$ is the mean... | 4 | [
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implicit differentiation help
December 8th 2009, 10:17 PM #1
Junior Member
Joined
Oct 2009
Posts
72
implicit differentiation help
A curve is defined implicitly by the equation
$x^3 + y^3 = 6xy$
a)Using Implicit Differentiation
b)Determine the location of each point on the curve whose tangen... | 5 | [
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Short Circuit Capacity: Basic Calculations and Transformer Sizing
Need a transformer? Medium Voltage Cast Resin and Oil Immersed are available here
Short Circuit Capacity: Basic Calculations and Transformer Sizing
Copyright © 2001 Francis J. Martino
Short circuit capacity calculation is used for many application... | 5 | [
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Math Help
June 6th 2007, 04:38 AM #1
Newbie
Joined
Jun 2007
Posts
9
triangle PQR is a right triangle in the Cartesain plane with right angle at R.P = (-2,1), Q = (4,3) and R lies vertically above P. the midpoint of PQ is M.
WHITCH ONE OF THE FOLLOWING IS/ARE TRUE?
A. R=(-2,3)
B. M=(1,2)
... | 4 | [
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Riemman Sum
The limit as x approches infinity of the sum from i=1 to n of : $(1+\frac{i}{n})^3$
$\lim_{n\rightarrow\infty}\sum_{i=1}^n(1+\frac{i}{n })^3$ = $\lim_{n\rightarrow\infty}\sum_{i=1}^n\frac1{n^3}(n ^3+3n^2i+3ni^2+i^3)$= $\lim_{n\rightarrow\infty} 1+\frac3n\sum_{i=1}^ni+\frac3{n^2}\
sum_{i=1}^ni^2+ \frac3{n^3... | 5 | [
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Posts from September 2011 on Code and Football
The latest and greatest. I’m still curious how deep into the season we’ll get before the optimal pythagorean exponent will fall below 3. Oakland, for now, is the SRS leader because of an exceptional
strength of schedule.
I can now calculate a Homemade Sagarin, but not hap... | 4 | [
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Patente US20040083082 - Iterative detection in MIMO systems
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] Priority is claimed from provisional applications: appl. Ser. Nos. 06/395,604, filed Jul. 12, 2002, and 06/399,746, filed Jul. 30, 2002. The following copending applications disclose related
subject matter and ha... | 4 | [
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Diagonalise Symmetric Matrix.
May 17th 2008, 09:08 PM
pearlyc
Diagonalise Symmetric Matrix.
Diagonalise,
$A$ = $\left[ \begin{array}{cccc} -2 & -1 & 0 \\ -1 & 0 & 1 \\ 0 & 1 & 2 \end{array}\right]$
That is find matrices P and D, where D is diagonal such that
P-1 AP = D
May 17th 2008, 09:15 PM
I... | 5 | [
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Math Help
November 18th 2012, 10:03 PM #1
Newbie
Joined
Nov 2012
From
US
Posts
5
Proofs -_____-
Can anyone help me prove the following?
Suppose S is a set of numbers which contain exactly one element, then S is closed.
Re: Proofs -_____-
I'm not sure i understand the question. Do you mean... | 5 | [
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Non-uniform inertia
1. The problem statement, all variables and given/known data
A cylinder with radius R and mass M has density that increases linearly with radial distance r from the cylinder axis, ie. [itex]\rho[/itex]=[itex]\rho[/itex][itex]_{0}[/itex](r/R), where [itex]\rho
[/itex][itex]_{0}[/itex] is a positive ... | 5 | [
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Math Help
September 11th 2008, 05:47 AM #1
Newbie
Joined
Sep 2008
Posts
4
GCD
Hi, I am a little confused on this problem. Please help!!
Assuming gcd(a,b)=1, prove that gcd(a+b, a^2+b^2)=1 or 2
So far I know a^2 + b^2= (a+b)(a-b)+2b^2
Let $d$ be a (positive) common divider of $a^2+b^2$ and... | 4 | [
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Self-organizing Mechanism for Development of Space-filling Neuronal Dendrites
Abstract
Neurons develop distinctive dendritic morphologies to receive and process information. Previous experiments showed that competitive dendro-dendritic interactions play critical roles in shaping
dendrites of the space-filling type, wh... | 4 | [
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Project Euler Problem 89
Problem 89 was kind of fun: we needed to convert some sloppily written roman-numerals into their more efficient, minimal representations.
There are two tricks to doing this easily:
1. When converting from roman numerals to decimal digits, it is simplest to process the roman numeral from righ... | 4 | [
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Multiplication/division of matrices and vectors
Jhenrique
1) Let A a square matrix, x a colum vector and b another colum vector. So, I want solve for x the following equation: Ax=b
So: x=b÷A = b×A^-1 And this is the answer! Or would be this the correct answer x = A^-1×b ?
