content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
I have a question regarding the normal distribution!!
November 4th 2012, 04:50 PM
theconman12345
I have a question regarding the normal distribution!!
Hi,
I have a question reagrding the normal distribution.
Suppose there are 3 normal distribution equations as follows
X1~N(5,9)
X2~N(10,16)
X... | 4 | [
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0.017578125,
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0.08203125,
0.0439453125,
0.0263671875,
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0.03466796875,
-0.00518798828125,
-0.05029296875,
-0.01867675781... | 16,200 | 16200 | |
Physics Forums - Proving Rotational K.E. Formula?
Proving Rotational K.E. Formula?
The total kinetic energy (as viewed from one inertial frame) of a free, rigid body is the sum of all the infinitesimal kinetic energies of the components that comprise the body.
How do we prove that for a rotating body
[tex]E_k=\f... | 4 | [
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0.1328125,
... | 16,201 | 16201 | |
Area Increasing
January 23rd 2014, 01:05 PM #1
Newbie
Joined
Jan 2014
From
Texas
Posts
3
Area Increasing
The length of a rectangle is increasing at a rate of 2 ft. per second, while the width is increasing at a rate of 3 ft. per second. When the length is 4 ft. and the width is 6 ft., how fast, in
... | 4 | [
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0.0673828125,... | 16,202 | 16202 | |
Explain how 4/15 is equivalent to recurring decimal.
As stated in the title - Quote: Explain how 4/15 is equivalent to recurring decimal. Many Thaanks!
Hi BabyMilo, Let's do the long division on this thing. Code: 0 . 2 6 6 6 6 ------------------------ 15 | 4 . 0 0 0 0 0 0 ---------- 4 0 3 0 --------- 1 0 0 9 0 -------... | 4 | [
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0.06... | 16,203 | 16203 | |
derivitive of e to the x root
Are you asking "How do you find the derivative of $\displaystyle y = \sin{\left(e^{3x}\right)}$"? If so, use the Chain Rule.
Let $\displaystyle u = e^{3x}$ so that $\displaystyle y = \sin{u}$. You should know that $\displaystyle \frac{dy}{dx} = \frac{du}{dx}\,\frac{dy}{du}$.
Last edited ... | 5 | [
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... | 16,204 | 16204 | |
Math Help
September 17th 2012, 05:09 AM #1
Senior Member
Joined
Sep 2012
From
Sweden
Posts
250
Thanks
6
need help!
ok i dont know how to solve this problem but i got this far and idk what to do next ok here is the question:
For which integers are 4x-6 divisible by 14?
how far i got
... | 4 | [
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-0.01434... | 16,205 | 16205 | |
Inverse of a Matrix: Solve for m, n, p
m+2n+p=5
3m+4n+p=8
m-6n+2p=4
There are 2 ways taught us to solve for this using matrix.
The Inverse method and Row-Echelon method.
In row echelon method i got this answer:
m=1
n=1/2
p=3
i know the answer is correct because when i substitu... | 4 | [
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-0.0... | 16,206 | 16206 | |
Second quantization
blechman
Not sure what you mean. The state [itex]|\phi(x)\rangle=\hat{\Phi}(x)|0\rangle[/itex], and the wavefunction is [itex]\phi(x)\equiv\langle 0|\phi(x)\rangle[/itex] in my above notation. Does that make
sense?
This makes no sense to me. Doesn't the operator [itex]\hat{\Phi}(x)[/itex] annihi... | 4 | [
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How to find Mt and N
$t^2+4t+3=A(1+t^2)+(Mt+N)2t$ I got that $A=3$ But how do I get $Mt$and $N$
One way is to expand, Expand, $t^2+4t+3=(A+2M)t^2+(2N)t+(A)$ Corresponding parts are equal, $\left\{ \begin{array}{cccc}A&+2M& \,&=1 \\ \,&\,&N&=4\\ A&\,&\,& = 3 \end{array} \right\}$ You can solve
the first equation since ... | 4 | [
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0.0400390625,
... | 16,208 | 16208 | |
How do I evaluate the integral of (sin(2t)^2)^(1/2) ?
April 26th 2012, 11:39 AM #1
Junior Member
Joined
Dec 2009
Posts
68
Thanks
1
How do I evaluate the integral of (sin(2t)^2)^(1/2) ?
I had to evaluate an integral from 0 to 2pi in which the integrand was sqrt(sin(2x)^2). I figured the square root o... | 5 | [
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Problem to prove "always divisible by"
August 26th 2008, 05:58 PM #1
Newbie
Joined
Dec 2007
Posts
3
Problem to prove "always divisible by"
Hi guys! I did not know how to write this out with the math language here so here's a screen shot from word :> Thanks!
