content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Subsequences help, please!
November 13th 2007, 11:13 AM #1
LadyCheese
Guest
Subsequences help, please!
There is a sequence, <Xn>, such that the subsequence of even subscripts and odd subscripts both converge to x.
How would I show, using this, that the whole sequence <Xn> converges to x?
well, the seque... | 5 | [
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0.0893... | 18,600 | 18600 | |
Hedging for a single step market
March 29th 2010, 07:26 AM
Deadstar
Hedging for a single step market
I'm trying to understand this method correctly so I wrote my own problem. Can someone check to see that the problem itself makes sense and that I solved it right. (Numbers were chosen pretty much
at random bu... | 5 | [
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Solving trigonometric equations
April 21st 2009, 04:06 PM
etheen
Solving trigonometric equations
Solve over Real numbers:
a)5sin^2t+cos^2t-2=0 b)sec^2t+tantt=7 c)root of sint=2sint-1 d)tant-sintcost=0
Solve over [0, 2pi[ :
e)sin^2x-cos^2x=0 f)2tan^2x+3tanx-5=0 g)2sin^2x-sinx-1=0 h)6cos^2x+5cosx=0
... | 4 | [
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... | 18,602 | 18602 | |
Why Pi is wrong
I can't believe that on Physics Forums, of all places, two and a half pages worth of posters managed to miss this on the first page.
crocque
"Inside a regular inscribed hexagon, the radius of the circle is equal to the sides of the hexagon".
Picking at the use of "inside" would have made sense, but... | 4 | [
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[SOLVED] Closet Point/Sequentially compact subspace
August 11th 2008, 05:06 PM
Paperwings
[SOLVED] Closet Point/Sequentially compact subspace
Problem:
Let X be a metric space and let $K \subseteq X$ be a sequentially compact subspace. Let p be a point in X\K. Prove that there is a point $q_{0}$ that is close... | 5 | [
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Ellastic collision w/rebound
canicon25
1. The problem statement, all variables and given/known data
A 150 kg cart moving at 13 m/s east collided with a 420 kg wagon moving at 5.0 m/s east.
The cart rebounded westward with a speed of 3.0 m/s . What was the speed of the wagon after the collision? Observe standard Car... | 4 | [
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PinkMonkey.com-Trigonometry Study Guide - 2.4 Tables of Trigonometric Function
2.4 Tables of Trigonometric Function
When solving problems using trigonometric functions, either the angle is given and the value of t-function must be found, or the value of the t-function is given and angle must be found.
These two p... | 4 | [
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V of solid rev..........
February 26th 2010, 08:14 AM
wolfhound
V of solid rev..........
Hi,
I have done the question on the picture attached
I don't believe it could be the correct answer, can someone help me please
Thanks
February 26th 2010, 08:28 AM
wolfhound
actually should my answer be 1... | 5 | [
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Math Help
September 20th 2009, 12:29 PM #1
Junior Member
Joined
Sep 2008
Posts
71
f'(x)
Let g(x)=1-lxl.
(a) Evaluate f'(2).
(b) Evaluate f'(-3).
(c) Does f'(0) exist?
For (c) I believe that f'(0) does not exist because it is not locally linear. However for (a) and (b) I do not know how ... | 5 | [
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Patent US20030222440 - Three dimensional occupant position sensor
BACKGROUND OF THE INVENTION
[0001] The present invention relates to vehicle occupant safety systems, and more particularly, to a vehicle occupant proximity sensor for use with a vehicle occupant safety system.
[0002] Vehicle occupant safety systems tha... | 4 | [
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Math B Regents Help?
June 10th 2007, 04:55 PM #16
Junior Member
Joined
Jun 2007
Posts
38
The binomial theorem says:
$(a + b) = a^n + [ _nC_1 ]a^{n - 1}b^1 + [ _nC_2 ]a^{n-2}b^2 + ... + [ _nC_{n-1} ]a^1b^{n-1} + b^n$
Where $_nC_r = \frac{n!}{r!(n - r)!}$
(Where n is a positive integer.)
He... | 4 | [
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Multi-Period Mean-Variance Portfolio Selection with Uncertain Time Horizon When Returns Are Serially Correlated
Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 216891, 17 pages
http://dx.doi.org/10.1155/2012/216891
Research Article
Multi-Period Mean-Variance Portfolio Selection with Uncertain Time... | 5 | [
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A tank contains 10,000 gallons of a solution that is 5 %
Author Message
TAGS:
A tank contains 10,000 gallons of a solution that is 5 % [#permalink] 11 Oct 2005, 02:04
2
... | 4 | [
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Some Estimates of Rough Bilinear Fractional Integral
Journal of Function Spaces and Applications
Volume 2012 (2012), Article ID 406540, 17 pages
http://dx.doi.org/10.1155/2012/406540
Research Article
Some Estimates of Rough Bilinear Fractional Integral
^1Department of Mathematics, Zhejiang University, Hangzhou 31002... | 5 | [
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AB=BC=CD=ED=EF=FG=GA , Find Angle DAE
Author Message
TAGS:
AB=BC=CD=ED=EF=FG=GA , Find Angle DAE [#permalink] 08 Mar 2010, 14:04
2
... | 4 | [
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evaluating a limit with ln
October 31st 2009, 11:18 AM #1
Member
Joined
Feb 2009
Posts
91
evaluating a limit with ln
Hi
So the limit is
lim x ( ln (x+5) - ln x)
x-> infinity
so everything goes to infinity as x goes to infinity but I don't think I can use l'Hospital's rule b/c it is not... | 5 | [
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Solving Tri equation
December 7th 2009, 09:43 AM #1
Newbie
Joined
Nov 2009
Posts
11
Solving Tri equation
Having trouble with this question.
