content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
A Model to Partly but Reliably Distinguish DDOS Flood Traffic from Aggregated One
Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 860569, 12 pages
http://dx.doi.org/10.1155/2012/860569
Research Article
A Model to Partly but Reliably Distinguish DDOS Flood Traffic from Aggregated One
^1School of I... | 4 | [
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complicated logarithmic differentiation
February 19th 2009, 11:48 PM #1
Newbie
Joined
Feb 2009
Posts
17
complicated logarithmic differentiation
i'm so sorry for keep asking questions but im really confused for this one.
the problem is y=(e^(x-1)*sin^2*x)/(((x^2)+5)^2x)
the trig function (sin^2 +... | 5 | [
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Limit Point Question
March 14th 2008, 05:24 AM #1
Limit Point Question
Suppose a series $z_n \to \alpha$ as $n \to \infty$.
(That is to say $( z_n )$ has a limit point $\alpha$ at infinity.)
Prove that
$\lim_{n \to \infty} \frac{z_1 + z_2 + ~...~ + z_n}{n} = \alpha$
I have found a number of ser... | 5 | [
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0.12... | 14,602 | 14602 | |
How did they get this answer?
September 8th 2010, 03:55 PM #1
Member
Joined
Nov 2009
Posts
87
How did they get this answer?
What is limx->pi/3 [tan(x)]?
Answer: sqrt(3)
Just so it's clear, x is approaching pi/3.
I really want to understand how they got this answer. Any help is appreciated.... | 4 | [
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Is properly divergent series still properly divergent under rearrangement?
February 9th 2011, 01:31 AM #1
Member
Joined
Jul 2009
Posts
120
Is properly divergent series still properly divergent under rearrangement?
For series $\sum\limits_{n = 1}^\infty a_n$, it is said to be properly divergent if its par... | 5 | [
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Matricies, need help...
November 23rd 2010, 07:04 PM #1
Newbie
Joined
Sep 2010
Posts
7
Matricies, need help...
Have tried this a number of times and get different answers everytime. Could someone hold my hand through this because I'm taking functions online and my teacher is no help.
Says to solve t... | 5 | [
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-... | 14,605 | 14605 | |
continuous random variable
November 4th 2010, 06:40 PM #1
Member
Joined
Oct 2007
From
Nevada
Posts
188
continuous random variable
Please let me know of any errors/wrong logic
f(x) = { |x| for -1 < x <=1 , 0 elsewhere
A) Determine Cumulative Distributin Function...
F(x) = { 0 for x < -1... | 4 | [
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Volume of overlapping cones.
June 26th 2012, 11:12 PM #1
Newbie
Joined
Jun 2012
From
Trondheim
Posts
1
I have a problem I hope someone can help me with!
I have two cones. In the beginning they are more than 2r apart from eachother and the volume are just the volume of two cones. But as they are m... | 4 | [
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Help with this Calculus Problem
May 30th 2006, 01:42 PM #1
Newbie
Joined
May 2006
Posts
20
Help with this Calculus Problem
This is a piecewise function
Let f(x) = 2/pi*x when [0,pi/2]
2sinx when (pi/2, 3pi/2]
1 when (3pi/2, 2pi]
a. find a continuous function, F(x), satisfying F(x) = the... | 5 | [
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Riemann-Lebesgue
February 15th 2010, 02:05 PM #1
Riemann-Lebesgue
For this question I have to use the Riemann-Lebesgue Lemma to prove that...
$\lim_{N \rightarrow \infty} \int_{-\pi}^{\pi} \Bigg{(} \frac{1}{\sin(x/2)} - \frac{2}{x} \Bigg{)} \sin((N + 1/2)x) dx = 0$.
With the Riemann-Lebesgue Lemma lemma... | 5 | [
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Break - Math Genius
Answer :
There are, in all, sixteen balls to be broken, or sixteen places in the order of breaking.
Call the four strings A, B, C, and D—order is here of no importance.
The breaking of the balls on A may occupy any 4 out of these 16 places—that is, the combinations of 16 things, taken 4 together, w... | 4 | [
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How to Find what nth-term a Number is in a Sequence
YASuperhero
1. The problem statement, all variables and given/known data
I'm trying to find out the equation for how to find out where a number falls in a sequence.
An example sequence would be 3, 9, 18, 30, 45, 63, 84, 108, 135, 165...
108 is the 8th number in th... | 4 | [
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impossible question for me!!!!!