First of all, you shouldn't use the divisio... | 5 | [
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An introduction to fractals
An Introduction to Fractals
Definition
Fractal Dimensions
Example: Calculate Fractal Dimension
How Long is the Coast of Britian?
... | 4 | [
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Patent US7761233 - Apparatus and method for measuring the accurate position of moving objects in an indoor environment
FIELD OF INVENTION
The instant invention relates to an apparatus and method for measuring the accurate position of moving objects in an indoor environment.
BACKGROUND OF THE INVENTION
Location sensi... | 4 | [
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Patent US7908641 - Modular exponentiation with randomized exponent
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation of co-pending International Application No. PCT/EP04/00522, filed Jan. 22, 2004, which designated the United States and was not published in English and is
incorporated herein by... | 4 | [
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Proving (1+x1.t)(1+x2.t)...(1+xn.t)>=(1+t)^n.
Let x1,x2,...,xn be positive numbers satisfying (x1)(x2)(x3)...(xn)=1. Show that for any t>=0, (1+x1.t)(1+x2.t)...(1+xn.t)>=(1+t)^n.
Last edited by mr fantastic; March 7th 2011 at 10:33 AM. Reason: Re-titled.
We can show that $\dfrac{\left(1+\frac t{x_i}\right)(1+tx_i)}{(... | 5 | [
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Why it's not equal?
October 9th 2013, 07:49 AM
Mengqi
Why it's not equal?
HI all,
I encountered an integral
$\gamma(x,t)=\pi^{-0.5} \frac{x}{2} \int^t_0 t'^{-\frac{3}{2}} e^{-\frac{x^2}{4t'}} dt' = -\frac{2}{\sqrt{\pi}} \int^t_0 e^{-(\frac{x}{2\sqrt{t'}})^2} d \frac{x}{2\sqrt{t'}} = \frac{2}{\sqrt{\
... | 4 | [
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Implicit Differentiation
September 29th 2012, 06:25 AM
kspkido
Implicit Differentiation
I've tried differentiating this over again, and took me a while to get it. but Im not sure, my answer were (1/3, 4/3)
heres the question
At what point on the curve xy=(1-x-y)^2 is the tangent line parallel to the x-a... | 5 | [
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rationalize expressions
September 29th 2007, 11:16 AM #1
Newbie
Joined
Sep 2007
Posts
9
rationalize expressions
hi i was wondering if any one can help me rationalize these four expressions and if possible show working out so i can understand better, thanks in advance.
1)
8_
√2
2)
16... | 4 | [
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Some calculus problems in the assignment of Calculus 1 course
June 25th 2010, 06:53 PM #1
Newbie
Joined
Jun 2010
Posts
1
Some calculus problems in the assignment of Calculus 1 course
1) a) show that e^x >= 1 + x for x>=0
b) deduce that e^x >= 1 + x + 1/2 x^2 for x >= 0
c) use mathematical inducti... | 4 | [
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Current carrying wire and induced electric field within the wire
So I just had an exam and I'm so unsure about this problem. It seems that I got it right, but I could be completely wrong. XD
1. The problem statement, all variables and given/known data
A long, straight current-carrying wire carries an increasing curre... | 4 | [
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Numerical Solution of a Kind of Fractional Parabolic Equations via Two Difference Schemes
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 828764, 8 pages
http://dx.doi.org/10.1155/2013/828764
Research Article
Numerical Solution of a Kind of Fractional Parabolic Equations via Two Difference Schemes
^1Ins... | 5 | [
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Physics Forums - Correction on 9.73 Statistics on Large Sample Tests of Hypotheses?
Little Bear Oct13-07 02:28 PM
Correction on 9.73 Statistics on Large Sample Tests of Hypotheses?
1. The problem statement, all variables and given/known data
(I forgot to write out the problem statement in previous post)
How do C... | 5 | [
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Patent US6240141 - Lower-complexity peak-to-average reduction using intermediate-result subset sign-inversion for DSL
RELATED APPLICATIONS
Provisional applications, Ser. No. 60/084,895 filed May 9, 1998, and Ser. No. 60/094,734 filed Jul. 31, 1998 have been filed on this application.
FIELD OF THE INVENTION
This inve... | 4 | [
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Forces of interest
September 1st 2009, 06:33 PM
tbl9301
Forces of interest
Tawny makes a deposit into a bank account that credits interest at a nominal interest rate of 10% per year, compounded semiannually. At the same time, Fabio deposits 1000 into a different bank
account, which is credited with simple in... | 5 | [
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... | 19,228 | 19228 | |
Check my working please.
August 14th 2009, 01:54 AM #1
Member
Joined
Jul 2009
Posts
149
Check my working please.
Differentiate these.
