content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Criterion for Unbounded Synchronous Region in Complex Networks
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 513871, 8 pages
http://dx.doi.org/10.1155/2013/513871
Research Article
Criterion for Unbounded Synchronous Region in Complex Networks
School of Mathematics and Statistics, State Key Lab of Soft... | 4 | [
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0.060546875,
-0.05615234... | 30,400 | 30400 | |
Physics Final (cheat sheet) with problems
χ
Vχ Full* 45deg has max. rangeSteps:
1.
υ
o
cos θ
o
/
υ
o
sin θ
o
2.Find the TIME (check Y)3.Find the height / rangeX . Y .
χ = V χ t t = 2 υ
o
.
(Vx =
υ
o
cos θ
o
)
g
(V
o
=
υ
o
sin θ
o
)
y max = υ
o
2
2g
-----------------------------... | 4 | [
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0.0... | 30,401 | 30401 | |
Homework Help
Posted by Marcus on Sunday, March 30, 2008 at 10:59pm.
Please calculate the solubility of calcium sulfate in 0.010 mol/L calcium nitrate at SATP.
This very question has been bugging me all weekend. Can some one please solve this quesiton it would really be appreciated.
• chemistry - DrBob222, Sunday,... | 5 | [
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Grade 12- Advanced Funtions
Posted by Confused on Thursday, October 13, 2011 at 6:09pm.
what about this question:
Determine the roots algebraically by factoring.
a) x^3-8x^2-3x+90=0
• Grade 12- Advanced Funtions - MathMate, Thursday, October 13, 2011 at 9:06pm
x^3-8x^2-3x+90=0
The leading coefficient is... | 4 | [
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Coordinate Geometry
May 2nd 2007, 07:13 AM
classicstrings
Coordinate Geometry
Hello again! I'm in need of some help with these two parts.
Find the value(s) of k for which the equation x + 1 + (1/x) - k = 0, x not equal to 0, has no real solutions.
A second function is defined as g(x) = b/(f(x)), b grea... | 5 | [
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-0.07... | 30,404 | 30404 | |
Math Help
May 26th 2008, 10:13 AM #1
I am working on interest questions and there are a few I cannot figure out.
1) Calculate the present value of each investment, given the final value of the investment.
b) $10 775.64 after 50 years at 8% compounded monthly.
2) John loans $6000 to his sister, Sall... | 4 | [
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... | 30,405 | 30405 | |
Epistemic Uncertainty Analysis: An Approach Using Expert Judgment and Evidential Credibility
International Journal of Quality, Statistics, and Reliability
Volume 2012 (2012), Article ID 617481, 8 pages
http://dx.doi.org/10.1155/2012/617481
Research Article
Epistemic Uncertainty Analysis: An Approach Using Expert Judg... | 5 | [
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-0.003677368164... | 30,406 | 30406 | |
Energy-Aware Adaptive Cooperative FEC Protocol in MIMO Channel for Wireless Sensor Networks
Journal of Electrical and Computer Engineering
Volume 2013 (2013), Article ID 891429, 9 pages
http://dx.doi.org/10.1155/2013/891429
Research Article
Energy-Aware Adaptive Cooperative FEC Protocol in MIMO Channel for Wireless S... | 4 | [
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0.047... | 30,407 | 30407 | |
Subgroup Problem
April 16th 2008, 05:47 AM #1
Junior Member
Joined
Apr 2008
Posts
30
Subgroup Problem
Let G be an abelian group. Let H be the subset of G consisting of the identity e together with all elements of G of order 2. Show that H is a subgroup of G.
I'm not sure how to go about showing clos... | 5 | [
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constructible angle
October 23rd 2007, 02:15 PM #1
Junior Member
Joined
Oct 2007
Posts
32
constructible angle
The measure of a given angle is
180o
n
, where n is a positive integer
not divisible by 3. Prove that this angle can be trisected by Eucliden means
(straightedge a... | 4 | [
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Homework Help
Posted by Sarah on Sunday, May 19, 2013 at 5:51am.
Sarah was given a sum of money. She spent the same amount of money each day. She spent 2/7 of her money in 6 days. After another 5 days, she had $20 left. How much money did she have at first.
• Math - Reiny, Sunday, May 19, 2013 at 8:11am
let th... | 4 | [
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Nuking mosquitoes: Commutative algebra and the Frobenius problem
Posted by: Alan Guo | July 13, 2011
Nuking mosquitoes: Commutative algebra and the Frobenius problem
This is one of those things that convinced me that commutative algebra was cool and actually useful for solving combinatorial problems. The Frobenius pr... | 5 | [
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Matrices and linear maps.
November 23rd 2011, 08:06 AM #1
Newbie
Joined
Nov 2011
Posts
7
Matrices and linear maps.
f: R2 --> R2
X1 --> X1
X2 --> 1/3X2
There's only meant to be 1 arrow between the two matrices.