July 3rd 2009, 02:03 AM #1
Member
Joined
Jun 2009
Posts
77
impossible question for me!!!!!
when (x^4 - 6.x^3 + 16.x^2 - 25. x + 10) is divided by( x^2 - 2.x + k)
the remainder is = x+a
find the values of k and a
There are, I am sure, many subtle ways of solvin... | 5 | [
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On Antiperiodic Boundary Value Problems for Higher-Order Fractional Differential Equations
Abstract and Applied Analysis
Volume 2012 (2012), Article ID 325984, 15 pages
http://dx.doi.org/10.1155/2012/325984
Research Article
On Antiperiodic Boundary Value Problems for Higher-Order Fractional Differential Equations
De... | 5 | [
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Simultaneous equations
February 5th 2011, 10:14 AM #1
Senior Member
Joined
Apr 2006
Posts
290
Simultaneous equations
Am I correct in thinking that the solutions of x and y in these simultaneous equations
y - 3x = 4
x^2 + y^2 = 34
are x = -1.5 and y = -0.5
No if you put them into the 2n... | 4 | [
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Patente US20040158497 - On-line recommender system
FIELD OF THE INVENTION
[0001] This invention relates generally to consumer recommender systems, and more particularly to revising preferences in such systems.
BACKGROUND OF THE INVENTION
[0002] As shown in FIG. 1, consumers use a recommender system 100 to find certa... | 4 | [
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... | 14,615 | 14615 | |
Math Help
September 3rd 2007, 11:15 AM #1
Junior Member
Joined
Feb 2007
Posts
32
orthogonal
Show that intergrate from 0 to Pi Sinmx Sinnx dx = 0 if m doesnt = n (use trig identities)
I know that the trig identity that I need to know is SinaSinb= 1/2[Cos(a-b)-Cos(a+b)] other then that I am lost and ... | 5 | [
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Minkowski spacetime interval's Lorentz invariance
I would do it this way. Take two events (t1,x1,y1,z1) and (t2,x2,y2,z2)
Using the lorentz transformations you can show that:
[tex]\Delta t' = \gamma (\Delta t - v\Delta x/c^2) [/tex]
[tex]\Delta x' = \gamma (\Delta x - v\Delta t)[/tex]
[tex]\Delta y' = \Delta y[/tex]
[... | 5 | [
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Vector Calculus
March 22nd 2011, 06:01 AM #1
Junior Member
Joined
Mar 2011
Posts
68
I am told that f(z) = -iz (i is the complex number) and i need to calculate the vector field: lets call it n
n = ui - vj [i and j here are the unit vectors]
Where u and v are functions of x and y.
Im not ent... | 5 | [
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Index of 2 is equivalent to normal
November 26th 2007, 07:46 PM #1
Newbie
Joined
Oct 2007
Posts
14
Index of 2 is equivalent to normal
Hello,
I have a homework problem which asks:
Let G be a group and let H be a subgroup of G.
(a) Show that if H is index 2 in G then H is a normal subgroup of ... | 4 | [
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Differentiation problem
Forgot to say one thing more --- this time I want a reply from you (xpi0t0s) about who is right ....
... I know you would try to find out who actually is.
I'll take that as a Yes, i.e. you agree so far.
Two questions follow from that.
(1) Do you agree that for all x, f'(x)=5?
(2) Do you agree... | 4 | [
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Analysis of wave propagation in a two-dimensional photonic crystal with negative index of refraction: plane wave decomposition of the Bloch modes
« journal navigation
Analysis of wave propagation in a two-dimensional photonic crystal with negative index of refraction: plane wave decomposition of the Bloch modes
Optic... | 4 | [
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Brevet US7809170 - Method and apparatus for choosing and evaluating sample size for biometric training process
FIELD
The invention relates to training biometric authentication systems. More specifically, the invention relates to selecting an adequate number of training samples to achieve a desired level of
authenticat... | 5 | [
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Proof attempt of fundamental theorem of algebra
September 1st 2013, 12:00 PM #1
Member
Joined
Sep 2012
From
Planet Earth
Posts
195
Thanks
49
Proof attempt of fundamental theorem of algebra
I've been working on an elementary proof of the fundamental theorem of algebra, which doesn't even require c... | 4 | [
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Algebra problem->Check if right,pls
September 22nd 2008, 12:35 AM #1
Junior Member
Joined
Jul 2008
Posts
37
I'm having a hard time learning how to translate a written math problem into algebra equations. Tell me if this is right?
The difference of two number, x and y, is 28. The number y is 8/9 of th... | 4 | [
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Proof of recurrence relation of partitions
1. The problem statement, all variables and given/known data
Let T[itex]_{n}[/itex] denote the number of different partitions of {1,2,...,n}. Thus, T[itex]_{1}[/itex] = 1 (the only partition being {1}) and T[itex]_{2}[/itex] = 2 (the only partitions being
{1,2} and {1},{2}). s... | 5 | [
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Simple problem: Gain after n trials given success rate and profibility
If I win first I end up with 1100, then I lose I end up with 990.
Of if I lose first I end up with 900 and then if I win I end up with 990. (same result)
But if I put these values into the formula I end up with a value of 1000.
