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|---|---|---|---|---|---|
Differentiation Applications 2
November 28th 2007, 02:00 AM #1
Junior Member
Joined
Mar 2007
Posts
34
Differentiation Applications 2
I have two more quick questions:
The sum of two numbers is 10. What are the two number if the sum of their squares is a minimum?
What numbers, when squared and ad... | 5 | [
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How to Calculate the Wronskian | The Classroom | Synonym
The Wronskian is a determinant formulated by Polish mathematician and philosopher Józef Maria Hoëne-Wroński. It is used to find if two or more functions are linearly independent. Functions that are
linearly dependent are multiples of each, whereas linearly indepe... | 5 | [
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Algebra, Problems For Fun (15)
June 7th 2009, 01:59 PM #1
MHF Contributor
Joined
May 2008
Posts
2,295
Thanks
7
Algebra, Problems For Fun (15)
Let $R$ be a ring (not necessarily with identity element). Suppose that $(x^2-x)y=y(x^2-x),$ for all $x,y \in R.$ Prove that $R$ is commutative.
Last edit... | 5 | [
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Proof of a lemma
April 29th 2009, 03:48 AM #1
Proof of a lemma
Lemma: Let a and n be integers with hcf(a,n)=1. Then
n divides ab if and only if n divides b.
I'm still not that brilliant at proving things and i'm having trouble with this lemma.
I started with $hcf(a,n)=1 \Rightarrow \ \exists u,v \i... | 4 | [
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Parallel vectors? and vector sum questions
January 26th 2009, 07:09 AM #1
Member
Joined
Oct 2007
Posts
159
Parallel vectors? and vector sum questions
I have two vectors: t i - j + k and ti + t j -- 2k t is some coefficient. I know that to make these vectors perpendicular t = 2 but I am asked whether ther... | 4 | [
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Physics Forums - View Single Post - Finding the equation of the intersection
cdot9
1. The problem statement, all variables and given/known data
Plane 1:2x-3y+8z=7
Plane 2:x-8y+z=14
Plane 3:5x-14y+17z=28
2. Relevant equations
N/A
3. The attempt at a solution
I took plane 1 and subtracted (plane 2)x2 to get
13y+6z... | 4 | [
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[Probability] Seating arrangement & Selection
November 20th 2009, 07:36 PM #1
Newbie
Joined
Nov 2009
Posts
3
[Probability] Seating arrangement & Selection
PROBLEM 1
7 people sit in a row, and 2 of them want to sit together, in how many ways can they be arranged?
ATTEMPTED SOLUTION:
6! x 2 = ... | 4 | [
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Does the integer k have a factor p such that 1<p<k?
Author Message
TAGS:
Does the integer k have a factor p such that 1<p<k? [#permalink] 19 Jun 2010, 02:49... | 4 | [
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Vector applications help
June 18th 2010, 06:19 PM #16
Hmm. I may have started you down a path that's more work. Try eliminating the trig functions. How, might you ask? By solving each equation for the trig function, squaring everything in sight,
adding one to the other to get 1. So, for example,
$\cos(\th... | 4 | [
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Physics Forums - What exactly is an inertial reference frame?
vanhees71 Jan20-13 03:37 AM
Re: What exactly is an inertial reference frame?
First of all, one should be clear about the fact that the existence of a (globel) inertial frame (and then arbitrarily many inertial frames which all move uniformly against eac... | 4 | [
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Irrationality of
The Irrationality of
Problem:
Prove that
Solution:
The number,
for a and b = any two integers. To show that eq. 1:
From eq. 2a, we must conclude that a^2 (and, therefore, a) is even; b^2 (and, therefore, b) may be even or odd. If b is even, the ratio a^2/b^2 may be immediately reduced by cancelin... | 4 | [
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How to calculate ((a+b)!/a!b!) mod p
May 2nd 2009, 03:07 AM #1
Newbie
Joined
Apr 2009
Posts
11
How to calculate ((a+b)!/a!b!) mod p
Hi
I am looking for an efficient way to calculate ((a+b)!/a!b!) mod p. p is prime.