Determine exact solutions for sin3x + square root 3 / 2 =0, where 0 <= theta <= 2 pi
$\sin 3x + \frac{\sqrt{3}}{2} = 0$
$\sin 3x = \frac{-\sqrt{3}... | 4 | [
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Formula Question
March 11th 2009, 07:58 PM #1
Newbie
Joined
Mar 2009
Posts
15
Formula Question
Alright so I have two equations that the paper is giving me to simplify, only problem is I don't know where to start.. and my text book isn't being helpful, so I was wondering if anyone could
point me in th... | 4 | [
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Math Help
February 11th 2010, 10:10 AM #1
Member
Joined
Mar 2009
Posts
84
mrs
MRS=y/2x
price of x is $1
price of y is $3
income is $90
how much of each good should be consumed in order to maximize utility
Utility is maximised when $MRS_{y,x}=\frac{P_x}{P_y}$
so $\frac{y}{2x}=\fr... | 4 | [
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Some Questions in probability and statistics
January 16th 2011, 10:31 AM #1
Newbie
Joined
Jan 2011
Posts
6
Some Questions in probability and statistics
1. Let X~Pois(1) what is the variance of X given x is bigger than 0?
a. (e-2)/(e-1)
b. e/(e-1)
c. 1/(e-2)
d. e(e-2)/(e-1)^2
I've tri... | 5 | [
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Volume of Cone in R3
May 2nd 2011, 01:15 PM #1
Member
Joined
Apr 2008
Posts
137
Thanks
4
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]
... | 5 | [
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Blowup of Smooth Solutions for an Aggregation Equation
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 531046, 5 pages
http://dx.doi.org/10.1155/2013/531046
Research Article
Blowup of Smooth Solutions for an Aggregation Equation
^1College of Electrical and Information Engineering, Hunan University, Chan... | 4 | [
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... | 18,621 | 18621 | |
Neural Decision Boundaries for Maximal Information Transmission
Abstract
We consider here how to separate multidimensional signals into two categories, such that the binary decision transmits the maximum possible information about those signals. Our motivation comes from
the nervous system, where neurons process multi... | 4 | [
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Hard Series Question
July 25th 2010, 03:51 AM #1
Junior Member
Joined
Apr 2010
Posts
29
Hi
For this question:
The sequences {1, 3, 5, ……,
p} and {1, 3, 5, ………, q} contain the integer values of
p
and q respectively.
Find the value of p+q if :
{1 + 3 + 5 + ……+ p} +{1 + 3 +... | 4 | [
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-0.01092529296... | 18,623 | 18623 | |
Physics Forums - Trying to determine initial thrust on an object from angular velocity?
sleepycoffee Feb18-13 03:09 PM
Re: Trying to determine initial thrust on an object from angular veloc
Hi, unfortunately you can't add the angular velocities of the wheels like that. Just like your car has four wheels going 60 m... | 4 | [
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0.0424... | 18,624 | 18624 | |
Prove a group
April 22nd 2009, 03:09 PM #1
Junior Member
Joined
Nov 2008
Posts
37
Prove a group
Prove that real number pairs $(a, b)$, where $aeq 0$, with operation $\circ$ form a group.
$(a, b) \circ (c,d)=(ac, ad + b)$.
With what kind of mathematical concept and operation this group coincide?
... | 4 | [
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0.016... | 18,625 | 18625 | |
Need [Quick] Help for Proof About Linear Transformations
September 17th 2012, 06:02 PM
skeptopotamus
Need [Quick] Help for Proof About Linear Transformations
Hi, I am TA'ing a graduate course on linear algebra this semester, and we have come up to a theorem that I cannot prove myself without resorting to Schur's... | 5 | [
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0.0128784179687... | 18,626 | 18626 | |
The principle of equivalence
SinghRP
To PeterDonis: Answer to "What makes you think that?
I get lost in mathematical jungle. I am a physicist, and I like to think in terms of physical models. I recall Feynman also: The glory of mathematics is that you don't have to say what you are
talking about.