Which formula? Als... | 4 | [
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Moment of inertia of a cone
Hi bowma166,
bowma166
1. The problem statement, all variables and given/known data
A cone of mass M has a height h and a base diameter R. Find its moment of inertia about its axis of symmetry
2. Relevant equations
[tex]I=\int R^{2}dm[/tex]
3. The attempt at a solution
I tried startin... | 5 | [
0.0177001953125,
0.01324462890625,
0.04345703125,
-0.0179443359375,
0.0400390625,
-0.0810546875,
0.028076171875,
0.11083984375,
-0.035888671875,
0.036865234375,
0.033447265625,
0.0390625,
-0.007232666015625,
0.045166015625,
0.022216796875,
0.034912109375,
-0.0390625,
0.033935546875... | 14,627 | 14627 | |
Math Help
October 22nd 2007, 04:59 AM #1
Newbie
Joined
Sep 2007
Posts
18
intergration
antidifferentiation of
(x^3)/squareroot((3x^4)+5) dx
i know the formula 1/square root(1 - x^2) but that doesnt help me.
can some one please check this one for me
antidifferentiation
sin^2xcos^... | 5 | [
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0.0155029296875,
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0.026611328125,
-0.00... | 14,628 | 14628 | |
Patent US20060095226 - Hand/eye calibration method using projective invariant shape descriptor of 2-dimensional image
BACKGROUND OF THE INVENTION
This application claims priority from Korean Patent Application No. 2002-72695, filed on 21 Nov. 2002, in the Korean Intellectual Property Office, the disclosure of which is... | 4 | [
-0.06591796875,
0.017822265625,
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0.0... | 14,629 | 14629 | |
Plain & Reinforced Concrete Theory
Concrete
• Concrete is a mixture of cement, fine and coarse aggregate.
• Concrete mainly consists of a binding material and filler material. If filler material size is < 5mm it is fine aggregate and > 5mm is coarse aggregate.
Plain Cement Concrete (PCC)
• Mixture of cement ,... | 4 | [
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0.03... | 14,630 | 14630 | |
How do you work out this equation please?
September 23rd 2012, 10:57 AM #1
Newbie
Joined
Sep 2012
From
Uk
Posts
5
How do you work out this equation please?
I've recently started teaching myself algebra for a work related course and whilst working through some practice papers online I came across the ... | 4 | [
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How to find type of conic section from its general equation?
truongson243
Given the general equation of conic section:
Ax^2+Bxy+Cy^2+Dx+Ey+F=0
How can we find the type of conic section from the above equation?
I've used method of rotating coodinate around the origin (from Oxy to Ox'y', Ox' makes an angle θ to Ox, co... | 4 | [
-0.048583984375,
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integral using substitution
I'm not sure what I did wrong here..
$\int 60x \sqrt {1+x} dx$
$u= \sqrt {1+x}$
$x= u^2-1$
$dx= 2u du$
Then I got
$60 \int (u^3-u) 2u du$
After I integrated I got
$120 (\frac {1} {5} u^5- \frac {1} {3} u^3)$
which isn't one of the answer choices...... | 4 | [
0.060302734375,
0.0186767578125,
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... | 14,633 | 14633 | |
Solving dielectric and plasmonic waveguide dispersion relations on a
« journal navigation
Solving dielectric and plasmonic waveguide dispersion relations on a pocket calculator
Optics Express, Vol. 17, Issue 26, pp. 24112-24129 (2009)
http://dx.doi.org/10.1364/OE.17.024112
Abstract
We present a robust iterative tec... | 5 | [
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... | 14,634 | 14634 | |
Summary: Computational Statistics and Statistical Modelling:
Mathematical Tripos, Part IIA, questions from 1997 onwards
P.M.E.Altham, Statistical Laboratory, University of Cambridge.
July 5, 2005
I/12M
i) Assume that the ndimensional observation vector Y may be written
Y = X# + #,
where X is a given n × p matrix of ra... | 4 | [
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[SOLVED] Polynomial Problem
March 26th 2009, 05:34 PM #1
Newbie
Joined
Mar 2009
Posts
13
[SOLVED] Polynomial Problem
Consider two distinct polynomials of degree N:
A(X) = a0 + a1*X + a2*X^2 + … + aN*X^N
B(X) = b0 + b1*X + b2*X^2 + … + bN*X^N
where ak and bk are real numbers. Suppose tha... | 4 | [
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0.0108642578125,
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Best Fit Quadratic Curve
Date: 02/21/2002 at 01:57:27
From: Avin Sinanan
Subject: Best fit Quadratic Curve
Hello,
I would please like to know how, given a scatter plot of X and Y
cordinates, one finds the best-fitting quadratic curve.