for example if a=10 and b=7 and p=3 then we need to find (17!/10!.7!) mod 3
... | 5 | [
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3D stress -strain relationship
(But I'm intending to write stress as function of strain)
you do this by solving (inverting) my matrix equation
ε=Cσ
this is possible and leads to
[tex]\begin{array}{l}
{\sigma _x} = A\left[ {{\varepsilon _x} + B\left( {{\varepsilon _y} + {\varepsilon _z}} \right)} \right] \\
{\sigm... | 4 | [
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Conditional Probability #2
April 22nd 2009, 08:52 PM #1
Junior Member
Joined
May 2007
Posts
36
Conditional Probability #2
A store has two gumball machines, which are stocked with maroon and gold gumballs. One machine has 100 maroon gumballs and 150 gold gumballs. The other has 150 maroon gumballs and 200... | 4 | [
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The desired exam question paper (probability question)
August 24th 2011, 10:55 PM
Narek
The desired exam question paper (probability question)
There is an exam. There are 25 exam question papers for 25 students who are lined up outside of the classroom. Each time, a students gets into the classroom, pick one pap... | 4 | [
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Optimal Stimulus Shapes for Neuronal Excitation
Abstract
An important problem in neuronal computation is to discern how features of stimuli control the timing of action potentials. One aspect of this problem is to determine how an action potential, or
spike, can be elicited with the least energy cost, e.g., a minimal ... | 4 | [
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Patent US4633398 - Attenuation compensated emission reconstruction with simultaneous attenuation factor evaluation
This invention relates to emission computed tomography, ECT, and more particularly to attenuation compensation in ECT.
Computed tomography embraces the fields of transmission computed tomography and emiss... | 4 | [
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Geometric progression
Just a quick question; How do I show that (1+2+...+n)^2 = 1^3+2^3+...+n^3 ?
Last edited by weasley74; March 25th 2008 at 01:48 PM.
The sum on the right can be shoen to be a quartic in $n$ (construct the difference table and it becomes obviouse). Which quartic can be established by fitting the fi... | 5 | [
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Global emergent time, how does Tomita flow work?
Tomita time is an intrinsic observer-independent time variable available to us for fully general relativistic analysis. As far as I know it is the only such time available for things like
general covariant statistical mechanics
GC statistical quantum mechanics
GC quan... | 4 | [
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Physics Forums - View Single Post - Capacitors: How do they store energy ?
The math can help to understand what's going on here a lot (math is always good for understanding).
Let's first consider the most simple case of a two-plate capacitor with vacuum between its plates. Then you can think of charging it that you t... | 5 | [
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Patent US5063604 - Method and means for recognizing patterns represented in logarithmic polar coordinates
FIELD OF THE INVENTION
A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone o... | 4 | [
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Posts from August 2009 on Turing's Invisible Hand
The Netflix $1M collaborative filtering competition has ended with an outcome that is doubly-interesting. First, there was a nice “photo-finish” with two separate groups passing the prize-winning
mark and with the winner not yet announced. More interesting is the fact... | 4 | [
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The Grey Labyrinth
The Billiard Ball
Skinny must be feeling guilty for having destroyed your cue ball, because this is a bet you can win with ease.
You announce immediately that the volume of the remaining sphere is 4/3 pi cubic inches.
Why? Without thinking you immediately realize that if the problem has a solution... | 4 | [
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Post by thread:pipe organ method - water level
Truncated match.
PICList Thread
'pipe organ method - water level'
1999\01\19@232438 by Tjaart van der Walt
John Payson wrote:
>
> An open flue pipe will produce a fundamental whose wavelength is equal
> to the twice length of the pipe plus a small extra amount related to
... | 4 | [
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Physics Forums - Special relativity: 2d metric components
Special relativity: 2d metric components
An SR question again, exam on monday.
1. The problem statement, all variables and given/known data
I'm given a 2D metric as:
[tex]ds^{2}=x^{2}dx^{2}+2dxdy-dy^{2}[/tex]
I have to first find the contravariant and cov... | 4 | [
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Most force/strength used in the same time frame
Zula110100100
The average is the same, but that is not the end of the story.
I guess every post I should include: This is not likely to be how lifting weights actually works, at all.
But...lets take for example, the lowering of 100kg, over 1m, starting at the top, an... | 4 | [
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Some New Generating Functions for
Journal of Applied Mathematics
Volume 2014 (2014), Article ID 419365, 5 pages
http://dx.doi.org/10.1155/2014/419365
Research Article
Some New Generating Functions for -Hahn Polynomials
^1Basic Courses Department, Southeast University Chengxian College, Dongda Road, Pukou, Nanjing 2... | 5 | [
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Some New Lacunary Strong Convergent Vector-Valued Sequence Spaces
Abstract and Applied Analysis
Volume 2014 (2014), Article ID 858504, 8 pages
http://dx.doi.org/10.1155/2014/858504
Research Article
Some New Lacunary Strong Convergent Vector-Valued Sequence Spaces
^1Department of Mathematics, Aligarh Muslim Universit... | 4 | [
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Linear algebra
May 16th 2007, 04:47 PM #1
Newbie
Joined
Oct 2006
Posts
3
Linear algebra
Suppose that you are given the following system of linear equations
[variables are x1, x2, x3 and x4]
x1 + 3x2 + 9x3 + 2x4 =5
x1 + 3x3 - 4x4 =5
x2 + 2x3 + 3x4 =-1
-2x1 + 3x2 + 5x4 =-1
What is... | 4 | [
-0.04345703125,
-0.041259765625,
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0.0947265625,
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0.04541015625,
0.052734375,
-0.006011962890625,
0.07177734375,
-0.049560546875,
-0.057373046875,
0.04541015625,
-0.05810546875,
-0.08984375,... | 20,528 | 20528 | |
solving linear congruences...please help
October 30th 2010, 12:05 AM
Dreamer78692
solving linear congruences...please help
Attachment 19522
for (e) and (f).... I dont know how to solve such congruences, I only know how to get to an answer when I check for different values of x.... (Crying)
(g) I can do... | 5 | [
-0.056884765625,
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0.000102996826171875,
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-0.047607421875,
-0.09912109375,
0.005... | 20,529 | 20529 | |
Help with taking the derivative of any of these inverse tangent functions?