The genesis of POE... | 4 | [
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0.0150146484375,
0.10107421875,
-0.0115966796875,
0.0419921875,
-0.0103759765625,
0.0869140625,
-0.087890625,
0.00799560546875,
0.037353515625,
-0.033447265625,
-0.0654296875,
0.039306640625,
-0.038... | 18,627 | 18627 | |
What is the Physical meaning of Bogoliubov transformation
I would explain it in this way - for a system of noninteracting fermions with hamiltonian
ham = sum_k c^+_k_up c_k_up + c^+-_k_down c^-_k_down
you can apply the fermi-dirac statistic, which says that a one-electron state |i> is occupied with probability
< c^+... | 4 | [
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0.004425048828125,
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-0.059814453125,
0.0693359375,
0.0... | 18,628 | 18628 | |
Simultaneous Equations
December 5th 2010, 06:40 AM #1
Junior Member
Joined
Sep 2009
Posts
66
If (1,p) is a solution of the simultaneous equations
12x(square) - 5y(square) = 7
2p(square)x - 5y = 7
find the value of p and the other solution.
$12x^2-5y^2=7$
$2p^2x-5y=7$
$12x^2-5y... | 4 | [
-0.01904296875,
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-0.021484375,
0.0625,
-0.027587890625,
-0.00848388671875,
-0.0869140625,... | 18,629 | 18629 | |
i need some help deriving inverse trig functions
December 3rd 2009, 11:21 AM #1
Member
Joined
Sep 2009
Posts
105
i need some help deriving inverse trig functions
i have to show that dy/dx= (x+y)/(x-y) if arctan (y/x)= log(sq.rt.(x^2 + y^2))
i was able to get everything before this, but i dont really... | 5 | [
-0.02587890625,
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0.043212890625,
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0.041015625,
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-0.040283203125,
0.035888671875,
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-0.00677490234375,
-0.05786... | 18,630 | 18630 | |
Factoring the equation z^(n)-1=0 where z is a complex number
TogoPogo
Thanks! I guess the real problem that confuses me is how the factorization of z^n - 1 = 0 can be used to prove the theorem that the product of the distances is equal to n...
EDIT: Is there any way to express the distance of, for example, |z0-z2| ... | 5 | [
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Running FFT
Some applications need DFT frequencies of the most recent NN samples on an ongoing basis. One example is DTMF, or touch-tone telephone dialing, in which a detection circuit must constantly monitor
the line for two simultaneous frequencies indicating that a telephone button is depressed. In such cases, most ... | 4 | [
-0.06298828125,
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0.046630859375,
0.005126953125,
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0.... | 18,632 | 18632 | |
Physics Forums - View Single Post - Pressure vessels
Pressure vessels
I'm actually interested in a bizarre physics point, so the theoretical answer is fine.
I wanted to see if the intergal of the trace of the classical stress-energy tensor
(T_11+T_22+T_33)*dV
(dV = volume element) was zero for the entire pressure ... | 4 | [
-0.056396484375,
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-0.0478515625,
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0.0001... | 18,633 | 18633 | |
Exponential form
January 14th 2009, 04:47 PM #1
Super Member
Joined
Mar 2006
Posts
705
Thanks
2
Exponential form
Write $-1+i$ in exponential form.
So far I have $\sqrt {2} [ ( - \cos ( \frac { \pi }{4} )+ i \sin ( \frac { \pi }{4}) ]$, but then how do I make it look like $\sqrt {2} e^ { i \frac ... | 4 | [
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-0.04150390625,
-0.0111083984375,
-0.025268554687... | 18,634 | 18634 | |
fourier transform
October 18th 2008, 02:26 PM
marianne
fourier transform
I need to find the Fourier transform for the following function:
$f: \mathbb{R}^n \rightarrow \mathbb{R}$
$f(x)=e^{-\pi a |x|^2}$
I'm a newbie when it comes to Fourier transforms so any help would be great.
Thank you.
Oc... | 5 | [
-0.060791015625,
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0.009399... | 18,635 | 18635 | |
Math Help
February 3rd 2011, 12:18 PM #1
Newbie
Joined
Feb 2011
Posts
3
Continuity
Hey everyone, I can't figure this problem out:
Find the constants a and b that will make the following function continuous everywhere.
f(x)=
□ $a cosx$ if x<0
□ sin $\left(\frac{pi}{2}x+3)$ if 0<=x... | 4 | [
-0.0849609375,
-0.02197265625,
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0.11328125,
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0.11181640625,
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0.004852294921875,
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0.10009765625,
0.00970458984375,
-0.01232910... | 18,636 | 18636 | |
Integral problem
November 13th 2007, 09:11 AM #1
Junior Member
Joined
Jan 2007
Posts
35
Integral problem
Find f(x) if f(1) = -1 and the tangent line at (x, f(x)) has slope 2e^x + 1
This is a problem that was thrown into my indefinite integral homework, and I'm kinda stuck.