Let's say that Y = A*X^2 + B*X + C is the best fit curve.
How does one find A, ... | 5 | [
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-0.028076171875,... | 14,637 | 14637 | |
Find a in terms of b
April 30th 2011, 09:51 AM
Joker37
Find a in terms of b
For $\pi<a<\frac{3\pi}{2}$ with $cos(a) = -sin(b)$ where $0<b<\frac{\pi}{2}$, find $a$ in terms of $b$.
I am terrible at maths so please show any simple easy to understand working out so that I can understand better.
Any help w... | 4 | [
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0.0181884765625,
... | 14,638 | 14638 | |
Separable equations
May 22nd 2010, 11:26 PM #1
Newbie
Joined
Oct 2009
Posts
5
Hi!
I have problem solving this equation
dy/dx = y/2x
The answer should be y^2 = Cx
I cannot understand why you multiply the constant with x...
$\frac{1}{y} \, dy = \frac{1}{2} \int \frac{1}{x} \, dx$.
... | 5 | [
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-0.042724609375,... | 14,639 | 14639 | |
Robust PID Steering Control in Parameter Space for Highly Automated Driving
International Journal of Vehicular Technology
Volume 2014 (2014), Article ID 259465, 8 pages
http://dx.doi.org/10.1155/2014/259465
Research Article
Robust PID Steering Control in Parameter Space for Highly Automated Driving
^1Department of M... | 4 | [
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0.0155639648437... | 14,640 | 14640 | |
Patent US7885316 - Emission for CDMA communications systems on the MIMO channel
This is a U.S. National Phase Application under 35 USC 371 of International Application PCT/EP2005/004411, filed on 21 Apr. 2005.
GENERAL TECHNICAL FIELD
The present invention relates to the field of digital communications. It concerns ho... | 4 | [
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0.033447265625,... | 14,641 | 14641 | |
Calculating Reflective coefficient for glass slab
Okay, so now I've lost all confidence in myself. I've had a lot of issues calculating the reflective coefficient for a glass slab and a thin film solar cell. I know this method isn't perfect, and not
as good as experimental data (which, if anyone here can supply, I'd be... | 4 | [
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0.00958251953125,
-0.001609802... | 14,642 | 14642 | |
Independent events problem
April 15th 2010, 05:25 PM #1
Newbie
Joined
Apr 2010
Posts
6
Independent events problem
I'm familiar with how to answer a question about independent events when it asks for "at least one" event occurring, but this one has me stumped, I've looked online everywhere:
Cars comi... | 4 | [
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-0.0322265625... | 14,643 | 14643 | |
Patent US7308470 - Smaller and lower power static mux circuitry in generating multiplier partial product signals
Publication number US7308470 B2
Publication type Grant
Application number US 10/728,395
Publication date Dec 11, 2007
Filing date Dec 5, 2003
Priority date Dec 5, 2003
Fee status Paid... | 4 | [
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0.067... | 14,644 | 14644 | |
Output Feedback Control for a Class of Nonlinear Uncertain Systems with Mixed Time Delays
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 197845, 14 pages
http://dx.doi.org/10.1155/2013/197845
Research Article
Robust Fuzzy Output Feedback Control for a Class of Nonlinear Uncertain Systems with Mi... | 4 | [
-0.049560546875,
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0.09326171875,
0.035400390625,
-0.063964... | 14,645 | 14645 | |
MathGroup Archive: August 2006 [00671]
[Date Index] [Thread Index] [Author Index]
RE: General--Difficulties in Understanding Mathematica Syntax
• To: mathgroup at smc.vnet.net
• Subject: [mg68963] RE: [mg68908] General--Difficulties in ... | 5 | [
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-0.0... | 14,646 | 14646 | |
L U factorization, how, why
It might help to understand it a different way, when there is no pivoting. Write the matrix equation out in full for a small example:
$$\begin{bmatrix} a_{11} & a_{12} & a_{13} \\ a_{21} & a_{22} & a_{23} \\ a_{31} & a_{32} & a_{33}\end{bmatrix} =
\begin{bmatrix}1 \\ l_{21} & 1 \\ l_{31} & ... | 4 | [
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Change to polar coordinates
November 7th 2010, 12:50 PM #1
$\displaystyle{ \hdots=\int_0^\infty\int_0^\infty e^{-(u^2+v^2)}du dv }$
We write $u=r\cos(\theta)$ and $v=r\sin(\theta)$ which simplifies $\displaystyle{ e^{-(u^2+v^2)} }$ into $\displaystyle{ e^{-r^2} }$, but why is differential area now $\mathbf{r}... | 5 | [
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-0.015380859375,
0.01635... | 14,648 | 14648 | |
tangent problem
December 26th 2008, 04:23 PM #1
tangent problem
An interesting question.