Hello !
Here is your question in LaTe... | 5 | [
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Integrals please help.
April 24th 2006, 03:44 AM #1
Junior Member
Joined
Apr 2006
Posts
37
Integrals please help.
I have maked some mistakes in follow integrals but I can't find them.
Who can help?
$\int \int \int z \ dxdydz \ = \ \int^2_{0} \int^2_0 \int ^{\sqrt{4-y^{2}}} z \ dz dydx$
$=\i... | 5 | [
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Patente US4896338 - Method and device for the digital synthesis of a clock signal
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and a device for the digital synthesis of a clock signal.
It applies to the making of clock signal generators for radio communications and,... | 4 | [
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0.081054... | 16,212 | 16212 | |
A New Characteristic Nonconforming Mixed Finite Element Scheme for Convection-Dominated Diffusion Problem
Journal of Applied Mathematics
Volume 2013 (2013), Article ID 951692, 10 pages
http://dx.doi.org/10.1155/2013/951692
Research Article
A New Characteristic Nonconforming Mixed Finite Element Scheme for Convection-... | 5 | [
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Quick arc length question
July 30th 2008, 05:00 AM #1
Newbie
Joined
Jul 2008
Posts
11
Quick arc length question
Hi all, i wonder if anyone can help me with this question, tried and failed&im wasting too much time on this one!
Determine the arc lenth of:
$<br /> \begin{gathered}<br /> y = \ln \co... | 5 | [
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Differential calculus problem
January 3rd 2009, 10:51 PM #1
Newbie
Joined
Jan 2009
Posts
5
Differential calculus problem
I am studying calculus at home as a hobby. I have 2 books: The Complete Idiot's Guide to Calculus by W. M. Kelley (K), and Calculus Made Easy (1998)by S.P.Thomson and M.Gardner (T).
... | 4 | [
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Simple Differentiation help
June 20th 2010, 05:02 PM
seanP
Simple Differentiation help
i need to differentiate these 3 functions.
for a, am i supposed to use the quotient rule ? or would it just be 3x^2/1?
x by itself is equal to 1 right?
and constants are mostly ignored except for special situations... | 5 | [
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Brevet US4350974 - Logarithmic analog-to-digital converter
This is a continuation of application Ser. No. 836,158, filed Sept. 23, 1977.
FIELD OF THE INVENTION
This invention relates to analog-to-digital converters, and more particularly to analog-to-digital converters in which the logarithm of an input signal is com... | 4 | [
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0.0... | 16,217 | 16217 | |
Deriving general cube roots
This is what I tried:
[tex]f(x)=ax^3+bx^2+cx+d=0[/tex] is the general equation to solve, and intersects the y axis a distance d from the origin.
So, consider [tex]f(x-x_0)=g(x)[/tex] where [tex]x_0[/tex] is one solution of [tex]f(x)=0[/tex]. As we have shifted the original function along ... | 4 | [
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0.... | 16,218 | 16218 | |
Patent US5384810 - Modulo decoder
BACKGROUND OF THE INVENTION
The present invention relates to decoding techniques used in data communications.
In a data communications system in which convolutional coding is used, a data receiver typically applies a "maximum likelihood decoding" procedure to a sequence of received s... | 4 | [
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... | 16,219 | 16219 | |
Question - Relationship Between the Roots of a Cubic Equation and its Coefficients.
May 14th 2013, 10:32 AM #1
Newbie
Joined
Sep 2011
From
UK
Posts
17
Thanks
7
Question - Relationship Between the Roots of a Cubic Equation and its Coefficients.
My problem comes from the Further Pure Maths 2 textbo... | 4 | [
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Drude formula
I can't derive it properly even though it should be easy:
From Newtons 2nd law:
m dv/dt = -eE
=>
v(t) = -meEt + v(0) (the latter will average out when taking average)
Now the Drude assumption: An electron will on average travel a time τ before being scattered and starting its motion in the direction o... | 4 | [
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-0... | 16,221 | 16221 | |
Polar coordinates
January 28th 2008, 09:36 PM #1
Member
Joined
Sep 2007
Posts
198
Polar coordinates
Sketch the curve given in polar coordinates by the equation
r = 2 + cos Ѳ
(a) Find the area of the region enclosed by the curve.