any help appreciated.... | 4 | [
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-0.0498046875,
-0.0629882... | 18,637 | 18637 | |
Sinusoidal Functions
December 17th 2008, 11:31 AM #1
Junior Member
Joined
Dec 2008
Posts
35
Sinusoidal Functions
12/15
I have the following math problem:
Kala is jumping rope, and the rope touches the ground every time she jumps. She jumps at the rate of 40 jumps per minute, and the distance fr... | 4 | [
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0.0329589843... | 18,638 | 18638 | |
URGENT HELP Required re. Statistical Inference - PLEASE!! ;-)
May 7th 2007, 06:32 AM #1
Newbie
Joined
May 2007
Posts
6
URGENT HELP Required re. Statistical Inference - PLEASE!! ;-)
Hello,
I've lost my revision notes for an exam tomorrow (I know, I know!) and I was hoping someone could help me with t... | 5 | [
0.0059814453125,
0.08935546875,
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-0.0034027099609375,
-0.047363... | 18,639 | 18639 | |
can't figure this inequality
May 25th 2012, 03:33 PM
MathFan
can't figure this inequality
$(M^2+2MN-N^2 )^2<(M^2-2MN-N^2 )^2$
I went about it like this
$M^2+2MN-N^2<M^2-2MN-N^2\ \ \ \ \ \ \ \ (1)$
$M^2+2MN-N^2>-M^2+2MN+N^2\ \ \ \ \ \ (2)$
$(1)$
$M^2+2MN-N^2<M^2-2MN-N^2$
$2MN<-2MN$
... | 4 | [
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0.03857421875,
0.06640625,
-0.0125122070312... | 18,640 | 18640 | |
Calculate some weird RV's variance
July 10th 2010, 08:04 AM #1
Junior Member
Joined
Jan 2010
Posts
26
Calculate some weird RV's variance
Can you help me with something? I get stuck everytime i try to solve the following problem.
Let Xi, 1<=i<=10 be independent random variables such that EXi = 10 and... | 4 | [
-0.05126953125,
-0.0634765625,
0.047119140625,
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0.046630859375,
0.029541015625,
0.032470703125,
-0.028564453125,
-0.02294921875,
-0.03857421875,
0.02685546875,
0.06591796875,
-0.048583984375,
-0.01141357421875,
0.043701171875,
-0.0032806396484375,
-0.0380859375,
0.026... | 18,641 | 18641 | |
Limit Question
November 7th 2006, 05:13 PM
Ideasman
Limit Question
I'm confused:
Why is the limit(as x -> 0) sin(x)/(x-sin(x)) = infinity?
I have done this 10 times now, and I get that it equals -1.
We have an indeterminant form when we plug 0 in (0/0). Thus, I can use l'hopitals rule.
Then:
... | 5 | [
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0.01202392578125,
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0.0164794921875,
-0.... | 18,642 | 18642 | |
Ecological Archives
Ecological Archives A017-025-A1
Corey J. A. Bradshaw, David W. Sims, and Graeme C. Hays. 2007. Measurement error causes scale-dependent threshold erosion of biological signals in animal movement data. Ecological App... | 4 | [
0.03466796875,
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0.012939453125,
0.026123046875,
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0.051025390625,
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0.060302734375,
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0.0025177001953125,
-0.06494140625,
0.... | 18,643 | 18643 | |
A Sum Operator Method for the Existence and Uniqueness of Positive Solutions to a System of Nonlinear Fractional Integral Equations
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 731065, 6 pages
http://dx.doi.org/10.1155/2013/731065
Research Article
A Sum Operator Method for the Existence and Uniqueness... | 5 | [
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0.034912109375,
-0.02917480... | 18,644 | 18644 | |
Basic indices question
October 10th 2011, 12:26 PM #1
Newbie
Joined
Oct 2011
Posts
2
Basic indices question
First I'd like to say hi since this is my first post on the forum and it looks great and I look forward to talking maths with you guys in the future.
As for my question, I'm stumped on a littl... | 4 | [
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-0.07373046875,
-0.0... | 18,645 | 18645 | |
Stepped Attenuator
post #16 of 31
6/24/01 at 4:20pm
Thread Starter
Hello,
Getting the exact logarithmic values shown here is NOT necessary. Do few linear approximations and curve fit the function.
This is actual calculations that I have made.
Requirements: 50K 12 steps -> 11 resistors
50 = C * (Exp(r * 11) - 1)
... | 4 | [
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0.0018157958984375,
0.0130615234375,
0.09423828125,
-0.0625,
0.02392578125,... | 18,646 | 18646 | |
FInding a transition matrix
July 13th 2008, 04:53 PM #1
Junior Member
Joined
Mar 2007
Posts
40
FInding a transition matrix
I know how to do this when the identity matrix is involved but not otherwise. For example can I get a step-by-step process of how this is done:
Let B = [u1, u2] and B' = [v1, v2... | 5 | [
-0.0281982421875,
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-0.0026092529296875,
0.007598876953125,
0.01153564453125,
0.0712890625,
-0.069824218... | 18,647 | 18647 | |
Help on Photoelectric Effect problem
Reshma
a] A beam of light of wavelength 400nm and power 1.55mW is directed at the cathode of a photoelectric cell. If only 10% of the incident photons effectively produce photoelectrons, find the current
due to these electrons.
b]If the wavelength of light is now reduced to 20... | 5 | [
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-0.0012054443359375,
-0.057861328125... | 18,648 | 18648 | |
integrals
May 6th 2007, 09:39 PM #1
Newbie
Joined
May 2007
Posts
4
integrals
Hi, I reall need help on these two problems:
Let A = integral_0^1 (e^t)/(t+1) dt. Express the values of the following integrals in terms of A.
