content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Simplify This Fraction
October 15th 2012, 01:52 AM #1
Junior Member
Joined
Oct 2012
From
Australia
Posts
26
Simplify This Fraction
2a/9*6/a^2 = 4/3a. I've played around with the figures but could never derive the answer in bold. How is it done?
Thanks guys.
Re: Simplify This Fraction
Begin... | 4 | [
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0.... | 19,100 | 19100 | |
Flux/parameterizing a cone
LCKurtz
How do you get z = -(3/4)r?? Your equation is
[tex]x^2 + y^2 = (1-z)^4[/tex]
which is the same as r^2 = (1-z)^4. Solve it for z.
Thank you for your reply.
But I don't see how substituting in x=rcos[tex]\theta[/tex], y=rcos[tex]\theta[/tex] will help. I tried rearranging my orig... | 5 | [
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Problem Set
Waves, Sound and Light: Sound and Music
Sound and Music: Problem Set
Problem 1:
The speed (v) at which sound travels through air is dependent upon the temperature of the air and seems to follow the equation v = 331 m/s + 0.6 m/s/°C * T where T is the Celsius temperature of the
air. Determine the speed of... | 4 | [
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find values for x
November 14th 2009, 07:27 PM #1
Junior Member
Joined
Oct 2009
Posts
72
Hi, I have a problem that trying to solve all evning and it is in two parts (a) If $a$ is a positive constant, find the set of valus of $x$for which $a(x^2 +2x-8)$ is negative. Find the value of
a if this function... | 4 | [
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Surface integral z^2=2xy
Apostol page 429, problem 4
Is there a better way to set up this problem or have I made a mistake along the way?
(ie easier to integrate by different parameterization)
1. The problem statement, all variables and given/known data
Find the surface area of the surface [tex]z^2=2xy[/tex] lying ab... | 4 | [
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The Fibonacci sequence
From HaskellWiki
Implementing the fibonacci sequence is considered the "Hello, world!" of Haskell programming. This page collects Haskell implementations of the sequence.
1 Naive solution
fib 0 = 0
fib 1 = 1
fib n = fib (n-1) + fib (n-2)
2 Canonical zipWith implementation
fib = 1 : 1 : zipW... | 4 | [
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... | 19,105 | 19105 | |
Surface integral solved directly and using Gauss' Theorem.
July 18th 2010, 02:16 PM #1
Newbie
Joined
Jul 2010
Posts
3
Surface integral solved directly and using Gauss' Theorem.
To find the flow of the field $F\left( {x,y,z} \right) = \left( {x^3 ,y^3 ,z^3 } \right)$
across the surface of the cone $x^... | 4 | [
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Items tagged with equation
As many of you know now the MRB constant = sum((-1)^n*(n^(1/n)-1),n=1..infinity).
Here are some equations involving various forms of that summation.
The first one involves convergent series and is too obvious. The others involve divergent series.
The last two, however, are new!
Let c=MRB ... | 4 | [
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Patente US6321606 - Apparatus for calculating torque generated by induction motor
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to an apparatus for calculating torque generated by an induction motor (hereinafter referred to as an “induction machine”) driven by a PWM inverter.
Acc... | 4 | [
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-0.0... | 19,108 | 19108 | |
3 Questions that have wracked my brain for two weeks
A "little blurb"? I don't know- I'm not good at "blurbing"!
1.) When you life a bowling ball with a force of 82 N, the ball accelerates upward with an acceleration, a. If you life with a force of 95 N, the balls acceleration is 4 x a. What is the weight of
the ball?... | 4 | [
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Solve for charge(q), given radius, electric field, and density
1. The problem statement, all variables and given/known data
In Millikan's experiment, an oil drop of radius 1.73 μm and density 0.865 g/cm3 is suspended in chamber C when a downward electric field of 1.44 × 105 N/C is applied. Find the charge on the drop,... | 5 | [
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a couple of word problems
December 13th 2006, 07:45 PM #1
a couple of word problems
A circular coffee table has a diameter of 5 ft. What will it cost to have the
top refinished if the company charges $3 per square foot the refinishing?
The distant from Philadelphia to Sea Isle City is 100 mi. A car w... | 4 | [
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Using Integration to evaluate the Bernoulli Polynomials
February 1st 2009, 05:58 PM #1
Newbie
Joined
Feb 2009
Posts
24
Using Integration to evaluate the Bernoulli Polynomials
I'm given the following information:
Bo(x) = 1
& for n greater than or equal to one:
B'n(x) = nBn-1(x)
The inte... | 5 | [
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-0.... | 19,112 | 19112 | |
Boundary value problem - constrained paramter
Deadstar
Let's say I have a set of nonlinear differential equations of the form.