$y = \frac{1}{\sqrt{1-5x^2}}$
$=(1-5x^2)^\frac{-1}{2}$
$=-\frac{1}{2} (1-5x^2)^\frac{-3}{2} (-10x)$
$=\frac{5x}{\sqrt{(x^2-5)}^3}$
Next
$y =... | 5 | [
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Nonlinear Differential Equation
October 13th 2012, 04:32 PM #1
Nonlinear Differential Equation
The Question is:
Solve the following equation. The constant $\mu$ is non negative and $h$ is greater than zero.
${ ( \frac{dr}{dt} ) }^2 = \frac{2\mu}{r} + 2h$
Any help would be apperciated as I'm not ent... | 5 | [
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... | 19,230 | 19230 | |
Complex Circle Geometry
May 23rd 2009, 09:08 AM #1
Newbie
Joined
Jan 2009
Posts
18
Complex Circle Geometry
I am trying to show that the points 1, a,−(a*), 1/a in the complex plane lie on a circle. Where a* is the conjugate of a.
I know that given four points A,B,C,D then they lie on a circle iff
... | 4 | [
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0.0... | 19,231 | 19231 | |
Product rule in terms of implicit differentiation
October 5th 2009, 07:11 AM #1
Banned
Joined
Sep 2009
Posts
35
Product rule in terms of implicit differentiation
1) x^2 + xy - y^2 = 4
x^2 + x*y(x) - y(x)^2 = 4
I understand this much: 2x + ____ + 2y*(dy/dx) = 0
But I don't understand how to d... | 4 | [
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0.049316406... | 19,232 | 19232 | |
Advanced Probability Help!!!
April 16th 2008, 02:46 PM #1
Junior Member
Joined
Apr 2008
Posts
40
Advanced Probability Help!!!
Peter was given n one-dollar scratch tickets, each winning:
$2 with probability 1/8
$10 ------------- 1/100
$1000 ----------- 1/10,000
$20000 ---------- 1/1,000,0... | 5 | [
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On the Self-Intersection Local Time of Subfractional Brownian Motion
Abstract and Applied Analysis
Volume 2012 (2012), Article ID 414195, 27 pages
http://dx.doi.org/10.1155/2012/414195
Research Article
On the Self-Intersection Local Time of Subfractional Brownian Motion
^1School of Mathematics and Statistics, Nanjin... | 4 | [
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IVP -variation of parameters
November 3rd 2009, 01:19 PM
matlabnoob
IVP -variation of parameters
ok so here is my *big* problem im stuck on..=[
thank you for your time reading this
dx/dt + x/t - 1 = t^2 ; x(1) = 1
using variation of paramter i did all this:
dx/dt + x/t = t^2 + 1
dx/dt+ x... | 5 | [
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Conic Equation
May 11th 2010, 11:35 PM #1
Member
Joined
Jan 2010
Posts
142
Conic Equation
Can you help me prove if true or false please:
True or False? Every system of two conic equations whose xy-term is nonexistent has at most 4 points of intersection. graph is not a proof.
Thanks!
Hello... | 4 | [
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... | 19,236 | 19236 | |
[SOLVED] calc2 major help please!
September 30th 2008, 06:20 PM #1
Member
Joined
Apr 2008
Posts
171
[SOLVED] calc2 major help please!
ok so basically we are doing lengths and planes of curves.. i m lost to how the solution manual gets this..
the get:
f '(x) = x (x^2 + 2)^ 1/2
= integral ... | 5 | [
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Patent US5457805 - Microcomputer enabling high speed execution of product-sum operation
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a microcomputer, and particularly relates to a microcomputer having a product-sum operation instruction which repeats multiplication and additi... | 4 | [
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-0.053222... | 19,238 | 19238 | |
Partial Fractions Question
Hi
Need help on the following questions:
1) Resolve into partial fractions: $\frac{x^2-x+1}{(4x^2-1)(x-2)}$
This is what i have done:
$\frac{x^2-x+1}{(4x^2-1)(x-2)}$ => $\frac{x^2-x+1}{(x-2)(2x-1)(2x+1)}$
$\frac{A}{(x-2)}+\frac{B}{(2x-1)}+\frac{C}{(2x+1)}$
$A(2x... | 4 | [
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Find eq. to ellipse
November 3rd 2006, 10:17 AM
viet
Find eq. to ellipse
Find the equation of the line that is tangent to the ellipse
b^2x^2 + a^2y^2 = a^2b^2 in the first quadrant and forms with the coodiante axes the triangle with smallest possible area (a and b are positive constants)
im not sure how... | 5 | [
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-0.03955078... | 19,240 | 19240 | |
Perpendicular line equation!
December 12th 2009, 12:20 PM #1
Newbie
Joined
Dec 2009
Posts
4
Hi There!
Was hoping for some help.