(b) Giving answers to 2 decimal places, find the coordinates o... | 4 | [
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How to solve optimization problem of the form MIN Tr[C'ACB] subject to C'C= a.I
November 13th 2012, 04:03 AM #1
Newbie
Joined
Nov 2012
From
Belgium
Posts
1
How to solve optimization problem of the form MIN Tr[C'ACB] subject to C'C= a.I
Hi
I have an optimization problem as follows:
Determine... | 4 | [
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0.053... | 16,223 | 16223 | |
[SOLVED] trapezoid problem area
June 4th 2008, 05:32 PM
roxmysox
[SOLVED] trapezoid problem area
this is a tough problem and i just can't seem to solve it. please help, thank you
there is a trapezoid EFZD. top left is E, top right is F, bottom right is Z, and bottom left is D. it is an isosceles trapezoid. ... | 4 | [
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Predator vs. prey - trouble
I am having a bit of trouble deciding how to tackle a project in my LDE class. Any advice on how to get started or what to look out for would be greatly appreciated. It's quite lengthy so I'll try to
shorten it wherever possible.
-----
Address the impact of a generalist predator on a popula... | 4 | [
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find limit by rearrangement or L'Hopital's?
April 11th 2008, 08:50 PM
framer
find limit by rearrangement or L'Hopital's?
Hi, 1st post.
According to my text book the following limit converges to $e^2$:
$\lim_{n\to\infty}(\frac {n + 3}{n + 1})^n<br />$
through rearrangement i can achieve this:
... | 5 | [
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Physics Forums - View Single Post - Tersonian decimal expansion?
1. The problem statement, all variables and given/known data
1/7=?
2. Relevant equations
3. The attempt at a solution
Consider $$y=\overline{145827}.0=\dots145827145827145827.0$$,
then $$1000000y=\dots 145827145827000000.0$$ and $$-999999y=145827$... | 4 | [
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linear differential operators
February 21st 2013, 11:39 AM #1
Newbie
Joined
Feb 2013
From
Prague
Posts
3
Exponential input theorem
Hello, I am puzzled about this operation (1) with polynomials in a general proof of Exponential input theorem and I don't understand the the concept of a being s-fold zer... | 4 | [
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Why complimentary Function ?
September 22nd 2012, 09:26 AM
pratique21
Why complimentary Function ?
Why do we find Complementary Function for 2nd order differential equations. Why do we consider the homogeneous equation to find it and why is it a part of the solution ?
Individually it does not even satisfy th... | 5 | [
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Volume of Cone in R3
May 2nd 2011, 01:15 PM
Ant
Volume of Cone in R3
I'm trying to compute the area of the Cone (Z = sqrt[ x^2 + y^2] below the plane z = 2.
Using cylindricl polars coordinates:
phi: [ -pi/2, pi/2]
r: [ 0, 2]
z: [ r, 2]
with the Jacobian being r.
I get 4/3 pi which I ... | 5 | [
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Number Theory , an easy proof .
August 1st 2010, 06:53 AM #1
Super Member
Joined
Jan 2009
Posts
715
Number Theory , an easy proof .
Let's first recall some Pythagorean Triples :
$(3,4,5) ~,~ (5,12,13) ~,~ (8,15,17) ~,~ (9,40,41) ~,~ (11,60,61)$ etc .
Can you see a pattern ? In every triple , ... | 5 | [
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Construction of Hamiltonian from Casimir operators
[QUOTE=metroplex021;3369556]
Symmetries' (section 3.5) they explain that where a system possesses a symmetry, the corresponding Hamiltonian must be 'built up' from the Casimir operators of the corresponding symmetry group.
Does anyone know of a reference where this i... | 4 | [
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Patent US20020019803 - Methods for determining value at risk
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to U.S. Provisional Application No. 60/200,742, filed May 1, 2000; U.S. Provisional Application No. 60/200,743, filed May 1, 2000; U.S. Provisional Application
No. 60/200,744, fi... | 4 | [
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Investment interest problem
October 23rd 2007, 11:03 AM
earachefl
Investment interest problem
"An investment of $1000 earns $177.23 in interest in two years. If the interest is compounded annually, find the annual interest rate. Round to the nearest tenth of a percent.)
Using the formula $P = A(1 + i)^2$, I... | 4 | [
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Sigma Algebra is closed under countable increasing unions
September 19th 2009, 04:03 PM #1
Super Member
Joined
Mar 2006
Posts
705
Thanks
2
Sigma Algebra is closed under countable increasing unions
Prove that an algebra $\mathbb {A}$ is a $\sigma$-algebra iff $\mathbb {A}$ is closed under countable in... | 4 | [
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Complex variable line integral...
September 4th 2009, 12:07 AM #1
Complex variable line integral...
My problem is computing the function of real variable $y$...
$\delta (y) = \frac{1}{2\pi i} \int_{c-i \infty}^{c+i \infty} \frac{y^{s}}{s} \cdot ds$ (1)
... where $c >0$ is real, i.e. the integral of the ... | 5 | [
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... | 16,236 | 16236 | |
groups homomorphisms
February 2nd 2008, 12:50 PM #1
Junior Member
Joined
Aug 2007
Posts
45
groups homomorphisms
hi a little help would be kindly appreciated here guys.
any suggestions on how to go about doing these?