[tex]x' = f(x,y) \\
y' = g(x,y)[/tex]
Where f and g contain some parameter 'a' that is constrained to within certain values.
Let's say I know x(0), y(0) and x(T), y(T) where T isn't a set... | 4 | [
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-0.00288391113281... | 19,113 | 19113 | |
factorising
September 13th 2009, 08:46 AM #1
Member
Joined
Aug 2009
Posts
211
factorising
i've now got the question: factorise: $x^3 - a^3$ but i don't know what to do when its only letters involved without the help of any numbers, could someone show me how to do it this way?
thanks
This is a s... | 4 | [
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... | 19,114 | 19114 | |
confused about delta epsilon proofs
January 1st 2010, 03:05 PM #1
Member
Joined
Aug 2008
Posts
249
confused about delta epsilon proofs
i know how to do basic proofs, but some proofs on the actual limit theorems confuse me. my textbook's choices for delta are very obscure and i have no idea how they even ... | 5 | [
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... | 19,115 | 19115 | |
average value word problem
January 12th 2010, 10:50 PM #1
Member
Joined
Aug 2008
Posts
249
average value word problem
Water is run at a constant rate of 1 ft^3/min to fill a cylindrical tank of radius 3ft and height 5ft. Assuming that the tank is initially empty, make a conjecture about the average weigh... | 5 | [
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The number of Americans...
October 13th 2009, 01:07 PM #1
Member
Joined
Oct 2009
Posts
92
The number of Americans,in thousands who are expected to be over 100years old is approximated by n(t)=0.4018t^2+2.039t+50.71,where t is the year with t=0 corresponding to 1994.Determine the year
that the number o... | 5 | [
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Find the general solution of 4cosec (2x + 1) = 9
Find the general solution of the following trigonometric equation: 4cosec (2x + 1) = 9
Hello, Kiwigirl! Quote: Find the general solution of: $4\csc(2x + 1) \;= \;9$ Divide by 4: . $\csc(2x + 1) \;= \;\frac{9}{4}$ Take reciprocals: . $\sin(2x + 1) \;= \;\frac{4}{9}$ The... | 4 | [
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M/M/1 Arrival and Departure Time Occupancy Distributions 2.2 2002/08/09 2002/11/11 Bart Sinclair bs@rice.edu Charlet Reedstrom charlet@rice.edu Bart Sinclair bs@rice.edu (Blank Abstract) The
continuous-time chain for the M/M/1 queue has the following state transition graph.
The state probabilities are given by π k ρ k... | 4 | [
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-0.0732421... | 19,119 | 19119 | |
Patente US5010573 - Cryptographic system by blocs of binery data
This invention is relative to a cryptographic system which allows the conversion of a vector of n bits into an encrypted vector of n bits under the control of a crytographic key, k, formed by a
vector, also of n bits, n being a whole number, preferably a ... | 4 | [
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0.044921875,
0.0... | 19,120 | 19120 | |
Patent US6078215 - Impedance altering apparatus
BACKGROUND
1. Technical Field
The present disclosure relates generally to impedance altering circuits, and more particularly relates to circuits and methods for increasing the impedance of a circuit by balancing the current flow
into and out of the circuit.
2. Descript... | 4 | [
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Lagrangian Points
However, by Newton's 3rd Law
F[1][2] = –F[2][1].
F[1][3] = –F[3][1].
... | 4 | [
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Find the interval in which the function concave up??
May 3rd 2009, 02:16 PM
change_for_better
Find the interval in which the function concave up??
The graph of the function http://www7.0zz0.com/2009/05/03/22/585474959.jpg
is concave up on the interval:
(-infinity,infinity)
None
(1,infinity)
... | 5 | [
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Faraday's law and gauss's law for magnetism apparent contradiction
There is, of course no contradiction, because a closed surface has no boundary, and thus for a closed surface [itex]A[/itex], you have
[tex]\int_A \mathrm{d}^2 \vec{F} \cdot \vec{B}=0.[/tex]
On the other hand there is Faraday's Law that reads for any s... | 4 | [
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Patente US6659101 - Determination of leak and respiratory airflow
This application is a continuation of application Ser. No. 09/525,042 filed Mar. 14, 2000, now U.S. Pat. No. 6,279,569, which is a continuation of application Ser. No. 08/911,513 filed Aug. 14, 1997,
now U.S. Pat. No. 6,152,129.