March 29th 2009, 01:00 PM
dillonmhudson
Help with taking the derivative of any of these inverse tangent functions?
PS I KNOW THE FORMULAS I'M JUST NEW TO THIS AND STILL DON'T QUITE UNDERSTAND IT ALL (Headbang)
1. g(x) = 3arccos(x/2)
... | 5 | [
-0.022216796875,
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0.05029296875,
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-0.00552368... | 20,530 | 20530 | |
Displacement current
From Wikipedia, the free encyclopedia
In electromagnetism, displacement current is a quantity that is defined in terms of the rate of change of electric displacement field. Displacement current has the units of electric current density,
and it has an associated magnetic field just as actual curren... | 4 | [
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0.060058593... | 20,531 | 20531 | |
Galois groups
March 14th 2010, 04:19 PM
Krahl
Galois groups
If L:K (field extension) is finite and seperable but not normal, then
|Gal(L:K)|<[L:K]. where Gal(L:K) is the group of k-Auts on L. [L:K] is the degree of the extension.
Since L:K is finite and seperable it is simple so i can say $L=K(\alpha)$.... | 5 | [
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-0.0922... | 20,532 | 20532 | |
IMA Postdoc Seminar (October 21, 2008)
Speaker: Mark Herman (IMA)
Title: Born-Oppenheimer Corrections Near a Renner-Teller Crossing
Abstract: We perform a rigorous mathematical analysis of the bending modes of a linear triatomic molecule that exhibits the Renner-Teller effect. Assuming the potentials are smooth, we ... | 4 | [
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Infinite Dimensional Banach Spaces
Dear Colleagues, I have the following question, Why infinite dimensional Banach spaces are not locally compact. Regards, Raed.
We only have to show that the unit ball $\overline B$ of $E$ is not compact. If we assume that the unit ball is compact, then we can find an integer $N$ and ... | 4 | [
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-0.044189453125,... | 20,534 | 20534 | |
I'm new to this forum...can someone help with a function problem?
December 14th 2007, 08:08 PM #1
Newbie
Joined
Dec 2007
Posts
4
I'm new to this forum...can someone help with a function problem?
The problem is:
Find an equation for the family of line tangent to the circle with the centre at the orig... | 5 | [
-0.068359375,
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Line Prove
January 16th 2007, 01:48 PM
symmetry
Line Prove
Show that the line containing the point (a, b) and (b, a) is perpendicular to the line y = x.
Also show that the midpoint of (a, b) and (b, a) lies on the line y = x.
January 16th 2007, 02:02 PM
Soroban
Hello, symmetry!
I must assume tha... | 4 | [
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0.00604248... | 20,536 | 20536 | |
Probability Distributions
May 20th 2012, 12:30 PM #1
Newbie
Joined
Sep 2010
Posts
21
Probability Distributions
Consider a random sample Y1, . . . , Yn from a normal population with mean μ and with variance σ2. Define
Screen Shot 2012-05-20 at 4.22.25 PM.png
The question in my textbook then asks:F... | 5 | [
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polynomial in finite field
Prove for any $a, b \in \mathbb{F}_{p^n}$ that if $x^3+ax+b$ is irreducible then $-4a^3-27b^2$ is a square in $\mathbb{F}_{p^n}$.
the splitting field of $p(x)=x^3 + ax +b$ is $\mathbb{F}_q,$ where $q=p^{3n}.$ let $\alpha, \beta, \gamma$ be the roots of $p(x).$ a simple calculation shows that... | 5 | [
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Math Help
Hello,A sequence $(x_n)$ is a Cauchy sequence if : $\forall ~ \varepsilon > 0, ~ \exists N \in \mathbb{N}, ~ \text{such that } \forall ~ p,q > N, ~ |x_p-x_q|< \varepsilon$ Note that since $0<r<1$, $\
forall ~ \delta > 0, ~ \exists ~ N \in \mathbb{N}, ~ \text{such that } \forall ~ n > N, ~ r^n < \delta$ becau... | 4 | [
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help with structural induction
May 31st 2011, 01:49 PM #1
Senior Member
Joined
Sep 2009
Posts
299
Suppose E is the set of well-formed algebraic expressions, with vr(e) and op(e) denoting the number of variables and operator occurrences in an expression e∈E.