A) integral_(a-1)^a (e^-t)/(t-a-1) dt. (the integral from a-1 to a)
B)... | 4 | [
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0.0791015625,
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0.0179443359375,
-0.0390625,
0.0712890625,
0.038818359375,
-0.0218505859375,
-0.011962890625,
0.004669189453125,
-0.0380859375,
-0.029541015625,
-0.0849609375,
-0.0610351562... | 18,649 | 18649 | |
Generalized Synchronization of Stochastic Discrete Chaotic System with Poisson Distribution Coefficient
Discrete Dynamics in Nature and Society
Volume 2013 (2013), Article ID 981503, 8 pages
http://dx.doi.org/10.1155/2013/981503
Research Article
Generalized Synchronization of Stochastic Discrete Chaotic System with P... | 5 | [
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-0.0037078857421875,
-0.036865234375,... | 18,650 | 18650 | |
How do I integrate (sinx)^6 ?
February 27th 2010, 05:41 AM #1
Super Member
Joined
Nov 2008
Posts
597
How do I integrate (sinx)^6 ?
I could integrate (sinx)^4 by doing (sin^2 x)^2 for example and then using the half angle formula (1 - cos(2x))/2 but I can't do that for (sinx)^6 and Wolfram tells me to use... | 5 | [
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0.05029296875,
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0.... | 18,651 | 18651 | |
simplifying and proving identities
July 16th 2008, 05:08 PM
Dave19
simplifying and proving identities
degrees=(d)theta=(t) alpha=(a) beta=(B) pie(p)squared=(s)
it will make much more sense if you use these.
comment:just do the ones you know you don't have to do all of them.
also write it out on paper... | 4 | [
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-0.029541015625,
0.06933... | 18,652 | 18652 | |
Any one good with standard deviations please help
January 16th 2009, 05:21 PM #1
Junior Member
Joined
Jan 2009
Posts
31
A sample of 15 observations has a standard deviation of 4. The sum of the squared deviations from the sample mean is?
1.) 19
2.)56
3.)60
4.) 224
5.)240
I'm st... | 4 | [
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-0.0101318359375,
0.04467... | 18,653 | 18653 | |
Lorentz boosts and rotation matrices
P: 30
I also posted this in the homework help for introductory physics, but it wasn't getting any responses, so I guess it's slightly more advanced.
1. The problem statement, all variables and given/known data
Let L_b(a) denote the 4x4 matrix that gives a pure boost in the directi... | 4 | [
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0.119140625,
-0.083984375,
-0.... | 18,654 | 18654 | |
Inertia Moment for Racing Motorcycle Wheels
I defer to Keith Code:
http://www.vf750fd.com/blurbs/countercode.html
Note the "no bs" motorcyle is a 600 road racer replica, with little trail effect. When there is little trail effect, then body leaning can't be used to steer a motorcycle. On street motorcycles, at
least ... | 4 | [
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C
It is expected that a very general Calabi-Yau complete intersection in the projective space does not admit a dominant rational endomorphism of degree $>1$. I will give a sketch of my proof of
this statement and discuss some of its consequences.
We will discuss the construction and applications of Calabi-... | 4 | [
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Converging Subsequence
March 9th 2010, 07:43 PM
harish21
Converging Subsequence
Suppose that a sequence { $x_n$} is monotone and that it has a convergent subsequence. Show that { $x_n$} also converges.
I think that "since the subsequence is convergent, the sequence { $x_n$} is bounded", and
according to... | 5 | [
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2009.9: A New Scaling and Squaring Algorithm for the Matrix Exponential
2009.9: Awad H. Al-Mohy and Nicholas J. Higham (2009) A New Scaling and Squaring Algorithm for the Matrix Exponential.
There is a more recent version of this eprint available. Click here to view it.
Full text available as:
PDF - Requires a PD... | 4 | [
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series
May 16th 2010, 07:48 PM
Random Variable
series
Challenge Problem:
Find the sum of $\frac{1}{1 \cdot 2 \cdot 3 \cdot 4} + \frac{1}{5 \cdot 6 \cdot 7 \cdot 8} + \frac{1}{9 \cdot 10 \cdot 11 \cdot 12} + ...$
Moderator editor: Approved Challenge question.