FIELD OF THE INVENTION
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0.093... | 19,125 | 19125 | |
Percentage Change
November 8th 2007, 10:38 AM
stuwy
Percentage Change
Q: P=I^2R
If the percentage error in I is 0.75% and R is 0.25%
What is the maximum Percentage change in P?
Could anyone please help me out in this one?
November 8th 2007, 01:21 PM
TKHunny
P = I^2 R
Are we to assume t... | 5 | [
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... | 19,126 | 19126 | |
General solution to a trig equation by turning it into a polynomial equation
May 18th 2009, 12:31 PM #1
Member
Joined
Sep 2008
Posts
239
General solution to a trig equation by turning it into a polynomial equation
by putting $t = tan\frac{\theta}{2}$, find the general solution of the equation
$3cos\... | 4 | [
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0.08... | 19,127 | 19127 | |
[SOLVED] Easy trignoometry question
January 30th 2009, 01:50 PM #1
Member
Joined
Nov 2008
Posts
184
I am reviewing trigonometry and this question has puzzled me.
isosceles triangle $PQR$ has a base of $QR$ 10cm long. The height is 4cm. Determine the measures if the three angles the given triangle.
... | 4 | [
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0.0... | 19,128 | 19128 | |
MathGroup Archive: March 2005 [00760]
[Date Index] [Thread Index] [Author Index]
Re: Recursion question
• To: mathgroup at smc.vnet.net
• Subject: [mg55513] Re: Recursion question
• From: dh <dh at metrohm.ch>
• Date: Sun, 27 Mar 20... | 5 | [
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The integration of e^(x^2)
flouran
I was wondering if it would in fact be possible to express the integral of e^(x^2) in terms of elementary functions. Couldn't I just use a bilateral Laplace transform on e^(x^2) and convert it into
the s domain. Then, I would integrate with respect to s (since switching functions f... | 5 | [
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-0.... | 19,130 | 19130 | |
Physics Forums - View Single Post - Gravity inside the Earth
Fizzicist
This is only true if you assume that the density of the earth is uniform, which is not the case.
that is very true, it would not be uniform. It should still derease to zero as you get to the centre though, as at the COG it cancels out in every ... | 4 | [
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Modelling and Problem Solving Question
May 22nd 2010, 08:42 PM
LawfulSarcastic
Modelling and Problem Solving Question
Hello,
I've been trying to solve this problem for a while, and it's really getting to me. We're supposed to use Microsoft Excel, but I don't know where to start with the problem. It is as fol... | 5 | [
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conical glass
July 28th 2009, 12:45 AM #1
conical glass
A conical glass of depth h and generating angle A, there is carefully dropped spherical iron ball of such size as to cause the greatest overflow.
Show that the radius of the sphere is equal to (h sin A)/(sin A + cos 2A).
Let $x$ denote the heig... | 5 | [
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0.03... | 19,133 | 19133 | |
Heavy duty MLE
March 17th 2010, 04:35 PM #1
I will be impressed if someone can get this. I will also be impressed if someone can explain why this problem is of great interest.
Two correlated random variables $x_i$ and $y_i$ are Bivariate normal
$\left[ \begin{array}{ccc} x_i \\ y_i\\ \end{array} \right]$... | 4 | [
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[SOLVED] Help to solve x and find population
March 3rd 2009, 11:19 AM #1
Member
Joined
Jan 2009
From
USA
Posts
123
[SOLVED] Help to solve x and find population
Okay my boyfriend and I worked on these two problems last night and couldn't figure it out.
Problem 1:
Solve for
which I go... | 5 | [
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Maximizing the Mean Exit Time of a Brownian Motion from an Interval
International Journal of Stochastic Analysis
Volume 2011 (2011), Article ID 296259, 5 pages
http://dx.doi.org/10.1155/2011/296259
Research Article
Maximizing the Mean Exit Time of a Brownian Motion from an Interval
Département de Mathématiques et de... | 5 | [
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0.0625,
-0.063964843... | 19,136 | 19136 | |
Numerical Simulations for the Space-Time Variable Order Nonlinear Fractional Wave Equation
Journal of Applied Mathematics
Volume 2013 (2013), Article ID 586870, 7 pages
http://dx.doi.org/10.1155/2013/586870
Research Article
Numerical Simulations for the Space-Time Variable Order Nonlinear Fractional Wave Equation
^1... | 5 | [
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A Guide to Advanced Linear Algebra
The word “advanced” in the title of this book can be interpreted in two ways. On the one hand, the book discusses topics in linear algebra (canonical forms, bilinear and sesquilinear forms, matrix
Lie groups, etc.) that are rarely taught in an introductory course. On the other hand, e... | 4 | [
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Patent US20050047325 - Combined inverse fast fourier transform and guard interval processing for efficient implementation of OFDM based systems
FIELD OF INVENTION
The present invention relates generally to Inverse Fast Fourier Transform and Guard Interval processing in Orthogonal Frequency Division Multiplexing based ... | 4 | [
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Algebraic number theory.