INFORMATION
-----------------------
if K,Q are groups $\varphi : Q \rig... | 5 | [
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Is proof correct?
January 13th 2006, 03:15 AM
DenMac21
Is proof correct?
I have to prove that $a^5-a$ is dividable with 30 for every integer value of $a$.
My proof is:
$a^5-a=a(a^2-1)(a^2+1)$ and $30 = 2(2^2-1)(2^2+1)$.
So if we put $a$ instead of 2 (or 2 instead of a) the proof is proven.
I ha... | 5 | [
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Check this proof.
February 4th 2006, 02:56 PM #1
Global Moderator
Joined
Nov 2005
From
New York City
Posts
10,616
Thanks
9
Check this proof.
The author from my book wrote a nasty proof of existence of algebraic
closure for any field. It is nasty because for some reason in the first
paragr... | 5 | [
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Math Help
May 6th 2008, 09:45 AM #1
I'm a newbie so didn't really know where to post this, but I hope someone here can help me!I'm just beginning to study sequences, and I'm getting nowhere with it. Can anyone please help me with
these two problems:
1.)Show that the sequence (1/n^k)nEN is convergent if a... | 5 | [
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0.01251220... | 16,240 | 16240 | |
Air Rocket Launch Equations
Flying model rockets is a relatively safe and inexpensive way for students to learn the basics of forces and the response of a vehicle to external forces. A model rocket is subjected to four forces
in flight; weight, thrust, and the aerodynamic forces, lift and drag. There are many different... | 4 | [
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Multiple Linear Regression Model Based on Neural Network and Its Application in the MBR Simulation
Abstract and Applied Analysis
Volume 2012 (2012), Article ID 703153, 18 pages
http://dx.doi.org/10.1155/2012/703153
Research Article
Multiple Linear Regression Model Based on Neural Network and Its Application in the MB... | 4 | [
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Probibility Distribution
April 26th 2006, 09:54 PM
Arbitur
Probibility Distribution
Prob Dist.. new question....
need help with b.
got 7.5 for mean and 2.37 for standard deviation.. where i go from here?
April 29th 2006, 11:23 AM
Ranger SVO
A card is drawn from a standard deck and replaced, if thi... | 4 | [
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Method and apparatus for absolute value summation and subtraction - Patent # 5084835 - PatentGenius
Method and apparatus for absolute value summation and subtraction
5084835 Method and apparatus for absolute value summation and subtraction
Patent ... | 4 | [
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0.022094... | 16,244 | 16244 | |
Differential Equations
September 29th 2006, 11:18 PM #1
Newbie
Joined
Sep 2006
Posts
18
Differential Equations
There's this problem that's asking me to use Euler's equidimensional equation, which is a second order differential equation. The problem tells me to substitute x = exp(z) to transform the
e... | 5 | [
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0.0888671... | 16,245 | 16245 | |
Reflexive, symmetric, and transitive
December 5th 2009, 10:11 AM
oldguynewstudent
Reflexive, symmetric, and transitive
I'm not sure I have these concepts down well enough. The following is a problem from my professor:
Let S = {1,2,3,4,5}. On P(S) define the relation $\rho$ as follows: A $\rho$B iff A $\cap$... | 4 | [
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Physics Forums - Small Sample Size
needhelp83 Dec5-10 07:25 PM
Small Sample Size
[tex]\begin{tabular}{lcr}
418 & 421 & 422 & 425& 427 & 431 \tabularnewline
434 & 437 & 439 & 446 & 447 & 448 & 453 \tabularnewline
454 & 463 & 465
\end{tabular}[/tex]
1. Calc the sample mean and sample standard deviation. [tex]\sum... | 5 | [
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Patent US4896281 - Method for heat loss survey
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation of application Ser. No. 739,598, filed May 31, 1985 now abandoned.