1)
Expressions in E use infix notation ... | 4 | [
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0.041748046875,
... | 20,540 | 20540 | |
Math Help
March 19th 2008, 03:04 PM #1
Newbie
Joined
Nov 2006
Posts
15
Residue
I have a doubt with the singularities and poles of a function, for example in the next complex function:
$f(x)=\sqrt{x^2+a}$
with $a$ a constant. The function is zero when $x=\pm{\sqrt{a}}$
For this value of x,... | 5 | [
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A Novel Feature Extraction Method for Nonintrusive Appliance Load Monitoring
Applied Computational Intelligence and Soft Computing
Volume 2013 (2013), Article ID 686345, 7 pages
http://dx.doi.org/10.1155/2013/686345
Research Article
A Novel Feature Extraction Method for Nonintrusive Appliance Load Monitoring
^1Depar... | 4 | [
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Project Euler — problem 14
July 16, 2012
By Tony
It’s Monday today! It’s work day! And I’ve already worked on computer for two hours. Time for a break, which is the 14th problem of Project Euler.
The following iterative sequence is defined for the set of positive integers: n n/2 (n is even); n n + 1 (n is odd)
... | 4 | [
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Patent US7535410 - Weight calculation method, weight calculation device, adaptive array antenna, and radar device
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2006-203692, filed Jul. 26, 2006, the entire contents of... | 4 | [
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... | 20,544 | 20544 | |
Patent US4384357 - Self-synchronization circuit for a FFSK or MSK demodulator
BACKGROUND OF THE INVENTION
This invention relates to a special Frequency Shift Keying (FSK) system that is known as the "Fast FSK", and in particular it provides an improved self-synchronizing receiver for demodulating "Fast
FSK" radio sign... | 4 | [
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-... | 20,545 | 20545 | |
PHYS3410
PHYS3410 BIOPHYSICS II
Lecture Notes
Section I: Thermodynamics of Biological Systems
Lecture 5 : Statistical Interpretation of... | 4 | [
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Powers of a Monomial
What happens when a monomial is raised to a power? A good way to introduce this concept is to work again with powers of 2. First look at the squares of various powers of 2.
2^ n ( 2^ n )^2
2^ 1 = 2 4 = 2 ^2
2^ 2 = 4 16 = 2 ^4
2^ 3 = 8 64 = 2 ^6
2^ 4 = 16 256 = 2 ^8
2^ 5 = 32 ... | 4 | [
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Prove A^A=AvA=A
April 5th 2009, 09:28 PM #1
1) "Prove $A\cap{A}=A\cup{A}=A$." (This is very first workbook exercise for our Real (and Complex) analysis.)
I have more: 2) "Prove that if $a>b\Rightarrow -a<-b$" and prove that 3) "square of every negative number is a positive number".
I presume that the mor... | 5 | [
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0... | 20,548 | 20548 | |
Math Help
February 18th 2010, 09:03 AM #1
Junior Member
Joined
Aug 2009
Posts
27
Similarity
Help please,
Consider,in an oriented plane,a direct rectangle AEFD.
such that (AE,AD)=pi/2+2kpi , AE=2sqrt(2) and AD=2.
Designate by B and C the midpoints of [AE] and [FD] respectively.
Let S b... | 5 | [
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Help with local max/min, concavity, increasing decreasing?
April 23rd 2010, 07:38 PM #1
Member
Joined
Dec 2009
Posts
103
Help with local max/min, concavity, increasing decreasing?
13) $f(x)=sin x + cos x 0\leq x \leq 2\pi$
$f'(x)=cosx-sinx = 0$
$x = \frac{\pi}{4} and \frac{5\pi}{4}$
how do I ... | 4 | [
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Patent US5381361 - Method and apparatus for real-time constraint solution
BACKGROUND OF THE INVENTION
1. Field of the Invention
The method and apparatus of the present invention relates to a constraint solution technique and analog VLSI implementation of the same.