May 9th 2009, 11:04 AM
peteryellow
Algebraic number theory.
Let I be an ideal generated by $2$ and $1+\sqrt{-3}$ in the ring $\mathbb Z[{\sqrt{-3}}].$
Show that $I$ is different $(2).$
And $I^2 =2I.$
Show that ideals in $\mathbb Z[{\sqrt{-3}}].$ do not factor uniquely into pr... | 4 | [
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math question - inclusion exclusion principle
January 27th 2009, 02:42 PM #1
Junior Member
Joined
Nov 2008
Posts
50
math question - inclusion exclusion principle
x1+x2+x3+x4+x5=32
3 of the variable are naturals and even
2 of the variable are naturals and odd
nobody of the variables equals to ... | 4 | [
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-... | 19,141 | 19141 | |
Simultaneous eqution i think
March 9th 2013, 04:41 PM #1
Newbie
Joined
Feb 2013
From
Australia
Posts
5
Simultaneous eqution i think
G'day
here is the question
Bobby and Kym are two hikers. Bobby walks at 3klms/h and kym walks at 4klm/h. bobby is exactly klm due west of kym. they start walking... | 5 | [
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Combinatorial Identity, Pascal's Triangle, Hexagon Identity
April 9th 2013, 02:42 PM #1
Junior Member
Joined
Feb 2013
From
New York
Posts
28
Combinatorial Identity, Pascal's Triangle, Hexagon Identity
Latex is pretty sweet! just learned how to use this, so for this question
Prove the following c... | 4 | [
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Quick question on extremas
January 14th 2009, 06:24 PM #1
Newbie
Joined
Jan 2009
Posts
2
In lectures we did questions like (in the simplest form) f(x,y,z) = x + 2y + z subject to a constraint, eg. x^2 + y^2 + z^2 = 48 Find the critical points, value and determine the max/min
In the exam papers some o... | 4 | [
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Physics Forums - View Single Post - Rotate point on sphere to exactly 'cut sphere in half'
Sorry to butt in here but I'm curious to know whether the following
alternative solution derived from vector algebra is the same as the
elegant solution proposed by Office_Shredder:
Let [tex] \{x,y,z\} [/tex] be an orthonormal ... | 4 | [
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0... | 19,145 | 19145 | |
Indefinite integrals
September 23rd 2009, 03:40 PM #1
Newbie
Joined
Jul 2009
From
Saint Augustine, FL
Posts
4
Indefinite integrals
I'm very confused about this section. Apparently I need to use the substitution rule but I always seem to mess up, especially with fractions. Can anyone help?
Here's... | 4 | [
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Maximality with respect to inclusion
November 26th 2012, 09:31 AM #1
Member
Joined
Feb 2009
Posts
98
Maximality with respect to inclusion
Let $g(x)=max_{i=1,...,m} f_{i}(x)$ where $f_{i}$ are continuous concave functions and
let $X = \{x: a_{j}^T x \geq b_{j} \}$ ; $M(x) = \{i: f_{i}(x) = g (x) \}$ a... | 4 | [
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0.00360107421875... | 19,147 | 19147 | |
Help setting up two line integrals
July 28th 2012, 07:02 AM #1
Newbie
Joined
Jul 2012
From
Mississippi
Posts
4
Help setting up two line integrals
How do I set up these line integrals?
First problem:
Line integral of y^3dx + x^2dy where C is the arc of the parabola x=1-y^2 from (0,-1) to (0,... | 5 | [
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determinant question 5
November 16th 2010, 12:35 PM #1
MHF Contributor
Joined
Nov 2008
Posts
1,401
determinant question 5
if $\begin{vmatrix}<br /> a & b &c \\ <br /> d & e &f \\ <br /> g&h &k <br /> \end{vmatrix}$=2
then
$\begin{vmatrix}<br /> f & k-4c &2k+f \\ <br /> d & g-4a &2g+d \\ <br /> e... | 4 | [
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Patent US6243497 - Apparatus and method for optimizing the rate control in a coding system
This application claims the benefit of U.S. Provisional Application No. 60/037,056 filed Feb. 12, 1997, which is herein incorporated by reference.