BACKGROUND OF THE DISCLOSURE
In many different kinds of structures, heat loss or gain can be a serious problem from the standpoint of utility... | 4 | [
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0.08593... | 16,248 | 16248 | |
Integral of Rational Function
September 29th 2010, 08:17 AM #1
Junior Member
Joined
Oct 2009
Posts
57
Integral of Rational Function
I got this question on an exam this morning and I didn't know how to answer it. I've been working on it the past hour trying to figure it out. Usually with rational function... | 5 | [
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On Homoclinic Solutions for First-Order Superquadratic Hamiltonian Systems with Spectrum Point Zero
Abstract and Applied Analysis
Volume 2014 (2014), Article ID 313690, 9 pages
http://dx.doi.org/10.1155/2014/313690
Research Article
On Homoclinic Solutions for First-Order Superquadratic Hamiltonian Systems with Spectr... | 4 | [
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... | 16,250 | 16250 | |
Patent US3876871 - Self-adapting control element
O United States Patent [1 1 [1 11 3,876,871 Sinner Apr. 8, 1975 [54] SELF-ADAPTING CONTROL ELEMENT 3.463.908 8/1969 Connelly 235/l50.l
- v Inventor: Edouard n Grenoble, a c 3.795.799 3/l974 Courtrol ..35/l50.l
[73] Assignee: gtlicifte Genet-all: degonstructions Primary... | 4 | [
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... | 16,251 | 16251 | |
Positive Solutions of a Second-Order Nonlinear Neutral Delay Difference Equation
Abstract and Applied Analysis
Volume 2012 (2012), Article ID 172939, 30 pages
http://dx.doi.org/10.1155/2012/172939
Research Article
Positive Solutions of a Second-Order Nonlinear Neutral Delay Difference Equation
^1Department of Mathem... | 5 | [
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0.... | 16,252 | 16252 | |
Inductive reasoning
June 8th 2009, 01:41 AM
Såxon
Inductive reasoning
Sort of lost on how to continue...
Prove that the following formula is true for all n using inductive reasoning 3 + 7 + 11 + .... +(4n - 1) = n(2n + 1)
n = 1 is true
assume k1 is true? (4k - 1) = k(2k + 1)
now to prove k + 1
... | 4 | [
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Important question plzzzzzzz help
June 13th 2013, 12:11 PM
sscgeek
Important question plzzzzzzz help
THE SOLUTION OF
[X + (X^2-1)^1/2 / X - (X^2-1)^1/2] + [ X - (X^2-1)^1/2 / X + (X^2-1)^1/2 ] = 14
a) +8
b) -6
c) + or- 2
d) + or - 4
June 13th 2013, 12:16 PM
MarkFL
Re: Important questi... | 4 | [
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-0.07421875,
-0... | 16,254 | 16254 | |
Math Help
April 16th 2008, 04:17 PM #1
Ingtegral
ok so where did I go wrong.. $\int{cos(mx^2)^2dx}$...
so I first did this $\int{cos(mx^2)^2dx}=\int{\frac{1+cos(2mx^2)}{2}dx}$...so then I seperated it to get
$\int{\bigg[\frac{1}{2}+\frac{cos(2mx^2)}{2}dx\bigg]}$$\Rightarrow{\int{\frac{1}{2}dx}+\int{\... | 5 | [
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... | 16,255 | 16255 | |
Patent US6072997 - Frequency discriminator for a direct conversion receiver
FIELD OF THE INVENTION
The present invention relates to an improvement in a circuit construction of a frequency discriminator for an FM (frequency modulation) signal receiver by direct conversion.
DESCRIPTION OF THE PRIOR ART
There are known... | 4 | [
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... | 16,256 | 16256 | |
Patent US5181184 - Apparatus for multiplying real-time 2's complement code in a digital signal processing system and a method for the same
BACKGROUND OF THE INVENTION
The present invention generally relates to a real-time multiplier (high speed multiplier) for use in a digital signal processing system and, more partic... | 4 | [
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... | 16,257 | 16257 | |
Diagonalizable matrix
August 5th 2008, 06:58 PM #1
Junior Member
Joined
Aug 2008
Posts
44
Diagonalizable matrix
A scalar matrix is a square matrix of the form $\lambda\$I for some scalar $\lambda\$ that is, a scalar matrix is a diagonal matrix in which all the entries are equal.
a) Prove that if a s... | 5 | [
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I'm stuck, what should I do next?