Find the equation of the tangent for the curve $y = x^2$ at the point $(1,1)$ without using calculus.
you mean without using differentiation, right? well, if so, suppose the line is $y=mx + b.$ since (1,1) belongs t... | 5 | [
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0.125,
-0.0556640625,
-0.057373046875,
0.0... | 14,649 | 14649 | |
Find the inverse of F(x)?
September 8th 2009, 07:27 PM #1
Newbie
Joined
Sep 2009
Posts
1
Find the inverse of F(x)?
f(x) = (2x+3)/(4x-5)
So, I let f(x) = y and then I get y = (2x+3) / (4x-5) and then I figure I solve for x... But I am having difficulty in this, any suggestions? Thank you
Hi Wash... | 4 | [
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0.030029296875... | 14,650 | 14650 | |
search results
Expand all Collapse all Results 1 - 8 of 8
1. CJM 2012 (vol 66 pp. 102)
Continuity of convolution of test functions on Lie groups
For a Lie group $G$, we show that the map $C^\infty_c(G)\times C^\infty_c(G)\to C^\infty_c(G)$, $(\gamma,\eta)\mapsto \gamma*\eta$ taking a pair of test functions t... | 4 | [
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0.038818359375,
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0.00970... | 14,651 | 14651 | |
math induction and DeMorgan's Law
April 17th 2007, 06:42 AM #1
Junior Member
Joined
Mar 2007
From
Missouri
Posts
54
math induction and DeMorgan's Law
Given: Show that for any integer n greater than or equal to 2 given n sets A1,A2,.....An then the complement (A1 U A2 U...An) = complement A1 & complem... | 5 | [
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0.00732421875,
0.0439453125,
0.01300... | 14,652 | 14652 | |
factor theorem
January 5th 2009, 05:18 AM #1
MHF Contributor
Joined
Sep 2008
From
West Malaysia
Posts
1,261
factor theorem
Given that (x-3) and (2x+1) are factors of
$f(x)=ax^4+bx^3+13x^2=30x+9$, find the values of a and b . With these values of a and b , show that $f(x)\geq0$ for all x belongs t... | 4 | [
0.0181884765625,
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0.07763671875,
-0.035888671875,
... | 14,653 | 14653 | |
Math Help
January 24th 2010, 07:55 AM #1
Junior Member
Joined
Jan 2010
Posts
42
sin and cos
When $\frac{\pi}{2}<a<\pi$, $sina=\frac{4}{5}$
$cosa\:=$
not quite sure how to go from sin to cos... not quite sure what to do...
the second part of the question is
$sin2a\:=$
$cos2a\:=$
... | 4 | [
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-0.031494140625,
0.015869140625,
0.057861328125,
-0.033935546875,
0.0025787353515625,
-0.0520019531... | 14,654 | 14654 | |
Required force to rotate the Engine piston
The easier way to do this is to use these formulas:
BMEP (Four-Stroke Piston Engine) in PSI = [(150.8 x Ft-Lbs Torque) / (CID)]
CID = Cubic Inch Displacement of entire piston engine
BMEP (Two-Stroke Piston Engine) in PSI = [(75.4 x Ft-Lbs Torque) / (CID)]
CID = Cubic Inch ... | 4 | [
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Math Help
August 6th 2012, 11:22 AM #1
Newbie
Joined
Aug 2012
From
Amsterdam
Posts
1
LN
I have the following two equations:
(1/2x) * LN (z/(z+3600)=880
and
(1/2x) * LN (z/(z+6400)=1350
How can I resolve x and z from these two equations?
I could do this by iteration, but I pre... | 5 | [
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3 x 3 matrix eigenvectors
Dick
[-za,-2za-bz,z]=z*[-a,-2a-b,1]. Remember eigenvectors are only defined up to an multiplicative constant.
Ok i see that now, but for s = +/-sqrt(2) im finding even harder to do it in this way. It seems very lengthy and im wondering if there is an easier way to do it for this case or ev... | 5 | [
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gee-simulated-annealing
Simulated annealing
The Guile binding to the GNU Scientific Library (distributed with GEE) exposes an interface to the simulated annealing algorithm.
The functions described in this page allow us to solve (approximately) the problem of finding the global minimum of a univariate function f(t) ... | 5 | [
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... | 14,658 | 14658 | |
Math Help
December 4th 2005, 12:27 PM #1
Junior Member
Joined
Oct 2005
Posts
29
tgnts n norms
The equation of a curve is y = 3x^2 - 2x + 1
find the coordinates of the point R on the curve at which the gradient is -14.
do i put the result of dy/dx to equal -14? doing that will not find me 2 poi... | 4 | [
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-0... | 14,659 | 14659 | |
implicit differentiation
March 13th 2010, 09:04 PM #1
Member
Joined
Dec 2009
Posts
224
implicit differentiation
Can anyone show me how to find $\frac{dy}{dx}$ for $(x^2+y^2-1)(y-x^2-1) = 0$ at the points (0,1) and (0,0).