The present invention relates to an apparatus and concomitant method for optimizi... | 4 | [
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0... | 19,150 | 19150 | |
Topological Subgroup
November 8th 2010, 09:36 AM #1
Junior Member
Joined
Oct 2010
Posts
49
Topological Subgroup
If we let H be a subgroup of (X, x, T) where x is the binary operation. Show that
(i)if H is normal, then H* is normal
H* is the closure of H
Of course this is supposed to be a to... | 4 | [
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triangle inequality
January 28th 2009, 07:43 AM
asi123
triangle inequality
Hey guys.
How can I prove the triangle inequality for this norm.
I marked in green what I did but then I got stuck.
Thanks in advance.
January 28th 2009, 10:23 AM
Opalg
This is Minkowski's inequality. You can find proo... | 5 | [
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formula for a sequence
July 4th 2009, 10:24 AM
kkoutsothodoros
formula for a sequence
i am looking for an explicit formula for the sequence given by the following numbers:
0, 1/2, 1, 2/3, 1/3, 0, 1/4, 2/4, 3/4, 1, 4/5, 3/5, 2/5, 1/5, 0, 1/6, etc..
July 5th 2009, 02:50 AM
malaygoel
I could get upto th... | 5 | [
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If a is even, prove a^(-1) is even...
1. The problem statement, all variables and given/known data
If a is even, prove a^-1 is even.
2. Relevant equations
We know that every permutation in [itex]S_n, n>1[/itex] can be written as a product of 2-cycles. Also note that the identity can be expressed as (12)(12) for this... | 4 | [
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The Mostly Logical, Kind Of Long Reason Easter Hops Around On The Calendar
Ever notice how Easter moves around a lot on the calendar? Yeah. So did my boss. While trying to come up with Easter topics to write about, he posed this one. I scoffed. How did people not know it
was because of the equinox? I thought. As it tur... | 4 | [
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0.028564453125,
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Patent US7187769 - Method and apparatus for evaluating the strength of an encryption
TECHNICAL FIELD
The present invention relates to an apparatus and method which are applied, for example, to a cryptographic device to evaluate whether candidate functions satisfy several randomness criteria so as to
obtain functions t... | 4 | [
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0.033203125... | 19,156 | 19156 | |
Moment generating function to deduce limiting distribution
February 1st 2009, 07:16 AM #1
Member
Joined
Feb 2009
Posts
103
Moment generating function to deduce limiting distribution
"Let Y_n be the number of trials up to and including the first success in a sequence of independent trials, where each tria... | 5 | [
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123 written in a random order probability any are in the right place
November 15th 2009, 05:49 PM
renlok
123 written in a random order probability any are in the right place
i have the question if 1,2 & 3 are written in a random order whats the chance one or more of the didgits are in the right place
i know... | 4 | [
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Physics Forums - View Single Post - Finding the sum of a series
steven187
so your sayin that it is possible in some cases to derive a formula for a series besides a geometric series but in most cases its not possible? , and about that series it was suppose to be
[tex]\sum_{n=1}^{\infty}\frac {(-2)^{-n}}{n+1}[/tex]
l... | 5 | [
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Permutation matrix properties proof
April 5th 2011, 02:35 AM
math2011
Permutation matrix properties proof
The problem asks to establish the following properties of $n \times n$ permutation matrices, for all $\sigma, \tau \in \mathcal{S}_n$.
1. $P_\sigma = I$ iff $\sigma(k) = k$ for all $k$, where $I$ denote... | 5 | [
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Is the Black-Scholes equation a differential equation?
In a certain sense it's both. There is a stochastic differential equation which is equivalent to a PDE for the probability density.
Basically, if you have a stochastic differential equation with brownian noise,
e.g.,
$$dX_t = a(X_t,t)dt + b(X_t,t)dB_t,$$
then o... | 4 | [
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Proposition Logics - Seriously need help!
October 30th 2008, 02:39 AM #1
Newbie
Joined
Oct 2008
Posts
15
Proposition Logics - Seriously need help!
Could anyone help me on this problem? i think i did it wrong it looks wierd so i was hoping if someone could show me where i went wrong.