Set up an equation for the line (2,3) which is perpendicular to the line (2, -1) and (-1.-3). Don't understand this at all. Can someone please help me?!
Thx!
... | 4 | [
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0.02209... | 19,241 | 19241 | |
What is the latest on the Group Extension Problem?
lugita15
Good one. OK, can you tell me the general conditions in which extensions are split or not split, or equivalently the conditions under which they are semidirect products or not?
And do you know anything about the current state of knowledge concerning the ge... | 4 | [
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0.0030670166... | 19,242 | 19242 | |
Speed of skydiver
If a person has reached terminal velocity (say 50m/s), and he opens his parachute, and I want to find his speed 2 seconds after he opens his parachute, can I do this?
Solve the equation m dv/dt = mg - kv^2 and substitute k with 1/2 pCdA and substitute the value for p, Cd, and A to find velocity?
If ... | 4 | [
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Patent US7266579 - Combined polynomial and natural multiplier architecture
TECHNICAL FIELD
The present invention relates to semiconductor integrated circuit architectures, in particular multiplication circuits.
BACKGROUND ART
Multiplication hardware is usually adapted to carry out natural multiplication (the normal ... | 4 | [
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Working with moving pulleys
A pulley system may comprise of smaller component pulley systems. Take the case of a pulley system, which consists of two component pulley systems (“B” and “C”) as shown in the figure.
Figure 1: The
pulley system
comprises of two
component pulley
systems.
Mixed pulley system
T... | 4 | [
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of a Two-Language Competitive Model with Control Strategies
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 654619, 13 pages
http://dx.doi.org/10.1155/2013/654619
Research Article
Dynamic Analysis of a Two-Language Competitive Model with Control Strategies
^1College of Mathematics and Systems Sc... | 5 | [
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Log equation is this correct?
10^(1-x) = 6 ^(x) I got: log10 / log6 + log10 = x or x = .562
Last edited by needhelp75; December 16th 2008 at 11:14 PM.
$10^{1-x} = 6^x$ $\Rightarrow \frac{10^1}{10^x} = 6^x$ $\Rightarrow 10 = 6^x \times 10^x$ $\Rightarrow 10 = 60^x$ $\Rightarrow x\ln60 = \ln 10$ $\Rightarrow x = \frac{... | 4 | [
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Physics Forums - (special relativity)Trajectory under constant ordinary force
hoyung711 May11-10 12:27 AM
(special relativity)Trajectory under constant ordinary force
1. The problem statement, all variables and given/known data
A particle is subject to a constant force F on +x direction. At t = 0, it is located... | 4 | [
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Radian Question.
January 13th 2011, 02:02 PM
Mike012
Radian Question.
Just got done reading the chapter... Want to make sure I have this right....
IF Circumference = 2(pi)r
Let cir = 360 deg.
So that 360 deg = 2(pi)r
And 180 deg = (pi)r
IF r = 10
then 180 = (pi)10
Hence half of a ... | 4 | [
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Definite integral question
March 3rd 2013, 09:44 PM #1
Member
Joined
Dec 2012
From
NY
Posts
105
Thanks
1
Definite integral question
Integral from 0 to 1 (1-x)^9
I did u substitution
u=1-x
du=-1dx
du/-1 =dx
get new intervals
1-1=0
1-0=1
-1 integral u^9 du
-1 ... | 5 | [
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0.0201416015625,
-0.1025... | 19,250 | 19250 | |
Inverse Rotation Matrix
October 31st 2010, 11:05 AM #1
Newbie
Joined
Oct 2010
Posts
8
Inverse Rotation Matrix
Hi,
I'm totally new to this forum so please forgive me if I'm posting this in a wrong folder. I'm working on robotics and I'm currently running in to some rotation problems which kinda run o... | 5 | [
-0.087890625,
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0.06494140625,
-0.09814453125,
-0.021850585937... | 19,251 | 19251 | |
mgf of a discrete random variable
October 18th 2009, 07:44 AM #1
Member
Joined
Mar 2009
Posts
133
mgf of a discrete random variable
A discrete random variable has pdf $p(y)=bk^y, y=0,1,2,...$
Find Y's mgf $m(t)$ generally.
I get a bit stuck on what to do..