May 16th 2010, 08:36 PM
simplependulum
... | 5 | [
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Running Around a Track
October 24th 2013, 03:34 PM #1
Newbie
Joined
Aug 2013
From
United States
Posts
12
Running Around a Track
Hello, helpful people. I'm in some need of help.
I'm not the best at setting up equations for word problems, especially those related to time. Therefore, it'd be the gr... | 4 | [
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How to remember when to add and when to multiply exponents?
jbunniii
It might help to think about the special case of powers of 2. For example, ##(2^2)(2^3) = (4)(8) = 32##, which equals ##2^{2+3}##, not ##2^{2 \times 3}##. One way to remember this is to consider the
binary representation:
$$2^2 = 000010, 2^3 = 0001... | 4 | [
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... | 18,661 | 18661 | |
Augmented Matrix with constants
September 3rd 2011, 08:26 AM #1
Newbie
Joined
Sep 2011
Posts
4
Augmented Matrix with constants
How would you solve a matrix with constants inside of it (such as h,k). An example I was given was
-7x + 3y + 4z = 3
-4x - 4y - 4z = -5
29x -y + h = k
and was tol... | 4 | [
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solving equations with fractions
need help on solving these problems $1/5x+27=22$ $1/2x-29=-22$ $3x/5+22=28$ $14-2x/3=18$
If I understand what you mean, you want to solve for x in each of those 4 equations, and 1/5x is actually (1/5)x or x/5. So, x/5 +27 = 22 Collect like terms, numbers with numbers, unknowns with
unk... | 4 | [
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I am having trouble figuring out how to solve a conic line collision problem.
February 21st 2011, 07:50 PM
thyrgle
I am having trouble figuring out how to solve a conic line collision problem.
The problem in my book about conics states:
"A hyperbolic mirror is a mirror in the shape of one branch of a hyperb... | 4 | [
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... | 18,664 | 18664 | |
Math Help
July 17th 2006, 09:56 PM #1
Junior Member
Joined
Jun 2006
Posts
59
equation
Sixty cookies were to be equally distributed to x campers. When 8 campers did not want the cookies, the other campers each received 2 more cookies. Which of the following equations could be used
to find the number ... | 4 | [
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l'Hôpital's rule for a complex function
April 5th 2010, 03:04 PM #1
Member
Joined
May 2008
Posts
171
l'Hôpital's rule for a complex function
Hey guys.
Can I use l'Hôpital's rule for a complex function?
Lets say I want to investigate the behavior of function sin(z)/z around z=0, can I use it?
... | 5 | [
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U-sub definite integral
May 4th 2009, 11:14 PM
AngloSaxonProtestant
U-sub definite integral
The integral on 0 to 8 of g(u)du = 15
What is the integral on 0 to 64 of g(t/8)?
What is the integral on 0 to 8 of g(8-t)?
May 4th 2009, 11:20 PM
TheEmptySet
Quote:
$\int_{0}^{64}g\left(\frac{t}{8} ... | 4 | [
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On the Modeling of the Synovial Fluid
Advances in Tribology
Volume 2010 (2010), Article ID 104957, 12 pages
http://dx.doi.org/10.1155/2010/104957
Research Article
On the Modeling of the Synovial Fluid
^1Mathematical Institute, Charles University, Sokolovská 83, 18675 Prague, Czech Republic
^2Department of Mechanical... | 4 | [
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Multiparameter Fractional Difference Linear Control Systems
Discrete Dynamics in Nature and Society
Volume 2014 (2014), Article ID 183782, 8 pages
http://dx.doi.org/10.1155/2014/183782
Research Article
Multiparameter Fractional Difference Linear Control Systems
Faculty of Computer Science, Bialystok University of Te... | 5 | [
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0.01513... | 18,669 | 18669 | |
Ensemble Fractional Sensitivity: A Quantitative Approach to Neuron Selection for Decoding Motor Tasks
Computational Intelligence and Neuroscience
Volume 2010 (2010), Article ID 648202, 9 pages
http://dx.doi.org/10.1155/2010/648202
Research Article
Ensemble Fractional Sensitivity: A Quantitative Approach to Neuron Sel... | 4 | [
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... | 18,670 | 18670 | |
Geometry(2)
December 3rd 2009, 04:14 PM #1
Geometry(2)
Problem(1): Let $P_n$ be a regular $n$-gon with points $Q_1,\cdots,Q_n$. Fix one point $Q_i\quad 1\le i\le n$ and define $D_k$ as the distance from $Q_k$ to $Q_i$. Evaluate $\prod_{\stackrel{k=1}
{\scriptstyle{k}e i}}^{n}D_k$
Problem(2): What about ... | 5 | [
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Textbook answer is wrong?
1. The problem statement, all variables and given/known data
Is the answer provided by the textbook solution manual wrong?
Here is the textbook exercise:
A bob with a mass of 0,500 kg is on the end of a long chord and suspended on a pivot (no friction). The distance of the center of mass of ... | 4 | [
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... | 18,672 | 18672 | |
Area of Figures and Similar Figures
In rhombus ABCD, AB=18 and AC=26. Find the area of the rhombus to the nearest tenth.