Prove the follow... | 4 | [
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Epsilon Delta Proof of a Limit
September 21st 2009, 05:58 PM
meks08999
Epsilon Delta Proof of a Limit
The problem is give a rigerous epsilon delta proof that lim (x,y) ⟶ (0,0) (x^3 + y^3)/(x^2 + y^2)
Heres what I have. Given any ε > 0, we can find a corresponding δ > 0 such that if 0 < || (x,y) - (0,0)|| < ... | 4 | [
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Rank and Nullity
April 28th 2009, 03:31 PM #1
Senior Member
Joined
Jul 2007
Posts
290
Rank and Nullity
Let T : P3 -> R
T(a0 + a1x + a2x^2 + a3x^3) = a0 - a1 + a2 - a3
Find the Rank and Nullity of T and find a basis for the kernel of T.
For my work :
I set a3 = a0 - a1 + a2
Plugg... | 4 | [
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Probability Questions
September 16th 2009, 05:48 PM
Raji
Probability Questions
Hi,
I have been trying to work this question for two days, but I could not figure it out. If any one help me to direct me that would be much appreciated. please!!!
Suppose X follows a Normal distribution with mean (mu) (with... | 5 | [
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Patent US4645461 - Method for structurally differentiating polynomial functions
TECHNICAL FIELD
The technical field of this invention is methods for performing mathematical differentiation of polynomial functions using parallelogrammic structural elements which are arranged into structural sets
and subsets to indicate... | 4 | [
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arithmetic sequence problem
February 26th 2009, 03:39 PM #1
Member
Joined
Aug 2008
Posts
249
arithmetic sequence problem
sry it's me with another question again. my test is coming up and my teacher is giving us all these challenge problems to prepare.
The sum of the first n terms in a certian arithm... | 4 | [
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Patent US20020106105 - Embedding data in material
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to embedding data in material.
[0003] “Material” as used herein means information material represented by information signals which includes at least one or more of imag... | 4 | [
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Electromotive Force Problems
Here are my homework problems. I did most of them, but I don't understand how to do the others.
1. A rod of length 0.40 m moves in a magnetic field of magnitude B=1.2 T. The emf induced in the moving rod is found to be 2.40 V.
a)what is the speed of the rod?
b)if the total circuit resistan... | 4 | [
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Limit calculation
May 9th 2011, 08:01 AM #1
Junior Member
Joined
Mar 2011
Posts
34
Limit calculation
I can't seem to get the hang of calculating these indeterminate forms...how do I figure out
limit ln(cosx) / ln(cos5x) as x goes to pi/2 from the left
The left limits of the numerator and denomi... | 5 | [
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P&C qns: Please help me understand
February 20th 2008, 02:12 AM #1
Newbie
Joined
Feb 2008
Posts
2
P&C qns: Please help me understand
1. Three numbers are chosen from 1,2,3,4,5,6,7,8,9. Find the number of arrangements in which the smallest chosen numbers is odd.
Ans (Highlight to find out) : 300
... | 4 | [
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Proving a number is divisible by 48
johnnyICON
Oooh.. so those forms, 6m, 6m+1, etc., are all possible ways of expressing any number in terms of 6?
That is q=6, the uniquely determined integer? But that doesn't mean that n is divisible by 6?
In matt's notation p=6, you're dividing your number k by 6, so it's of the f... | 4 | [
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Patent US5745396 - Pipelined adaptive IIR filter
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to adaptive filtering techniques, and, more particularly, to pipelined adaptive infinite impulse response filters.
2. Description of the Related Art
In digital signal processing and communica... | 4 | [
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Patent US4620436 - Method and apparatus for calibrating transformation matrix of force sensor
BACKGROUND OF THE INVENTION
The present invention relates to detecting method and apparatus of a force sensor for automatically detecting a transformation matrix indicative of the relationship between the strain voltage and t... | 4 | [
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Integrals = no mercy
July 21st 2009, 02:34 PM #1
Integrals = no mercy
5) (i) Use the substitution $u^2=2x+1$ to show that, $x>4$
$\int\frac{3}{(x-4)\sqrt{2x+1}}dx=\ln(\frac{\sqrt{2x+1}-3}{\sqrt{2x+1}+3})+K$
where K is a constant.
(ii) Show that (from ln 8 to ln 3) $\int\frac{2}{e^x\sqrt{e^x+1}}=\fr... | 5 | [
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The Fundamental Theorem of Calculus
November 14th 2008, 02:35 PM
McDiesel
The Fundamental Theorem of Calculus
Ok, I am having a heck of a time trying to solve this one. I know that there is something to do with absolute values but not sure where I would use it. Also, do you need to graph the equation
first o... | 5 | [
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Decibel loss question
December 28th 2009, 04:07 AM #1
Newbie
Joined
Dec 2009
Posts
16
Decibel loss question
If it was possible to have a sound source of 4225 db, i know that at 1m it looses 11dB then every time you double the distance it looses 6db.