I know that $m(t)=E(e^{ty})$
so... | 5 | [
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0.00518798828125,
0.00775146... | 19,252 | 19252 | |
Math Help
Find the value of x, y, and z reduced to the simplest radical form.
ok, because i ws wondering what x, y, and z are you talking about? so by Pythagoras' theorem: x = sqrt(y^2 - 4^2) and also x = sqrt(z^2 - 2^2) => sqrt(y^2 - 4^2) = sqrt(z^2 - 2^2) => y^2 - 16 = z^2 -
4 => y^2 - z^2 = 12 ..................(1... | 4 | [
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0.048828125,
-0.043701171875,
0.00120544433593... | 19,253 | 19253 | |
colouring vertices in graph theory
December 1st 2009, 09:44 PM #1
Newbie
Joined
Nov 2009
Posts
11
Compare the upper bound for the chromatic number given by Brooks' theorem with the correct value for
i) the Petersen Graph
ii) the k-cube Qk
the answer is:
i) upper bound = 3, chromatic numb... | 5 | [
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0.0185546875,
0.00384521484375,
0.09521484375,
0.045166015625,
-0.067871... | 19,254 | 19254 | |
How to interpret physically the divergence of vector field?
hanson
... but I find no clue why the divergence of an electric field measures the charge denity?
Can anyone tell me how to interpret the divergence of a vector field? Please kindly help.
as other's pointed out, this has to do with Gauss's Law. it is a di... | 4 | [
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... | 19,255 | 19255 | |
Matrix/basis question
December 22nd 2010, 12:09 PM
worc3247
Matrix/basis question
I can see that this is true but I am having trouble presenting a convincing argument.
Let V = $M_{n\times n} (\mathbb{R})$. Show that V has a basis with the property that each matrix in the basis is either symmetric or skew sym... | 5 | [
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... | 19,256 | 19256 | |
Find the extrema of a trigonometric function
November 15th 2009, 08:20 AM #1
Junior Member
Joined
Apr 2009
Posts
37
Find the extrema of a trigonometric function
I am to find the extrema of the following function. f(x) = 2 sin x + cos 2x when 0 < x < 2pi. taking the derivative of the function I come up wi... | 4 | [
0.01318359375,
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0.12158203125,
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0.0625,
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0.0186767578125,
0.06884765625,
0.00653076171875,
0.0361328125,
-0.04907... | 19,257 | 19257 | |
Taylor serie of a function 1/(1+Z^2)
Okay, do you have a [b]question[/b}? What do you want to know about that function?
If you are asking about how to get that series, you could, of course, find the derivatives of that function, and apply the usual formula for Taylor's series.
However, for this particular function, t... | 5 | [
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-0... | 19,258 | 19258 | |
Quadratic questions : rational roots problem
March 30th 2009, 11:37 AM #1
Member
Joined
Nov 2008
Posts
171
Quadratic questions : rational roots problem
consider a quadratic equation (a+c-b)x^2 + 2cx + (b+c-a) = 0, where a,b,c are distinct real numbers and a+b-c is not equal to 0. Suppose that both the ro... | 4 | [
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-0.0132446... | 19,259 | 19259 | |
Feynman's Calculus
murshid_islam
Feynman wrote in his book ‘Surely You’re Joking, Mr. Feynman!’:
“That book [Advanced Calculus, by Woods] also showed how to differentiate parameters under the integral sign – it’s a certain operation. It turns out that’s not taught very much in the universities;
they don’t emphasize i... | 5 | [
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directional derivative q
ok so heres the question: find the directional derivative of the function f(x,y,z)=xy+yz+zx at the P(3,-3,4) in the direction of Q(7,1,7)...
Here's what I have done:
found partial derivatives and added them to give the gradient
(y+z)i+(x+z)j+(y+x)k
plugging in P gives: (-3+4... | 4 | [
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-... | 19,261 | 19261 | |
Derivative of y = sin x * cos x
I'm working through Kline's Calculus book, and am at the chapter on Integration on Differentiation of Trig Functions. A question asks to find the derivative of:
(I've labeled all equations for easy reference)
(1) y = sin x * cos x
unlike the solution guide which advocates using the pr... | 5 | [
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-... | 19,262 | 19262 | |
Linear first order differential equations
I need to solve the equation:
x (dy/dx) + 5y = 7x where y(1) = 7/2
The correct answer i have recieved is y = 7/6 (x + 2x^-5)
How do i get to this answer?
Ive been given this as a hint:
x (dy/dx) + ay = bx^n can be simplified by multiplying both sides... | 4 | [
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A Diary of Numbers
Long before we had cars we had horse drawn carriages. Doesn’t this mean that we should also have had bird drawn planes? How many pigeons would it take to carry a 747?