From equation : $|AB|^2=\left(\frac{|AC|}{2}\right)^2+\left(\frac{| BD|}{2}\right)^2$ you can find value of $|BD|$ an after that calculate area $A$ : $A=\frac{|AC|\cdot |BD|}{2}$
have you made a sk... | 4 | [
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0.... | 18,673 | 18673 | |
Prove that each of the following is an identity
April 18th 2009, 01:44 PM #1
Newbie
Joined
Apr 2009
From
Arizona
Posts
1
I am frustated with these two problems, i can not figure them out, ive tried many identities but still no correct answer.
The problems are
#1.) (1+cot(x))^2-cot(x)=1/(1-cos... | 4 | [
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Basic Operator question
genericusrnme
Yeah, I kept coming to that conclusion too yet what I wrote is what is in Sakurai's book..
[itex]i\ \hbar \partial_t \rho = H \rho \neq -[\rho , H][/itex]
Where [itex]\rho = \sum_n w_n |a_n \rangle \langle a_n |[/itex]
I'll attatch an extract
OK, the point there is that [ite... | 4 | [
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-0.0344238... | 18,675 | 18675 | |
a maximum problem with cuboids!
November 21st 2009, 04:23 AM #1
Junior Member
Joined
Nov 2009
Posts
27
Hi, I'm new to this forum. I hope you can help me with this problem.
A block of wood in the shape of a cuboid is to have square ends. What is the volume of the largest block if the sum of the length... | 4 | [
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Patent US6556203 - Tile-based digital differential analyzer rasterization
COPYRIGHT NOTICE
Contained herein is material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction of the patent disclosure by any person as it appears in the
Patent and Trademark Office pat... | 4 | [
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Set Prove or Disprove
August 31st 2009, 08:41 AM #1
Newbie
Joined
Aug 2009
Posts
8
Set Prove or Disprove
Last help i need for today
Prove or Disprove:
(A multiply C) Union (B multiply D) = (A Intersection B) multiply (C Intersection D).
Please help...
When multiply is coming in SET, m... | 4 | [
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... | 18,678 | 18678 | |
Rational and irrational numbers
February 11th 2009, 07:43 PM
noles2188
Rational and irrational numbers
True or false
Between any two unequal irrational numbers there is a rational number.
I'm leaning towards true, but I can't come up with a convincing argument.
February 12th 2009, 02:42 AM
clic-clac
... | 5 | [
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0.10400390625,
-0.02258300781... | 18,679 | 18679 | |
Solving for constants
October 17th 2012, 07:03 AM #1
Member
Joined
Nov 2008
Posts
92
Solving for constants
Hi,
I have the following equation:
$x(t) = ABexp(BCt)$
I also have a graph of $x(t)$ plotted against $t$. I should determine the constants $A, B, C$ using the equation and the graph.
... | 4 | [
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[Haskell-cafe] ghci stack overflow
Daniel Fischer daniel.is.fischer at web.de
Mon Nov 20 10:37:06 EST 2006
Hi Jim,
Am Montag, 20. November 2006 01:13 schrieb jim burton:
> This code produces a stack overflow in ghci when I call `makeSpiral' with
> large values, e.g. big enough to produce a 1001x1001 spiral. (makeSpi... | 4 | [
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Physics Forums - Interchange of limit operations
Interchange of limit operations
1. The problem statement, all variables and given/known data
Find a sequence of continuous functions [tex]f_n: R \rightarrow R[/tex] such that [tex]lim_{x \rightarrow 0}lim_{n \rightarrow \infty}f_n(x) [/tex] and [tex]lim_{n \rightarro... | 5 | [
-0.1611328125,
-0.03466796875,
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About degrees of freedom of fermions
karlzr
Is it possible to come to this conclusion from pure algebra. I don't understand which two complex dofs are set to zero.
Consider ##u(p)##, the Fourier component of the Dirac field with momentum ##p##. This is a complex four-component spinor, so we might think that it has ... | 4 | [
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Another partial derivative problem...
January 15th 2007, 05:56 PM #1
Member
Joined
Jun 2006
Posts
93
Another partial derivative problem...
If f(x,y,z) = (x^3 + y^2 + z)^4 find each of the following:
a) fx(x,y,z)
b) fy(0,1,1)
c) fzz(x,y,z)
For a) I got 4(x^3 + y^2 + z)(3x^2)
b) 4(x^... | 5 | [
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Newtons Law of Cooling
March 10th 2011, 02:23 AM #1
Newbie
Joined
Mar 2011
Posts
5
Hi all,
Ive been trying to work this question out on my own for over a week now and cant seem to crack it. I hope its in the right Sub forum and im really sorry if its not.