IE: 1m = 11, 2m = 17, 4m = 23, 8m = 29 etc etc
... | 5 | [
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Patent US5956418 - Method of mosaicing ultrasonic volumes for visual simulation
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to image processing for medical imaging and, more particularly, to a method for registering images, especially ultrasound images, of a patient, acquired from several
viewp... | 4 | [
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implicit differentiation
February 22nd 2010, 01:35 PM #1
Member
Joined
Feb 2010
Posts
93
implicit differentiation
Hi:
If 8y(x+y)=4x, find an expression for dy/dx
8y(x+y)=4x
u=8y
v=(x+y)
du/dx=8
dv/dx=1
dy/dx=8y.1dy/dx+(x+y).1=9
dy/dx=8ydy/dx+(x+y)=9
I'm not sure ... | 5 | [
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Sequence of numbers
September 27th 2011, 12:58 PM #1
Newbie
Joined
Jul 2011
Posts
15
I have a number theory problem with solution but i dont understand why one can write this equallity (green question mark). Because 1122 is not 11*22 or 111222 is not 111*222.
ImageShack® - Online Photo and Video ... | 4 | [
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... | 19,180 | 19180 | |
trigonometric identity question
July 29th 2009, 07:32 AM #1
Junior Member
Joined
Jul 2009
Posts
25
trigonometric identity question
the questions is to find all possible measures of angle $\theta$ if $0\leq\theta\leq360^o$
$sin\theta= - 1/\sqrt2$
and
$tan\theta = -1$
I know they are bot... | 4 | [
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0.0284423828125,
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Divide a triangle into 2 parts equal area by a line parallel to its base.
A proof or brief explanation why would be nice too! Thank you!!
Re: Divide a triangle into 2 parts equal area by a line parallel to its base.
Hello, Jammix! Quote: Divide a triangle in two equal areas by the line parallel to its base. Code: - ... | 4 | [
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Curve Sketching Tangents, etc Question
May 31st 2007, 06:52 PM
SportfreundeKeaneKent
Curve Sketching Tangents, etc Question
For the first question, I get x=1, -1 for critical points. The interval of increase is -1<x<1. The local extrema are (-1,-1/2) and (1,1/2)
The H.A is y=0 and the curve crosses it at (0,... | 4 | [
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Primitive roots
August 16th 2010, 06:16 AM #1
Member
Joined
May 2008
Posts
140
Primitive roots
Use primitive roots to prove that
1^100 + 2^100 + ... +(p-1)^100 = 0 (mod p)
for all except five primes p. What are these primes?
When 100/(p-1)=t in Z
then:
1^100 + 2^100 + ... +(p-... | 5 | [
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... | 19,184 | 19184 | |
Math Help
November 13th 2011, 12:43 PM #1
Member
Joined
Sep 2011
Posts
106
Thanks
1
indeterminate
Use analytical methods to evaluate the following problem.
$\lim_{x\rightarrow 4} \frac{^5\sqrt{6x+8}-2}{\frac{1}{x}+\frac{1}{4}}$
the answer to the limit is $-\frac{6}{5}$
I have been tak... | 5 | [
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Risk-Averse Suppliers’ Optimal Pricing Strategies in a Two-Stage Supply Chain
Discrete Dynamics in Nature and Society
Volume 2013 (2013), Article ID 937141, 11 pages
http://dx.doi.org/10.1155/2013/937141
Research Article
Risk-Averse Suppliers’ Optimal Pricing Strategies in a Two-Stage Supply Chain
^1College of Econo... | 5 | [
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Consecutive integers
April 22nd 2010, 03:03 AM
Masterthief1324
Consecutive integers
There is a question that asks: Find three consecutive integers such that the sum of their squares is 149?
I chose to represent the consecutive integers as x, x+1, x+2. Another person chose to represent it as x-1, x, x+1. It ... | 4 | [
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... | 19,187 | 19187 | |
How do I "solve by factoring" something with an = sign?
How do I "solve by factoring" something with an = sign? Like this: $3x^2+5x=2$ ?