I know that I need to use the process of implicit differentiation but I don't k... | 5 | [
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Binomial Theorem application?
April 23rd 2009, 05:11 AM #1
Binomial Theorem application?
After several operations of differentiation and multiplying by (x + 1) performed in an arbitrary order the polynomial x^8 + x^7 is changed to ax + b. Prove that the difference between the
integers a and b is always divisi... | 5 | [
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0.031494140625... | 14,661 | 14661 | |
Showing A Subset Is A Subspace
January 26th 2011, 05:01 PM #1
Junior Member
Joined
Nov 2008
Posts
53
Showing A Subset Is A Subspace
Which of the following subsets of C^3 (complex) are subspaces:
a) {(a,b,c) in C^3 | c=0}
b) {(a,b,c) in C^3 | |a| is less than or equal to |b|}
c) {(a,b,c) in... | 4 | [
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probability problem independent events
September 1st 2007, 03:38 PM #1
Junior Member
Joined
Aug 2007
Posts
26
probability problem independent events
I have a problem about probability and independent events, could anybody help me to solve this problem?:
a. The Pogo Thorhead rocket will function prope... | 5 | [
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Quantum Field Theory lecture by Tong (Cambridg)
birulami
I am struggling with equation 1.5 in
Tong's QFT course
. I try to understand/explain it in strict calculus, i.e. without physics shortcuts like "small variations". I guess in the full blown explanation, [itex]\delta S[/itex] is a total derivative.
To be spe... | 4 | [
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-0.01434326... | 14,664 | 14664 | |
Matrix determinants (modulo)
May 11th 2010, 01:06 PM #1
Matrix determinants (modulo)
When calculating the inverse of a normal matrix, for $M = \begin{pmatrix}<br /> x & y \\<br /> z & v <br /> \end{pmatrix}$ for example, you would simply use $\frac{1}{xv-yz}\begin{pmatrix}<br />
v & -y \\<br /> -z & x <br /> ... | 5 | [
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0.0172119140625,... | 14,665 | 14665 | |
Patent US5638439 - Adaptive filter and echo canceller
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an adaptive filter and an echo canceller, and particularly relates to updating of tap coefficients thereof.
2. Description of the Prior Art
In recent years, acoustic echo canc... | 4 | [
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Two Generalized Predator-Prey Models for Integrated Pest Management with Stage Structure and Disease in the Prey Population
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 424723, 13 pages
http://dx.doi.org/10.1155/2013/424723
Research Article
Two Generalized Predator-Prey Models for Integrated Pest Mana... | 5 | [
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Solving Diff Eq with initial conditions and first 6 coefficients...
March 18th 2013, 09:27 AM #1
Newbie
Joined
Mar 2013
From
Kansas
Posts
1
Solving Diff Eq with initial conditions and first 6 coefficients...
I need some help here because I am completely lost!!!
I need to solve the ODE (1-x)y''-y... | 5 | [
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-0.0815429687... | 14,668 | 14668 | |
Calculate distance - accleration, time, distance
Okay, gotcha! That's a really awesome idea---I've always wanted to try using the accelerometer data in iPhone apps.
Lets make sure the concepts are clear first, consider a simper situation.
You have a known constant velocity `v' (no acceleration), and you want to find ... | 4 | [
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0.... | 14,669 | 14669 | |
converting parametric equations into cartesian form
January 25th 2009, 01:43 PM #1
Newbie
Joined
Nov 2008
Posts
11
converting parametric equations into cartesian form
show that x = sin t and y = sin (t + pi/6)
can be written in the form y = ax + b√1-x^2 stating the values of a and b
im really s... | 4 | [
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-0.02307128... | 14,670 | 14670 | |
n-body vector addition
February 24th 2010, 06:51 AM #1
Member
Joined
Sep 2009
Posts
242
Thanks
1
n-body vector addition
Hi,
The Physics Help Forum not working today, at least not from my ISP, so this goes here. It's basically a math deal anyway:
The formula to calculate the force of a point... | 5 | [
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Exponential Contest Problem
November 7th 2008, 04:50 PM #1
Junior Member
Joined
Jul 2008
Posts
74
Exponential Contest Problem
Hello everyone,
Could someone pleae check my solution for the following problem?
Thank you!