Ah, well if you're using u-substitution it's especially important to specify the unit of integration at the end of your expression. The above confusion is evidence of what can go wrong when this
isn't specified. And off the top of my head, I think changing it to sec^2 would be a good i... | 5 | [
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0.1059570... | 16,259 | 16259 | |
Wave function problem
1. The problem statement, all variables and given/known data
The function
[itex] \Psi(r) = A(2-{Zr\over a})e^-{Zr\over 2a} [/itex]
gives the form of the quantum mechanical wavefunction representing the electron
in a hydrogen-like atom of atomic number Z when the electron is in its first
allowed ... | 5 | [
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-0.... | 16,260 | 16260 | |
inverse trig
I think I can use calculus to solve your problem, since you wrote some threads in calculus sub-forum, which means that you know the derivatives. For your problem: In other words, you want to prove
that: $sin^{-1}(x) = \frac{\pi}{2} - cos^{-1}(x)$ Let $f(x)=sin^{-1}(x)$, and $g(x)=\frac{\pi}{2} - cos^{-1}(x... | 5 | [
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Distance between points
find the points of (r) that distam 3 units from point A (0,2,1) (r): y=-x+2 z=2x-2 Answer: (2,0,2) and (0,2,-2)
$d = \sqrt{(x_{1} - x_{2})^2 +(y_{1} - y_{2})^2 + (z_{1} - z_{2})^2}$ $3 = \sqrt{(x - 0)^2 + ({\color{red}y} - 2)^2 + ({\color{blue}z} - 1)^2}$ $3 = \sqrt{x^2 + ({\color{red}-x + 2} -... | 4 | [
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-0.... | 16,262 | 16262 | |
A Theoretical Investigation of the Relationship between Structural Equation Modeling and Partial Correlation in Functional MRI Effective Connectivity
Computational Intelligence and Neuroscience
Volume 2009 (2009), Article ID 369341, 9 pages
http://dx.doi.org/10.1155/2009/369341
Research Article
A Theoretical Investig... | 4 | [
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Math Help
To prove this you need to know the principal value of a complex exponential. $z^w=\exp(w\cdot\text{Log}(z))$ Recall that $\text{Log}(i)=\ln(1)+\frac{i\pi}{2}.$
Yes, i have no background about how to prove it so i want to know the proof in details ,if that ok.
I think i found the proof ,but i still have one... | 5 | [
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Prove that G acts transitively on normal subgroup orbits on nonempty finite set A
November 17th 2011, 08:59 AM #1
Prove that G acts transitively on normal subgroup orbits on nonempty finite set A
The Question is let $G$ acts transitively on a nonempty finite set A
let H be normal subgroup of G,Let Orbits of ... | 5 | [
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... | 16,265 | 16265 | |
Equilibrium Conditions at a Solid-Solid Interface
Journal of Thermodynamics
Volume 2011 (2011), Article ID 940385, 9 pages
http://dx.doi.org/10.1155/2011/940385
Research Article
Equilibrium Conditions at a Solid-Solid Interface
Los Alamos National Laboratory, Theoretical Division, MS-B221, Los Alamos, NM 87545, USA
... | 4 | [
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o
Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text... | 4 | [
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Positive Mild Solutions of Periodic Boundary Value Problems for Fractional Evolution Equations
Journal of Applied Mathematics
Volume 2012 (2012), Article ID 691651, 13 pages
http://dx.doi.org/10.1155/2012/691651
Research Article
Positive Mild Solutions of Periodic Boundary Value Problems for Fractional Evolution Equa... | 5 | [
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... | 16,268 | 16268 | |
polar coordinated two variable calculus
February 22nd 2009, 05:30 AM
James0502
polar coordinated two variable calculus
Using polar coordinates evaluate
int int over D 3(x+y) and D is x^2 + y^2 <=9, x>=0
Ok, I have
int (between -pi/2 and pi/2) d theta . int(between 3 and 0) 3r^2(costheta + sintheta... | 5 | [
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Is this function harmonic?
October 7th 2009, 03:51 PM #1
Senior Member
Joined
Jun 2009
Posts
251
Is this function harmonic?[SOLVED]
$u=\frac{1}{r}$ and $r=\sqrt{x^2+y^2}$ Calculate the Laplacian L(u) and give your anser in terms of r. Use dr/dx=d/x etc.
$\frac{du}{dx}=\frac{du}{dr}=\frac{-1}{r^2}\fr... | 5 | [
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Independent Random Variables
November 29th 2010, 06:15 PM #1
Newbie
Joined
Nov 2010
Posts
9
Independent Random Variables
Hi,
I can't seem to get the same answer as the back for this question. Can someone show me how to properly do it?
Let X and Y be two independent random variables where E(X) =... | 5 | [
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Annihilator operator
Woopydalan
Hello,
I am having trouble when solving non-homogeneous DE's how to find the annihilator to find my particular solution.
For example, if you have a DE that equals 24x^2cos(x), how do I find something that will annihilate this? It seems to me no matter how many derivatives you take, ... | 5 | [
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0.0... | 16,272 | 16272 | |
Compute the following summation please(!)
Hello, feyomi! $\text{Evaluate: }\;S \;=\;\sum^{\infty}_{n=1} \frac{n^2}{3^n}$ $\begin{array}{cccccccccc}<br /> \text{We have:} & S &=& \dfrac{1}{3} + \dfrac{4}{3^2} + \dfrac{9}{3^3} + \dfrac{16}{3^
4} + \dfrac{25}{3^5} + \dfrac{36}{3^6} + \hdots \\ \\[-2mm]<br /> \text{Multipl... | 5 | [
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0.072265625,
0.014282... | 16,273 | 16273 | |
Slant Asymptotes
Just like vertical and horizontal asymptotes, slant asymptotes are lines the graph approaches. They are also called oblique asymptotes.