According to Wikipedia, the Boeing 747 has a maximum take-off weight of 442,000 kg (~975,000 lbs). Since birds build nests, we know ... | 5 | [
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show compactness
September 20th 2011, 09:12 PM #1
Member
Joined
Dec 2008
Posts
154
show compactness
Let $\mathbf{X}$= $L^2(\mathbf{N})$= $\{\ x=\{\ x_n \}\ | \sum_{n=1} ^\infty = x_n ^2 < \infty \}$, $\| x \| = ( \sum_{n=1} ^\infty x _n ^2 )^{1/2}$ and $\mathbf{K} \subset \math{X}$ be closed
and boun... | 5 | [
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... | 19,265 | 19265 | |
System of linear equations
May 9th 2012, 03:50 PM #1
Junior Member
Joined
May 2012
From
NH
Posts
26
System of linear equations
Find all solutions to the following system of linear equations:
(x1) – 2(x2) – (x3)+(x4)=1
2(x1) – 3(x2) + (x3) – (x4)=6
3(x1) – 3(x2) + 6(x3))=15
(x1) + 5(x3... | 5 | [
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-0.0211... | 19,266 | 19266 | |
Finite Element Modeling of a Piezoelectric Composite Beam and Comparative Performance Study of Piezoelectric Materials for Voltage Generation
ISRN Materials Science
Volume 2012 (2012), Article ID 921361, 11 pages
http://dx.doi.org/10.5402/2012/921361
Research Article
Finite Element Modeling of a Piezoelectric Composi... | 4 | [
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0.0825195... | 19,267 | 19267 | |
Triangle
November 23rd 2010, 10:02 AM
Veronica1999
Triangle
In triangle ABC, angle C is a right angle and CB>CA. Point D is located on BC so that angle CAD is twice angle DAB.
If AC/AD = 2/3, then CD/BD = m/n, where m and n are relatively prime positive integers. Find m+n
All I have is the sketch.
I... | 4 | [
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Prove a group is isomorphic to another
February 8th 2010, 07:34 AM #1
Newbie
Joined
Feb 2010
Posts
14
Prove a group is isomorphic to another
Let $G$ and $H$ be groups and let [tex] G^\star [tex] be the subset of $G X H$ consisting of all $(a, e)$ with $a \in G$
Show the following:
1. $G^\star \... | 5 | [
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... | 19,269 | 19269 | |
Patent US4882758 - Method for extracting formant frequencies
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for extracting formant frequencies from vowels or voiced consonants of a speech sound.
2. Description of the Prior Art
It is known that the formant frequency i... | 4 | [
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Zero-Divisor Graphs with respect to Ideals in Noncommutative Rings
ISRN Discrete Mathematics
VolumeΒ 2011Β (2011), Article IDΒ 459547, 7 pages
http://dx.doi.org/10.5402/2011/459547
Research Article
Zero-Divisor Graphs with respect to Ideals in Noncommutative Rings
^1Department of Mathematics, University of Guilan, P... | 5 | [
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Patente US5237523 - Flowmeter fluid composition and temperature correction
CROSS REFERENCE TO RELATED APPLICATION
Reference is made to copending allowed application Ser. No. 07/285,897 filed Dec. 16, 1988 , now U.S. Pat. No. 4,961,348 issued Oct. 9, 1990 and assigned to the common assignee of the present
application.
... | 4 | [
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0.15... | 19,272 | 19272 | |
hypothesis test for mean less than number
April 6th 2011, 07:33 AM
Caption12
hypothesis test for mean less than number
a sample of 16 egg is take froom normal disribution. variance is unknown
sample mean xbar is 4.49 and sample st dev, s, is 1.231
you wish to do a test if the population mean is less than... | 4 | [
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-0.... | 19,273 | 19273 | |
Length of the column where buckling is likely to occur
pongo38
The question seems to be a tube. IN that case there are at least two modes of buckling. First, there is the overall buckling of the member as if it were a long thin rod and Euler's formula might be
said to apply. But this could be preceded by a local buc... | 4 | [
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0.06591796875,
-0.0568847656... | 19,274 | 19274 | |
Birthdays in the Same Month
1. The problem statement, all variables and given/known data
How many people have to be in a room in order that the probability that at least two of them celebrate their birthday in the same month is at least 1/2? Assume that all possible monthly outcomes are
equally likely.
2. Relevant eq... | 5 | [
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-0... | 19,275 | 19275 | |
Method and apparatus for fine resolution brushless motor control - Patent # 6744230 - PatentGenius
Method and apparatus for fine resolution brushless motor control
6744230 Method and apparatus for fine resolution brushless motor control
Patent... | 4 | [
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... | 19,276 | 19276 | |
More p.m.f [p.d.f.] questions!
September 24th 2008, 09:35 AM
Chris L T521
More p.m.f [p.d.f.] questions!
I think I have the hang of this now, but I have a minor question:
I am to find the constant $c$ which would make $f(x)$ satisfy all the conditions of being a p.m.f.
$f(x)=c(1/4)^x;~~~x=1,2,3,...$
... | 4 | [
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-0... | 19,277 | 19277 | |
Tap A can fill a tank in 36 minutes, Tap B can fill the same
Author Message
TAGS:
Tap A can fill a tank in 36 minutes, Tap B can fill the same [#permalink] 27 Sep 2012, 09:21
... | 4 | [
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0.025390625,
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0.03857421875,
-0.019775390625,
... | 19,278 | 19278 | |
Patent US6553293 - Rear steering control for vehicles with front and rear steering
TECHNICAL FIELD OF THE INVENTION
The present invention relates generally to vehicular rear-wheel steering control. More particularly, the invention relates to enhanced transient response for vehicles with active rear steering.