2. Art Background
There has been increasing interes... | 4 | [
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Trying to prove or disprove statement about irreducibility
January 16th 2012, 01:10 PM #1
MHF Contributor
Joined
Apr 2008
Posts
1,092
Trying to prove or disprove statement about irreducibility
This is the statement I am trying to prove or disprove:
Let $p(x) = \frac{x^m - 1}{x - 1}$ where $m = p^n$ ... | 4 | [
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0.02661132... | 20,552 | 20552 | |
Hilbert A-module
August 25th 2010, 01:23 AM #1
Hilbert A-module
Suppose X is a Hilbert A-module. I would like to show that for each $x\in X$ there is a unique $y\in X$ such that $x=y\cdot\langle y,y\rangle$
The plan is to use adjoinable operators for each $x\in X$
$D_x:X\rightarrow A,D_x(y):=\langle x,y\... | 4 | [
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... | 20,553 | 20553 | |
Math Help
November 17th 2007, 05:11 AM #1
Newbie
Joined
Nov 2007
Posts
3
Have homework on indices as follows but unable to solve. Any help is appreciated.
Evaluate
1) 12^x/3^x-1
2) 12^x/3^x-1 multiply 4^x+1/2
3) 24^x//2^3x+1 multiply [3^x+1/2^2x+1]^-2
thank you so much
Hello,... | 4 | [
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Electromagnetic hamiltonian factor of 1/c question
Unfortunately, in electromagnetism there are still (at least) three systems of units in use.
The oldest are the Gaussian units, where the Lagrangian reads
[tex]\mathcal{L}=-\frac{1}{16 \pi} F_{\mu \nu} F^{\mu \nu} - \frac{1}{c} j_{\mu} A^{\mu},[/tex]
where [itex](A^{\... | 4 | [
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0.0517578125,
0.059814453125,
-0.001983642578125,
0.0299072265625,
-0.061279296875,
0.01226... | 20,555 | 20555 | |
Complex equations
June 6th 2012, 12:58 PM #1
Newbie
Joined
Dec 2011
Posts
8
Hi!
I got stuck on these 2 questions when I tried to do some math:
A)
IF its possible solve the equation:
z− 4iz= 3 + i
B)
Write the complex number z in polar form and the form eZ. Reply to this in p... | 4 | [
-0.07080078125,
0.01446533203125,
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0.021240234375,
0.0107421875,
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0.08056640625,
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0.03125,
0.068359375,
0.05078125,
0.00007534027099609375,
-0.0859375,
-0.01226806640625,
-... | 20,556 | 20556 | |
Inclusion Exclusion Principle?
May 10th 2012, 04:54 AM
combinatorixxx
Inclusion Exclusion Principle?
Question: n letters belong to n envelopes. How many ways can these be arranged such that each letter is in the wrong envelope?
I'm quite stuck. I was thinking of applying the Inclusion-Exclusion Principle, s... | 5 | [
0.01123046875,
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0.052734375,
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0.05322265625,
-0.0888671875,
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0.064453125,
0.0181884765625,
-0.09765625... | 20,557 | 20557 | |
Patente US20030044004 - Ring arithmetic method, system, and apparatus
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of the following U.S. Provisional Applications, all of which are hereby incorporated by reference, and the content of which are not necessarily identical to
the conte... | 4 | [
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-0.0296630859375... | 20,558 | 20558 | |
optimization problems and a related rates problem
June 28th 2009, 08:30 PM #1
Newbie
Joined
Jun 2009
Posts
2
1) A rectangular plot of land is to be fenced in using two kinds of fencing. Two opposite sides will use heavy-duty fencing selling for $3 a foot, while the remaining two sides will be standard
... | 4 | [
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0.1015625,
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0.15234375,
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0.0000209808349... | 20,559 | 20559 | |
Activity Based Physics Thinking Problems in Electromagnetism: Electrostatics
4) Sketch qualitatively the pattern of electric field lines created by four equal positive charges placed at the corner of a square. Sketch qualitatively the equipotential surfaces for this
configuration. (You only need to draw the fie... | 4 | [
-0.03466796875,
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Thevenin Equivalent Circuit
1. The problem statement, all variables and given/known data
Find the Thevening Equivalent Circuit for the following circuit:
2. Relevant equations
KVL, KCL.
3. The attempt at a solution
First of all, I calculate the current in the middle mesh, which I'll call i2:
[tex] - j25 = ({i_2... | 4 | [
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0.0064697265625,
-0.0308837890625,
0.... | 20,561 | 20561 | |
Aime 2006 II #6
April 9th 2006, 08:26 AM #1
MHF Contributor
Joined
Oct 2005
From
Earth
Posts
1,599
Aime 2006 II #6
"Square $ABCD$ has sides of length 1. Points $E$ and $F$ are on $\overline{BC}$ and $\overline{CD}$, respectively, so that $\triangle AEF$ is equilateral. A square with vertex $B$ has si... | 4 | [
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Prove that Q[√d] = {a + b√d | a, b ϵ Q} is a field where d is a positive integer.