---
1. Let $a$ and $b$ be real numbers with $a > 1$ and $b > 0$. If... | 4 | [
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An Economic Argument for a Mathematical Conclusion
27 04 2008
How valuable is an income stream that pays $1000 a year in perpetuity? Naively, one might suspect that since this stream will eventually pay out arbitrarily large amounts of money, it should be worth
infinitely much. But of course, this is clearly not true... | 5 | [
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For three consecutive odd integers, the product of seven a
Author Message
TAGS:
For three consecutive odd integers, the product of seven a [#permalink] 22 Mar 2013, 00:03
... | 4 | [
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Calculte max force that can be applied to a Beam flange?
em07189: Maximum moment on the I cross section occurs underneath the wheels closest to the beam midspan when one axle is 140 mm from the beam midspan; and this moment is My = 1215(2*F1), where My =
moment about the I-beam cross section lateral (strong) axis (N*mm... | 5 | [
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0.06494140625,
0.02587890625... | 14,675 | 14675 | |
Unsteady Analyses of a Control Valve due to Fluid-Structure Coupling
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 174731, 7 pages
http://dx.doi.org/10.1155/2013/174731
Research Article
Unsteady Analyses of a Control Valve due to Fluid-Structure Coupling
^1School of Mechanical Engineering, Shan... | 4 | [
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-0... | 14,676 | 14676 | |
Help with a U substitution problem.
January 5th 2013, 02:39 PM #1
Junior Member
Joined
Jan 2013
From
adelaide
Posts
26
I can't figure out how to do this but Ive been assured its easily doable.
Calculate: (int) 2x(4x+7)^8 dx
So I'm assuming we try to get 4x on its own and find 2x in terms of ... | 5 | [
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Using implicit differentiation to find the slope of the tangent line
September 9th 2011, 02:02 PM
Chronoc2005
Using implicit differentiation to find the slope of the tangent line
Stuck on this problem..
http://i55.tinypic.com/xp36gm.png
If it were using explicit differentiation, I could do this, but im... | 5 | [
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-0.02... | 14,678 | 14678 | |
Not a homeomorphism R^n to R^m
another clever way to show the identity map of a 2 - sphere say, is at least not homotopic to a constant by a differentiable homotopy, is to note that the solid angle form has ≠0 integral over the
sphere. It is easy to show by Stokes theorem that two differentiably homotopic maps will pul... | 4 | [
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-... | 14,679 | 14679 | |
Invariant Graphical Method for Electron-Atom Scattering Coupled-Channel Equations
Advances in Physical Chemistry
Volume 2011 (2011), Article ID 541375, 14 pages
http://dx.doi.org/10.1155/2011/541375
Research Article
Invariant Graphical Method for Electron-Atom Scattering Coupled-Channel Equations
^1School of Physics... | 4 | [
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-0.017822265625,
-0.0236... | 14,680 | 14680 | |
Trig application problems.
May 26th 2010, 10:14 PM #1
Junior Member
Joined
May 2010
Posts
36
Trig application problems.
Hi,
I`m having a lot of trouble solving the following question:
The water at a local beach has an average depth of 1 metre at low tide. The average depth of the water at high ... | 4 | [
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... | 14,681 | 14681 | |
Eigenvectors
January 6th 2009, 11:43 AM #1
Junior Member
Joined
Nov 2008
Posts
68
Eigenvectors
Hi, I'm having trouble finding the right values...
Consider the following system I have:
2x - y + z = x
0x + 2y +0z = y
x + 3y +2z = z
So we see from our second equation that 2y=y, thus y... | 5 | [
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0.0027923583984375,
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-0.... | 14,682 | 14682 | |
Exponent Multiplication and Division (again)
June 11th 2009, 07:27 AM #1
Member
Joined
May 2008
Posts
143
Exponent Multiplication and Division (again)
For the following expression I am having difficulty understanding why one cannot proceed with the rule $a^na^m=a^{n+m}$ with a -9 from $(3xy^4)^{-2}$, ins... | 4 | [
0.0185546875,
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0.0142822265625,
0.035888671875,
0.126953125,
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0.08544921875,
0.006317138671875,
0.1337890625,
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0.0578613... | 14,683 | 14683 | |
Statistics Primer
(To help in understanding statistics found in readings—does not include the rules for reporting, etc. Some information has been drawn from Williams, F., (1986). Reasoning with statistics, 3^rd ed.
New York: Hol... | 4 | [
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0.0169677734375,
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Patent US4583078 - Serial Viterbi decoder
BACKGROUND OF THE INVENTION
The invention relates generally to encoding of digital data. In particular, the invention relates to a Viterbi convolutional decoder.
The transmission of digital data, particularly for large amounts of data over long distances, must contend with a ... | 4 | [
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0.09912... | 14,685 | 14685 | |
Equation - Changing the subject
May 14th 2011, 08:51 PM #1
Newbie
Joined
Apr 2011
Posts
8
Equation - Changing the subject
Hi,
I'm working through a game graphics book (and I've been learning the math from scratch) and every now and again the author shoves in a bunch of equations and simplifies them,... | 4 | [
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Using seperation of variables?