BACKGROU... | 4 | [
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0.0578613281... | 19,279 | 19279 | |
Double Angle help? (:
January 27th 2010, 05:40 AM
TeriyakiDonnQ
Double Angle help? (:
Hiii~
I don't understand the double angle identity~ Can anyone explain to me? :3
So i'm given
cos81sin81
and i don't know what to do with it. I have the answers and it says it's 1/2sin162.
I don't unders... | 4 | [
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0.031738... | 19,280 | 19280 | |
Unstable ODE
muzialis
Hello there,
I am solving numerically the ODE
$$ \dot{y} = min \, (y, A) + B\, sin(t)$$ , A,B being constant.
I obtain a very "wiggled" solution which is very fine to me actually, as it echoes the problem I am studying.
However, as the numerical solution scheme is quite "rudimentary" I am wo... | 5 | [
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0.06884765625,
... | 19,281 | 19281 | |
Maths question that needs to explained to 10 year old
December 29th 2008, 08:58 AM #1
Newbie
Joined
Dec 2008
Posts
21
Maths question that needs to explained to 10 year old
This is question which has to be explaine to a 10 year old.
6 lollies and 3 ice creams cost 8.52
3 icecreams and 6 drinks co... | 4 | [
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0.054931640625,
-0.041259765625,
0.0167236328125,
-0.03564453125,
-0.06494140625,
0.0218505859375,
-0.01177978515625,
0.0277099609375,
-0.0274658203125,
0.00518798828... | 19,282 | 19282 | |
showing convergence of a function recursion relation
up vote 1 down vote favorite
I have obtained (formally) a perturbative solution $$ H(y) = \sum_{n=0}^\infty \delta^n H_n(y) $$ to the following integro-differential equation ($\delta$ is a small constant, $\nu$ is a L\'evy
measure and $F$ is a function of $y$) $$ 0 ... | 4 | [
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-0.0546875,
-0.0264892578125,
-0.0205078125,
-0.0229492187... | 19,283 | 19283 | |
Limit of a sequence of sets: hypercubes.
Ok, so I would like to formally settle this one. I have a sequence of sets [itex]C_{N}^{n}\subset\mathbb{R} ^{n}, N\in\mathbb{Z} ^{+}[/itex] defined as follows
[tex]C_{N}^{n}:=\left\{ \left( x_{1}, ..., x_{n}\right) \in\mathbb{R} ^{n}: \sum_{j=1}^{n} x_{j}^{2N} \leq n \right\} ... | 4 | [
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-0.05029296... | 19,284 | 19284 | |
Problems with some integration
July 21st 2006, 10:54 PM #1
Senior Member
Joined
Jul 2006
Posts
364
Problems with some integration
Hi, im new here, I have some problems with the following integrations:
I've tried various things with all of them, but cant figure them out. I'd love some pointers, hopefu... | 5 | [
-0.0341796875,
-0.0732421875,
-0.0576171875,
-0.0291748046875,
-0.060302734375,
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-0.0026702880859375,
-0.03466796875,
-0.0111083984375,
-0.01171875,
0.0174560546875,
0.0027008056640625,
-0.030517578125,
-0.0089111328125,
0.006683349609375,
0.0076904296875,
0.04125976562... | 19,285 | 19285 | |
Falling towards Forgetfulness: Synaptic Decay Prevents Spontaneous Recovery of Memory
Abstract
Long after a new language has been learned and forgotten, relearning a few words seems to trigger the recall of other words. This “free-lunch learning” (FLL) effect has been demonstrated both in
humans and in neural network ... | 4 | [
-0.000720977783203125,
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0.00958251953125,
0.0234375,
0.064453125,
-0.08056... | 19,286 | 19286 | |
Word prob.
October 12th 2007, 01:41 PM
kwivo
Word prob.
A particle in a magnetic field travels in a straight line. The force (in Newtons) acting upon it is given by the function
F(s) = square root of (s) −s^2, where s = f(t), the position of the particle in meters, changes with time t. At what rate is the fo... | 4 | [
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0.046875,
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-0.0013885498046875,
-0.07177734375,
0.037353515625,
-0.037841796875,
-... | 19,287 | 19287 | |
Integration by separation of variables
May 23rd 2009, 04:32 PM #1
Member
Joined
May 2008
From
Melbourne Australia
Posts
203
Thanks
15
Integration by separation of variables
$\rho \frac {du}{d \rho}=1-e^u$
Use separation of variables to obtain:
$e^u=\frac 1 {1-\frac{c_2} \rho}$
When... | 5 | [
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-0.09130859375,
-0.04296875,
-0.02770... | 19,288 | 19288 | |
Pulley Torque calculations
You're not thinking you can amplify power with a pulley, are you...?