April 6th 2010, 09:34 PM #1
Newbie
Joined
Oct 2008
Posts
13
Prove that Q[√d] = {a + b√d | a, b ϵ Q} is a field where d is a positive integer.
Help
I hope this helps: in order to prove a ring is field we have to pro... | 4 | [
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0.0458984375,
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0.11083984375,
-0.0... | 20,563 | 20563 | |
Prove : cosx,cos2x,cos4x,cos6x
Hello dhiabBegin with $\cos6x + 6\cos4x+15\cos2x$, and use the formulae for the cosines of multiple angles in terms of powers of $\cos x$ (for instance, here). This expression immediately reduces to
$32\cos^6x - 10$ and the result then follows. Grandad
Another approach: $\cos^6x=(\cos^2x... | 5 | [
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0.082... | 20,564 | 20564 | |
Linear Transformations (polynomials/matrices)
Never mind, I can see it now, thanks
1. The problem statement, all variables and given/known data
Let S be the linear transformation on P2 into P3 over R. S(p(x)) = xp(x)
Let T be the linear transformation on P3 over R into R2x2 defined by T(a0 + a1x + a2x^2 + a3x^3) = [ a... | 4 | [
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0... | 20,565 | 20565 | |
How to use the Thin Lens Formula to model a thick lens -- PanoHelp.com
How to properly use the "Thin Lens Formula"
to model a 35mm camera 'thick' lens
... | 5 | [
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... | 20,566 | 20566 | |
Machined Learnings
So I've become briefly obsessed with regression reductions for cost-sensitive multiclass classification (CSMC) because I'm hoping it will improve my intuition about what happens when a decision
problem is solved by
first machine learning estimates of coefficients and then using those coefficients in... | 4 | [
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... | 20,567 | 20567 | |
Patent US6763504 - Method for reducing RC parasitics in interconnect networks of an integrated circuit
FIELD OF THE INVENTION
This invention is related to the field of design automation, and more particularly, to a method for reducing the size of RC parasitics of interconnect networks in an integrated circuit (IC) in ... | 4 | [
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0.0151... | 20,568 | 20568 | |
double integration with polar coordinates
By changing to polar coordinates, evaluate the integral (where a>0): int[a,0]int[sqrt(a^2 - x^2), 0](x^2 + y^2)dydx
May aswell post here! Draw a picture of the region of the limits. The lower limits are x = 0 and y = 0, which tells you that both x > 0 and y > 0, which means yo... | 5 | [
0.038330078125,
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-0.028076171875,
-0.038818359375... | 20,569 | 20569 | |
Statistics Tutorial
Tutorial Navigation
Getting Started General Instructions | Introduction to Your Study | Experimental Design | Stating a Hypothesis
Descriptive Statistics Histograms | Central Tendency | Standard Deviation | Confidence Intervals
Comparing ... | 4 | [
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Linear Sigma Model Invariance Under O(N)
In addition to my Faddeev-Popov Trick thread, I'm still tying up a few other loose ends before going into Part III of Peskin and Schroeder.
I was able to show that the other Lagrangians introduced thus far are indeed invariant under the transformations given. But, I am hung up ... | 4 | [
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0.046875,
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0.06030273... | 20,571 | 20571 | |
Equations involving variables and Logarithms
July 5th 2011, 10:57 AM #1
Member
Joined
Oct 2009
From
Detroit
Posts
157
Thanks
5
Equations involving variables and Logarithms
I have;
log 2x = log 3+ log (x-1)
and
ln x + ln (x-2) - ln (x+4) = 0
I can not figure out how to separate... | 4 | [
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... | 20,572 | 20572 | |
fixed point
Thomas L. Bevan thomas_bevan at toll.com.au
Mon Oct 27 16:50:16 EST 2003
Is there a simple transformation that can be applied to all
recursive functions to render them non-recursive with fix.
( i suppose there must be or we wouldn't have haskell right? )
ie
f :: a -> a
f x = .... f ....
g :: (a -> a) ->... | 5 | [
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0.0311279296875,
-0.04589843... | 20,573 | 20573 | |
Calculus Worded Problem Help
August 9th 2009, 12:27 AM #1
Junior Member
Joined
Apr 2009
Posts
38
Calculus Worded Problem Help
A rectangular block is such that the sides of its base are of length x cm and 3x cm. The
sum of the lengths of all its edges is 20 cm.
a) Show that the volume, V cm^3, is... | 4 | [
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0.11767... | 20,574 | 20574 | |
Directional Derivative in direction of max change
February 10th 2009, 08:14 AM #1
Member
Joined
Oct 2007
Posts
159
Directional Derivative in direction of max change
I need help! I am suppose to find the directional derivative of function xy + z^2 at point (2,3,4)
I know that this means in the direct... | 5 | [
0.018798828125,
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0.... | 20,575 | 20575 | |
Summation notation
May 27th 2009, 06:58 PM
Y-rag
Summation notation
If I had 12 measurements: 30, -38, -70, -78, 32, 73, 49, -88, 29, 32, 42, 6, and they were labeled x1, x2, x3 etc, how would I find the following?