$3x^2 + 5x = 2$ $3x^2 + 5x - 2 = 0$ This is something called the "ac method." Multiply the coefficient of the $x^2$ term by the constant term: $3 \cdot (-2) = -6$ Now write out all ... | 4 | [
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Gibbs free energy doesn't increase (constant T and P) - proof doesn't seem right
Silversonic
First my notes discover that for an isothermal transformation;
ΔW ≥ ΔF
Where W is the work done and F is the Helmholtz Free Energy, F = E - TS.
Then it defines the Gibbs free Energy;
G = F + PV
"For a system at constan... | 4 | [
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Differentiating x^x
power freak
Instead of starting a new thread I thought I'd "borrow" this one:
I am trying to differentiate the function [tex]y=(x^x)^x[/tex]
Would this working be correct?
[tex]y = (x^x)^x = x^f^(^x^) [/tex]
Nope, this line is wrong. Instead, it should read:
[tex]y = {(x ^ x)} ^ x = f(x) ^ x[/... | 5 | [
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... | 19,190 | 19190 | |
Initial value problem
December 7th 2009, 07:23 AM #1
Junior Member
Joined
Dec 2009
Posts
28
Hello all,
Can you see if this makes sense please.
$\frac{dy}{dx} = \frac{e^{-4x} - x}{e^{-4x} + 2x^{2} + 1} when y(0)=4$
$\int \frac{f'(x)}{f(x)}=ln(f(x))+c$
$-\frac{1}{4} \int \frac{4e^{-4x} +... | 5 | [
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Rational Equations
March 4th 2007, 02:39 PM #16
first of all, you can only have one x, so i replaced the second x with c, meaning a constant, b is also a constant
x²-bx-c = (x- )(x+ )
x²-bx+c = (x- )(x- )
x²+bx-c = (x+ )(x- )
x²+bx+c = (x+ )(x+ )
Here are the rules:
Multiplying two thin... | 4 | [
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Finding charges in a pendulum in equilibrium
ap123
It would be easier to find r by using a single right-angle triangle.
Then r = 2Lsinθ, (where L is the string length).
Heh heh. I know, but using the sine rule makes me feel fancy. :<
Simon Bridge
what is wrong with drawing a free-body diagram for each mass and ... | 4 | [
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Strong pseudoprime
May 10th 2010, 09:00 AM #1
Strong pseudoprime
Could someone just clear up what exactly a strong pseudoprime is for me? Every book seems to say something slightly different!
From my notes it appears it might be if it passes the Miller-Rabin-Shang pseudoprime test however that doesn't actual... | 5 | [
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Infinite series (3)
Evaluate $f(x)=\sum_{n=1}^{\infty} \frac{x^n}{(1+x)(1+x^2) \cdots (1+x^n)}, \ \ 1 \leq x \in \mathbb{R}.$
$f(x)=\sum_{n=1}^{\infty} \frac{x^n}{(1+x)(1+x^2) \cdots (1+x^n)} = \sum_{n=1}^{\infty} u_{n-1} - u_n = u_0 - \lim_{n \to \infty} u_n = 1$ where $u_n = \frac{1}{(1+x)(1+x^2) \cdots (1+x^n)}$ $\... | 5 | [
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-... | 19,195 | 19195 | |
Finding x-intercepts
November 12th 2012, 12:16 PM #1
Newbie
Joined
Nov 2012
From
united states
Posts
3
Finding x-intercepts
h(x)= 2x^2-5x-4
The back of the books tells me that the answer is (5 - the square root of 57 over 4. ,0) , (5 + the square root of 57 over 4. ,0) but I can't figure out how... | 4 | [
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-0.0786132812... | 19,196 | 19196 | |
Money problems
Can you please help me solve questions 18 and 20 by using substitution or elimination method. http://img230.imageshack.us/img230/4372/mathyv1.jpg Thanks
here are the questions: 1)You are starting a business that sells air filters for homes. Your startup costs for the business are $1250 and each air filt... | 4 | [
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Veterinary Epidemiologic Research: GLM – Evaluating Logistic Regression Models (part 3)
Third part on logistic regression (first here, second here).
Two steps in assessing the fit of the model: first is to determine if the model fits using summary measures of goodness of fit or by assessing the predictive ability of t... | 4 | [
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Find a differential equation given solution
September 20th 2010, 10:41 PM #1
Newbie
Joined
Sep 2010
Posts
7
Find a differential equation given solution
Find a diŽerential equation whose solution is the two parameter fam-
ily of curves ln y = c1*x^2+ c2.
I've gotten this far:
y= e^(c1*x^2+ c... | 5 | [
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