April 19th 2010, 10:18 AM
punkstart
Using seperation of variables?
What is the procedure or what are the steps to be carried out here:
$\frac{X\prime}{X}=\frac{1}{4}(\frac{Y}{Y\prime})=\ lambda$
The answer is given as $X=e^{\lambda\alpha}$ and $Y=e^{\frac{\beta}{4\lambda}}$... | 5 | [
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0... | 14,687 | 14687 | |
Please Check: Itergrate by Substitution
Q. Use as substitution to find:
{Intergration symbol} sin(3 + 2x) . dx
if U = 2x + 3 then du = 2. dx
= 1/2 {Intergration symbol} sin (U) . du
= - cos (U) / 2 + c
= - 1/2 . cos (2x + 3) + c
Not sure the method is correct?
| 5 | [
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Quiz Correction For Extra Credit
October 12th 2006, 04:44 PM #1
MarkJames
Guest
Quiz Correction For Extra Credit
My teacher has been hadning back someof our quizes from the previous semester, and i have totally forgotten how to do some of these problems.
If anyone could help me out, i would deeply appreciate... | 4 | [
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plz help area between curves
1>find the area bounded by the graph of y=x and y=x^3.Providesketch of the region on axis
Hello, Gracy, you have the graphs of 2 functions: $l(x)=x$ and $f(x)=x^3$ The enclosed area is calculated by the difference of these two functions: $u(x)=l(x)-f(x)=x-x^3$ Calculate the zeros of u.
The... | 4 | [
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Integral, paralelogram
Find curve integral: $\int\limits_{\Gamma}(\tan x+2y)dx+(3x+4\tan^5y)dy$ where $\Gamma$ is a paralelogram with vertices at (0,0), (1,2), (1,3), (0,1) solved
Last edited by zeh; May 17th 2011 at 05:07 AM.
I'm glad you were able to solve it. For future reference, few people are going to help you ... | 4 | [
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-0.05126953125... | 14,691 | 14691 | |
Physics Forums - How can Simple Harmonic Motion have angular frequency?
InvalidID Feb12-13 09:45 AM
How can Simple Harmonic Motion have angular frequency?
It isn't making any intuitive sense. If it isn't moving in circular motion, how can it have angular frequency or speed?
Also,
[tex]v=\pm ω\sqrt { A^{ 2 }-x^... | 4 | [
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Analysis of Filtering Methods for Satellite Autonomous Orbit Determination Using Celestial and Geomagnetic Measurement
Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 267875, 16 pages
http://dx.doi.org/10.1155/2012/267875
Research Article
Analysis of Filtering Methods for Satellite Autonomous Orbi... | 4 | [
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Piecewise Algebraic Hypersurfaces
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 690341, 7 pages
http://dx.doi.org/10.1155/2013/690341
Research Article
The Viro Method for Construction of Piecewise Algebraic Hypersurfaces
^1Department of Information and Computing Science, Zhejiang Gongshang University... | 4 | [
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A Rotation of Admixable Operators on Abstract Wiener Space with Applications
Journal of Function Spaces and Applications
Volume 2013 (2013), Article ID 671909, 12 pages
http://dx.doi.org/10.1155/2013/671909
Research Article
A Rotation of Admixable Operators on Abstract Wiener Space with Applications
Department of Ma... | 4 | [
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pythagoras
May 28th 2008, 04:51 AM #1
Newbie
Joined
May 2008
Posts
3
pythagoras
the lengths, in centimetres, of the sides of a right-angled triangle are:
x, x+2 and x+5
i) use pythagoras' theorem to write down an equation in x. show that it simplifies to
x^2-6x-21=0
ii) solve the equatio... | 4 | [
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-0.002... | 14,696 | 14696 | |
Differential equation - integrating factor
June 18th 2009, 01:59 PM #1
Junior Member
Joined
May 2009
Posts
51
Differential equation - integrating factor
hello ! i need help bringing this equation into the form $\frac {y} {dy} = ....$
the equation is:
$\frac {dy} {dx} = \frac {y} {x-1} + x(x-1)$... | 5 | [
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Setting up and solving equations involving percentages
July 2nd 2009, 09:31 PM #17
Super Member
July 2nd 2009, 09:30 PM #16
Senior Member
01
No, you already found the amount of each investment, $9,600 and $12,400. When you were asking about multiplying by 0.07 & 0.02, I thought you were checking your work.
Mu... | 4 | [
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... | 14,698 | 14698 | |
A more elegant solution for proving these trig. identities?
May 3rd 2009, 07:55 AM #1
Newbie
Joined
May 2009
Posts
23
A more elegant solution for proving these trig. identities?
Hi there. I just learnt trigonometry today, and the teacher didn't really delve much into the topic yet, just the basic identit... | 4 | [
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