A graph has a slant asymptote if the degree of the numerator is bigger than the degree of the denominator (there is no horizontal asymptote).
To find slant asymptote... | 4 | [
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0.02990722656... | 16,274 | 16274 | |
Irreducible polynomials
April 5th 2006, 08:51 PM
suedenation
Irreducible polynomials
Hi, does anyone know how to do the following questions?
In each of the following cases, find all roots of f(x) in F and factor f(x) as the product of irreducible polynomials in F[x].
(a) F=R, f(x) = (x^6)-1 in R[x]
... | 5 | [
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0.055... | 16,275 | 16275 | |
Differential Equations Help
February 5th 2009, 11:16 AM
jordanrs
Differential Equations Help
Stuck on the following problem, unsure of how to go around it
1a.
For what none values of k does the function $y=sinh (kt)$ satisfy the differential equation
$y'' - 25y = 0$
1b.
for those values ... | 4 | [
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0.002670288085937... | 16,276 | 16276 | |
Perpendicular vectors
October 24th 2009, 06:59 AM
dorwei92
Perpendicular vectors
1. Given the points O (0, 0, 0), P (2, 6, −1), Q (1, 1, 1) and R (4, 6, 2), find a vector that is perpendicular to both
(a) OP and OQ (b) PQ and QR (c) RP and QR
2. Find an equation of the plane passing through point P and... | 5 | [
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-0.05834... | 16,277 | 16277 | |
Trig substitution.. Please HELP !
July 29th 2009, 09:21 PM #1
Newbie
Joined
Jul 2009
Posts
1
Trig substitution.. Please HELP !
I really need some help with these trig substitution problems. Please write the u and du values for each. I'd really really appreciate it !
1) Integrate [e^x/(e^2x +1)] dx
... | 5 | [
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0.0390625,... | 16,278 | 16278 | |
Establishing Trig Identities
April 9th 2010, 08:44 AM #1
Newbie
Joined
Apr 2010
Posts
2
Establishing Trig Identities
Ive been working on this problem for quite some time now and i haven't been able to figure it out.
tanU(cscU-sinU)=cosU
this is what ive done so far
tanU*cscU - tanU*sinU
... | 4 | [
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Logarithem equation
please help me with this equation: Find the value of X such that: log2x + log232 = 6logx2
$<br /> \log _2 x + \log _2 32 = 6\log _x 2 \hfill \\$ $\Rightarrow \log _2 \left( {x \times 32} \right) = 6\left( {\frac{{\log 2}}<br /> {{\log x}}} \right) \hfill$ $\Rightarrow \log _2 \left( {32x}
\right) =... | 4 | [
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0.0786132812... | 16,280 | 16280 | |
Sum of Two Independent Random Variables (uniform)
February 3rd 2011, 06:12 PM
oisduda
Sum of Two Independent Random Variables (uniform)
Suppose X and Y are Uniform(-1, 1) such that X and Y are independent and identically distributed. What is the density of Z = X + Y?
Here is what I have done so far (I am ne... | 4 | [
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1.) Net electric field and 2.) Maximum electric field from centre of a ring
1. Problem1 statement, all variables and given/known data
In the figure particle 1 of charge q1 = -8.13q and particle 2 of charge q2 = +3.63q are fixed to an x axis. As a multiple of distance L, at what coordinate on the axis is the net electr... | 4 | [
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Relatively Prime
May 26th 2009, 08:45 AM #1
Relatively Prime
Show that $5n+3$ and $7n+4$ are relatively prime for all $n$.
So we can find integers $x$ and $y$ such that $(5n+3)x + (7n+4)y = 1$ for all $n$. But I don't think this would be a very efficient way of doing this because you have to check it for all... | 5 | [
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Calculus 2 limits as x-->0+
August 3rd 2010, 05:22 PM
JubJub1991
Calculus 2 limits as x-->0+
My teacher gave me this problem as an honors problem. She said that at one point I will have to use L'Hopitals rule to solve, but I have no idea where to start.
1. Evaluate the limit, if it exists.
l i m (x+1)^... | 5 | [
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Finitely generated subgroup implies cyclic
November 28th 2008, 07:23 AM
tttcomrader
Finitely generated subgroup implies cyclic
Let $G = \frac { \mathbb {Q} } { \mathbb {Z} }$ under +, so the elements are the equivalence classes $\hat {r} = \{ s \in \mathbb {Q} : s-r \in \mathbb {Z} \}$. Write $r \equiv s \ (mod ... | 5 | [
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There are, in a certain league, 20 teams, and each team face
Author Message
TAGS:
There are, in a certain league, 20 teams, and each team face [#permalink] 06 Jan 2011,... | 4 | [
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Tricky One Here!