Find http://www.aleks.com/alekscgi/x/math...3%28%237%3A%2A .
I added all the numbers, an... | 4 | [
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Can a vectorspace ever contain a 4 vector basis?
November 17th 2011, 07:29 AM
MathIsOhSoHard
Can a vectorspace ever contain a 4 vector basis?
A vectorspace with 1 basis vectors is a straight line.
A vectorspace with 2 basis vectors is a plane.
A vectorspace with 3 basis vectors is a space.
So does s... | 5 | [
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0.0756... | 20,577 | 20577 | |
Maximal and Prime Ideals
October 7th 2009, 06:53 PM #1
Junior Member
Joined
May 2008
Posts
70
Maximal and Prime Ideals
Letting R be a finite commutative ring with unity, show that all prime ideals of R are also maximal ideals of R.
I know that if an ideal, I, of R is maximal then R/I is a field and ... | 5 | [
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0.035... | 20,578 | 20578 | |
Improved Qrginv Algorithm for Computing Moore-Penrose Inverse Matrices
ISRN Applied Mathematics
Volume 2014 (2014), Article ID 641706, 5 pages
http://dx.doi.org/10.1155/2014/641706
Research Article
Improved Qrginv Algorithm for Computing Moore-Penrose Inverse Matrices
Mathematics Department, Persian Gulf University,... | 4 | [
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Trigonometric Sum
May 22nd 2009, 01:38 PM #1
MHF Contributor
Joined
Jul 2008
From
NYC
Posts
1,489
Trigonometric Sum
I would like you to show me how to get the amplitude and phase shift of the sum of the trigonometric sum below.
8sin(50pi*x+pi/4)+7sin(50pi*x-pi/3)
Trigonometry
Hello magent... | 5 | [
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0.0... | 20,580 | 20580 | |
Difficulty with Optimisation (Maxima and Minima) and Integration Problems
June 10th 2012, 01:18 AM #1
Newbie
Joined
Aug 2010
Posts
11
Difficulty with Optimisation (Maxima and Minima) and Integration Problems
Hi there,
There are a few optimisation and integration problems I can't seem to solve. Pleas... | 5 | [
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0.1181640625,
-0.05029296875,
-0.01843261... | 20,581 | 20581 | |
How to solve for unknowns ?
Here is the question , i tried to solve it using lns but didnt work out for me
$Z = aV^bP^c$, take the $\ln$ from both side,.. $\ln Z = \ln a + b \ln V + c \ln P$ for $P$ constant, we have $\ln Z_{2} = \ln a + b \ln V_{2} + c \ln P$$. . .eqn (1)$ $\ln Z_{3} = \ln a + b \ln V_
{3} + c \ln P$... | 4 | [
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-0.1513671875,
... | 20,582 | 20582 | |
Math Help
June 7th 2008, 01:54 PM #1
Junior Member
Joined
Jun 2008
Posts
39
derivitives
I have to find y'' for rad(t^3+1)
I got y' = 3t^2/(2rad(t^3+1)
i need help with y'' I cannot get to the answer
$y = \sqrt{t^{3} + 1}$
You calculated y' correctly. To calculate y'', you can use the... | 5 | [
-0.052978515625,
-0.047119140625,
0.01904296875,
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-0.0252685546875,... | 20,583 | 20583 | |
Graph theory - perfect matching using Petersen's theorem
September 22nd 2010, 03:37 AM #1
Newbie
Joined
Sep 2009
Posts
3
Graph theory - perfect matching using Petersen's theorem
HI guys ,
I have a little problem regarding Perfect Matching .
I have a graph G=(V,E) with |V|=2n and δ(G)>=n (where ... | 5 | [
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Math Help
April 30th 2007, 02:09 AM #1
Junior Member
Joined
Oct 2006
Posts
36
Calculus
Hi. I was wondering if anyone could help me on these two problems. I'm having some difficulty with the problems, so if someone could please explain it, I'd be very grateful. Thanks.
(multiple choice)
1. Let f... | 5 | [
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0.015380859375,
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0.05810546875,
-0.07373046875,
-0.0380859375,
... | 20,585 | 20585 | |
Quadrtaic Function word porblem
Determine The Value of k so that y=5xsquared+100x+k has a maximum of 205 I am really lost on this one
Put the equation into standard form then solve for k
nickdutta: "Determine The Value of k so that y=5xsquared+100x+k has a maximum of 205." The parabolic equation y = 5x^2 + 100x + k i... | 4 | [
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0.08837890625,
0.01116943359375,
-0.033... | 20,586 | 20586 | |
some ideas in inequalities that i don't get.