No, I understand that power is constant through the belted drive, the torque and speed change to keep this constant.
Bandit127, you hit on my though exactly with your example
The resultant force will not - it will vary in... | 4 | [
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... | 19,289 | 19289 | |
Physics Forums - Matrices in Matlab
sara_87 Jan29-07 04:27 AM
Matrices in Matlab
Question 1:
Solve the system of equations
-w + 3x - 2y + z = 1
w + 2x - 4y - 3z = 2
x + 2y + z = 4
2w + 3x - y - z = 7
The attempt at a solution
To do this in matlab, this is what I will did:
>> A=[-1,3,-2,1;1,2,-4,-3;0,1,2,1;2,3... | 4 | [
-0.11376953125,
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0.0712890625,
-0.1123046875,
-0.09814... | 19,290 | 19290 | |
Please solve these
April 4th 2008, 07:58 PM #1
Newbie
Joined
Apr 2008
Posts
1
Please solve these
Q1. By how many % will the s.a of the cube increase if each side is doubled?
Q2. A circle of radius 7cm is divided into two sectors by cutting 120 degree sector from the centre.The 2 sectors are used to ... | 4 | [
-0.00506591796875,
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0.0537109375,
-0.001495361328125,
0.0005950927734375,
-0.0203857421875,
-0.064453125,
0.018798828125,
0.09765625,
0.056396484375,
0.0038909912109375,
-0.0488281... | 19,291 | 19291 | |
Probabilty ans statistics
July 4th 2006, 12:25 AM #1
Junior Member
Joined
Mar 2006
Posts
46
Probabilty ans statistics
A random variable with normal distribution with unknown mean u and variance 2.25. with a suitable value of u. find the greatest value of P(10.9<X<12.1)
guess
A random variable w... | 5 | [
-0.045166015625,
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-0.0859375,
0.030029296875,
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0.06640625,
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0.01470947265625,
-0.00811767578125,
-0.032470703125,
0.08837890625,
-0.046386... | 19,292 | 19292 | |
MathGroup Archive: October 2002 [00143]
[Date Index] [Thread Index] [Author Index]
Re: Re: Accuracy and Precision
• To: mathgroup at smc.vnet.net
• Subject: [mg37022] Re: [mg36983] Re: Accuracy and Precision
• From: Daniel Lichtblau <... | 5 | [
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0.... | 19,293 | 19293 | |
Family of curves on a surface (Differential geometry)
May 11th 2008, 04:09 PM
Tchakra
Family of curves on a surface (Differential geometry)
Here is a question i am not sure how to tackle, I am not familiar with how to deal with family of curves and don't really have much time to look around for the definition as... | 4 | [
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-0.0033111572265625,
-0.10888671875,
-0... | 19,294 | 19294 | |
Rms current in circuit with capacitor resistor and rms output
1. The problem statement, all variables and given/known data
A 39.5 uF capacitor is connected to a 47.0 ohm resistor and a generator whose rms output is 25.2 V at 60.0 Hz. Calculate the rms current in the circuit.
(also asks for voltage drop across resistor... | 4 | [
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-0.09423828125,
0.030... | 19,295 | 19295 | |
Geodesic of a Sphere in spherical polar coordinates (Taylor's Classical Mechanics)
1. The problem statement, all variables and given/known data
"The shortest path between two point on a curved surface, such as the surface of a sphere is called a geodesic. To find a geodesic, one has to first set up an integral that g... | 4 | [
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0.011413... | 19,296 | 19296 | |
2 Ball Bearings in a Tapering pipe
August 23rd 2011, 05:57 AM
Dcoz
2 Ball Bearings in a Tapering pipe
Hi,
I'm new here and after any help that can be given. I've finally decided to throw in the towel on a few questions and ask for help on them. This question is from a revision sheet handed out in
class.... | 4 | [
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... | 19,297 | 19297 | |
Motion - Please, any help???
April 24th 2010, 06:46 AM
Sunyata
Motion - Please, any help???
A large stone is falling through a layer of mud and its depth x m below ground level at time t minutes is given by x = 12 - 12e^(-0.5t). How long will it take the stone to reach within 1 mm of
its final position?
Apr... | 5 | [
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0.021606... | 19,298 | 19298 | |
Extended Euclid's algorithm - multiplicative inverse
November 11th 2010, 09:40 PM #1
Junior Member
Joined
May 2010
Posts
26
Extended Euclid's algorithm - multiplicative inverse
Hi All,
Having trouble with using Extended Euclid's algorithm to find multiplicative inverses.
I dont understand the al... | 5 | [
-0.05908203125,
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... | 19,299 | 19299 |