January 14th 2008, 02:58 PM #1
Newbie
Joined
Jan 2008
Posts
5
Tricky One Here!
Hey guys, (and girls), I'm new here and I was wondering if someone could get me started on this problem:
Find y so that (4y+1)+(y+4)+(10-y) form a geometric series.
So far, I know the following:
... | 4 | [
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New User - Help questionse misc
January 16th 2011, 09:57 AM #1
Newbie
Joined
Jan 2011
Posts
4
New User - Help questionse misc
Hello i am a new user Fosky!
Currently starting my 9 out of 13 week program in TPP for university, im now starting to struggle this course mainly due to algebra, as the cours... | 4 | [
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[SOLVED] Some problems (limsup, liminf, ...)
March 10th 2009, 09:42 AM #1
[SOLVED] Some problems (limsup, liminf, ...)
Hi ^^
Probability again !
So now we're dealing with Borel-Cantelli's lemma, limsup and liminf, and associates... And this is desperating to see how it is difficult to grasp the concept... | 5 | [
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Two Empty Sets
Erland
. If two empty set were not equal, there would be one element in one of the sets which is not a member of the other set, and this is impossible, since an empty set has no member at all, whether
member or not member of another empty set.
This is wrong as the followinf argument shows:
WE know t... | 4 | [
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Patent US6259729 - Method of and an apparatus for training tap coefficients of an adaptive equalizer
BACKGROUND OF THE INVENTION
The present invention relates to a method of and an apparatus for training tap coefficients of an adaptive equalizer, and particularly to the method of and the apparatus for optimizing tap
c... | 4 | [
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More integration:evaluation
June 16th 2008, 08:22 PM #1
Junior Member
Joined
Apr 2008
Posts
72
More integration:evaluation
Just put a yes or no as to my answer =P, c is a constant, sorry about format and squareroots
1) integrate: (x^4-2x^3+5x+1)/(x^4) dx
I got: x -5/(2x^3) -3/(x^3) -2 +c
2... | 5 | [
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Mathematical And Physical Papers - Iii
66 ON THE EFFECT OF THE INTERNAL FRICTION OF FLUIDS
condition, and therefore steady motion would have been possible. By determining the arbitrary constants, and substituting in % we should have obtained
8 a r , 2 fr\l~*l ' a -5 ---- +r — & - f sm0... | 4 | [
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find the value that satisfies intial conditions
August 18th 2009, 11:31 AM #1
Member
Joined
Jul 2009
Posts
127
find the value that satisfies intial conditions
It is easy to check that for any value of c, the function
y=ce^–2x+e^–x
is solution of equation
y+2y=e^–x
Find the value of c for... | 4 | [
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You Can Calculate Slope Quickly and Easily with These TipsGradeAmathHelp.comYou Can Calculate Slope Quickly and Easily with These TipsGradeAmathHelp.com
How to Calculate Slope
Learning how to calculate slope is as easy once you kno... | 4 | [
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Factor Theroem
May 24th 2012, 09:54 AM #1
Newbie
Joined
Apr 2012
From
United Kingdom
Posts
6
Factor Theroem
Use the Factor Theorem to find the real number k such that (z – k) is a factor of z^3 + (-6 + 2j) z ^2 + (12 - 15j) z + (-9+27j)
Hence write z^3 + (-6 + 2j) z ^2 + (12 - 15j) z + (-9+27j) a... | 5 | [
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Patent US20070192397 - Cryptosystem Based on a Jacobian of a Curve
RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 09/886,147, filed Jun. 20, 2001, which is hereby incorporated by reference herein. U.S. patent application Ser. No. 09/886,147
claims priority to and the benefi... | 4 | [
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Solve each system by graphing...?
June 15th 2008, 09:05 PM
AlphaRock
Solve each system by graphing...?
What does it mean when a question asks: "Solve each system by graphing?"
Then:
A) y > .5x - 2
3x + 4y<6
B) 4x-y <= (less than or equal to) 8
y <= (less than or equal to) 5
x + 3y >6
... | 4 | [
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Position as a function of position?
In asap9993's equation, a dx = v dv, the quantity, a, is not a constant. a = kx, where k=1.8s^‒1
So, upon integrating, asap9993 dropped the 2 in the denominator on both sides.
kx·dx = v·dv → kx^2/2 + C/2 = v^2/2
→ (1.8s^‒1)x^2 + C = v^2 , which is what asap9993 had.
| 4 | [
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