February 3rd 2013, 04:51 AM
SHEvA9
some ideas in inequalities that i don't get.
Hello
http://im35.gulfup.com/GDxl1.png
since my mother language is not English, I find it difficult to understand some explanations. and i hope here i could find some help.
... | 4 | [
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-0.... | 20,587 | 20587 | |
geometry proof
February 15th 2010, 05:04 AM #1
Junior Member
Joined
Sep 2008
Posts
47
geometry proof
Discover the fallacy in the following “proof”:
If two opposite sides of a quadrilateral
are congruent, then the remaining two sides must be parallel.
Proof
: In quadrilateral 2ABCD,... | 4 | [
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linear algebra change of basis
August 7th 2010, 03:47 PM #1
Junior Member
Joined
Jul 2010
Posts
66
linear algebra change of basis
Let p(x) = 7 -12x - 8x^2 + 12x^3. Find the coordinate vector of p relative to B.
Hint: Determine {c0, c1, c2, c3} such that p(x) = the sum from i = 0 to 3 of c_i * H_i(x)
... | 5 | [
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Patent US4609993 - Graphic display system having analog interpolators
BACKGROUND OF THE INVENTION
The present invention relates to a graphic display system which operates at high speed to provide real time display.
Conventional graphic display systems comprise a central processing unit, a frame memory in which displa... | 4 | [
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0... | 20,590 | 20590 | |
Unstructured Grids and the Multigroup Neutron Diffusion Equation
Science and Technology of Nuclear Installations
Volume 2013 (2013), Article ID 641863, 26 pages
http://dx.doi.org/10.1155/2013/641863
Research Article
Unstructured Grids and the Multigroup Neutron Diffusion Equation
TECNA Estudios y Proyectos de Ingeni... | 4 | [
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Patent US6549581 - Transmitter and method to cancel interference in OFDM communication
FIELD OF THE INVENTION
The present invention relates to a transmitter and a method as well as to a transmitting system for the wireless transmission of informational data and particularly to a technique for interference
cancellation... | 4 | [
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0.01092529296875... | 20,592 | 20592 | |
Data and Theory Point to Mainly Additive Genetic Variance for Complex Traits
Abstract
The relative proportion of additive and non-additive variation for complex traits is important in evolutionary biology, medicine, and agriculture. We address a long-standing controversy and paradox
about the contribution of non-addit... | 4 | [
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Noise power in conductor
Rudibot
Thanks Bob,
Sowhy do we need the relationship
P = 4.k.T.R.B
If we already know the power in the circuit?
4 k T R B is the variance of the voltage (which you could call "the power" but of the voltage signal, "power" not being physical power, but "square of the signal").
BTW, if y... | 4 | [
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alternate series question
April 17th 2007, 11:02 PM #1
Senior Member
Joined
Jan 2007
Posts
477
alternate series question
Converges or diverges?
SUM n_infinity (-1)^n(2^n*n!)/(5*8*11*...*(3n +2)
i believe this is an alternating series.
the 5*8*11*.. confuses me.
thankyou for any help.
... | 4 | [
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A look at a few Tripos questions VII
The obligatory question on countability/uncountability.
5C. Define what is meant by the term countable. Show directly from your definition that if $X$ is countable, then so is any subset of $X$.
Show that $\mathbb{N}\times\mathbb{N}$ is countable. Hence or otherwise, show that a ... | 5 | [
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Short questions
find the third term of the expansion (2x-y)to the third power.
I know u have to do the things with the combinations but all i get is 20xy?but the answer is 6xy? Can anyone help?
I think you mean to find the 3rd term in descending powers of x
Method 1:
(2x-y)
^3
= (Summation r from 0 to 3) C
^3[r]
... | 4 | [
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0.02355957031... | 20,597 | 20597 | |
A power question....
November 1st 2009, 03:53 PM #1
Newbie
Joined
Oct 2009
Posts
23
12 means I x 1, 22 means 2 x 2, 32means 3 x 3, and so forth. 12+ 22+ 32+ 42 + ... + 252= 5525, and 22+ 42+ 62 + 82 + ... + 502 = N. Find the value of N.
Now we have been told the answer is 22,100; but I don't know how... | 4 | [
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Patent US4885686 - Methods and apparatus for efficient resource allocation
TECHNICAL FIELD
This invention relates to systems for using the Karmarkar algorithm for resource allocation among a plurality of resource utilizers, and, more particularly, to the use of partitioning techniques for
allocations including values ... | 4 | [
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