A hot metal body is allowed to cool in s... | 4 | [
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A Partial Backlogging Inventory Model for Deteriorating Items with Fluctuating Selling Price and Purchasing Cost
Advances in Operations Research
Volume 2012 (2012), Article ID 385371, 15 pages
http://dx.doi.org/10.1155/2012/385371
Research Article
A Partial Backlogging Inventory Model for Deteriorating Items with Flu... | 5 | [
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Double integral
January 31st 2011, 10:15 AM #1
Junior Member
Joined
Jun 2010
Posts
59
Double integral
Dear all some naive question.
If I have a double integral over a x,y area.
Usually this process is like this
I calculate the integral for x and plugging in the two limits of x and then I fe... | 5 | [
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Fault Severity Estimation of Rotating Machinery Based on Residual Signals
Advances in Mechanical Engineering
Volume 2012 (2012), Article ID 518468, 8 pages
http://dx.doi.org/10.1155/2012/518468
Research Article
Fault Severity Estimation of Rotating Machinery Based on Residual Signals
School of Mechanical Engineering... | 4 | [
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Solving Bernoulli equations
February 2nd 2009, 06:05 PM #1
Newbie
Joined
Feb 2009
Posts
1
I am in a class on differential equations and do not understand how to solve Bernoulli equations. Here is the problem I have been working on:
y' = ry - k(y^2) , r>0 , k>0
So far I have divided both sides by... | 4 | [
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COntinuity
September 6th 2012, 07:58 PM
mfxuus
COntinuity
Hey guys,
I'm trying to prove that f(x)=x^4 is continuous on R, using the e-delta argument, but I can't find a way to break up x^4-a^4 effectively in the forms of x-a. ANybody have any idea here?
I appreciate any hints and help!
Thanks a lo... | 5 | [
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Answers
Interference, Polarization and Color Review
Navigate to Answers for:
Questions #1-#11
Questions #12-#20
Questions #21-#28
Part B: Diagramming, Analysis, Calculations
21. Two point sources are vibrating together (in phase) at the same frequency to produce a two-point source interference pattern. The diagr... | 4 | [
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Isomorphism
Well the correct answer to any question is true ;). Is your question the following: If there exists a surjective homomorphism f : R -> S and a surjective homomorphism g : R -> T, what is the relation
between S and T? Well we know S = R/Ker(f), and T = R/Ker(g). We know Ker(f) and Ker(g) are ideals. Moreove... | 4 | [
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Chain Rule Problem
March 20th 2010, 10:53 AM
A Beautiful Mind
Chain Rule Problem
$sin^2(x^2) = sin(x^2)cos(x^2)$
I need to know how to get this part.
Here's the problem:
$f(x) = sin^2(x)sin(x^2)sin^2(x^2)$
Now it's obvious that you can use the product rule to differentiate the three of these,... | 5 | [
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vector problem
December 29th 2011, 11:41 PM
arangu1508
vector problem
Kindly guide me in the following vector problem:
Magnitude of a velocity vector is 10 m/s. If theta = 30 degrees, find its (i) x component (ii) y component. Theta is measured from +ve side of the y-axis. Hope I have made myself clear.
... | 4 | [
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Power Set of N-Intersection of
July 21st 2012, 07:26 AM #1
Newbie
Joined
Jul 2012
From
the Netherlands
Posts
3
Power Set of N-Intersection of infinitely many finite subsets of N
Hello everyone,
This is a problem I'm having a hard time solving:
Let $P(\mathbb{N})$= the power set of $\mathbb{... | 5 | [
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[SOLVED] Rational Roots and Factoring
January 19th 2010, 08:52 PM #1
Member
Joined
Sep 2009
Posts
158
[SOLVED] Rational Roots and Factoring
This is my polynomial:
5x^5 - 6x^4 - 24x^3 + 20x^2 + 7x - 2 = 0
I found the rational roots and from that found some factors:
(x-1)(5x-1)(x +2)
I ... | 4 | [
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Modular Arithmetic
March 27th 2010, 10:08 PM
adkinsjr
Modular Arithmetic
I'm having a hard time understanding modular numbers and aritmetic.
If I have $r=a(\mod P)$, then $r-a=bP$ where $b$ is an integer. So if I want to find 23 in $\mod 12$, I write $r=23(\mod 12)$ which should turn out to be 11 right? So ... | 4 | [
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First order nonlinear differential equation
1. The problem statement, all variables and given/known data
Find the orthogonal trajectories of the given families of curves.
[tex]x^2 + y^2+2Cy=1[/tex]
2. Relevant equations
The book has covered homogeneous and separable methods.
3. The attempt at a solution
To find t... | 5 | [
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Stability in Terms of Two Measures for Nonlinear Impulsive Systems on Time Scales
Journal of Applied Mathematics
Volume 2013 (2013), Article ID 313029, 12 pages
http://dx.doi.org/10.1155/2013/313029
Research Article
Stability in Terms of Two Measures for Nonlinear Impulsive Systems on Time Scales
^1School of Control... | 5 | [
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