Prove that f is a linear map using additivity and homogeneity.
Determine... | 5 | [
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two percentage word problems!!! No clue!
March 11th 2008, 09:44 PM
wickedcharchar
two percentage word problems!!! No clue!
1) In the chemistry lab I had to mix some 33and1/3 alcohol with some 12and1/2 alcohol to get a 50 litre jug of 25% alcohol. How many litres of the 33and1/3% and of the 12and1/2% alcohol did ... | 4 | [
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Intermediate Algebra
Posted by ladybug Please Help!! on Monday, June 18, 2012 at 8:51pm.
Solve using elimination method. If the system has no system or infinite number of solutions, state this. Please show all work. I need to show how I came about my answer. I need this as soon as
possible please. I would appreciate a... | 4 | [
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Homework Help
Posted by Kaylie on Thursday, July 5, 2012 at 2:15pm.
A cube with a volume of 216 cm3 is cut down to a pyramid with the same size base and the same height as the original cube. What is the volume of the pyramid?
A.108 cm3
B.94 cm3
C.72 cm3
D.52 cm3
• Math - Chip, Thursday, July 5, 2012 at 2:20pm
... | 4 | [
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metric spaces
May 2nd 2009, 04:39 AM #1
Junior Member
Joined
Mar 2009
Posts
42
metric spaces
Let (X,d) and (Y,p) be metric spaces, and assume Y is complete. Let f: X→Y and x∈X.
Show that f has a limit at x if and only if given any ε>0 there exists δ>0 such that whenever y, z ∈B_δ(x)＼｛x｝,p(f(y),f(z)) ... | 5 | [
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Legendre Symbol (2/p)
March 7th 2010, 07:36 PM #1
Senior Member
Joined
Jan 2009
Posts
404
"Let p be an odd prime, then we proved that the Legendre symbol
Note that this can be easily computed if p is reduced modulo 8.
For example, if p=59, then p≡3 (mod 8) and $(-1)^{(p^2-1)/8}$ = $(-1)^{(3^2-1)... | 5 | [
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Intersection of infinite sets that contain each other
April 25th 2009, 03:13 AM
eddi
Intersection of infinite sets that contain each other
If each A_i is a set containing infinite elements, and A_1 contains A_2 contains A_3 contains ... on and on, then is the intersection of all these sets infinite?
I think... | 4 | [
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the encyclopedic entry of maximum likelihood estimation
Maximum likelihood estimation
(
MLE
) is a popular
statistical
method used for fitting a mathematical model to some data. The modeling of real world data using estimation by maximum likelihood offers a way of tuning the free parameters of the model to provide... | 5 | [
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Homework Help
Posted by Amie on Wednesday, February 29, 2012 at 3:36am.
How should I approach this, what formula do I use to solve and how do I solve it?
How long, to the nearest year, will it take me to become a millionaire if I invest $3000 at 9% interest compounded continuously?
Thanks
• Math - Amie, Wednesday... | 5 | [
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Eccentricity of Lemniscate of Bernoulli
October 6th 2009, 07:13 AM #1
Member
Joined
Sep 2009
Posts
242
Thanks
1
Eccentricity of Lemniscate of Bernoulli
Hi,
For the ellipse and hyperbola there are simple equations for finding the eccentricity.
Does anyone know of an analogous equation for fi... | 4 | [
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arccos(cos4), arctan(tan4)
Is it 4 degrees or 4 radians. If radians: $\text{arccos} (\cos4) eq 4$ because the range of arcos is $0 \leq \text{arcos} x \leq \pi$ ...... 4 radians is in the third quadrant - outside the range of
arcos. So you need the 'equivalent' angle that's in the second quadrant - the second quadant i... | 4 | [
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-0.00074768... | 30,422 | 30422 | |
population model
September 22nd 2013, 05:02 PM #1
Newbie
Joined
Sep 2013
From
thailand
Posts
13
population model
The simplest useful model for fisher comes from the logistic model for population growth, together with a harvest h which is proportional to the current population P, that is,
h=EP,
... | 4 | [
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Raised by an unknown quantity
June 24th 2010, 06:36 PM #1
Hi! Here I'm again!
If $5^{3a} = 64$ , so $5^{-a}$ is?
I've tried change the base, ( $64 = 2^6$), for example... But I coudn't get a result, because I don't know what to do with the $5^3 = 125$ and the $5^a$ , or how to transform they on $2$
... | 4 | [
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0.... | 30,424 | 30424 | |
Unit Key Question - Probability Pizza :)
January 9th 2009, 06:13 PM #1
Junior Member
Joined
Nov 2008
Posts
53
Unit Key Question - Probability Pizza :)
The student council is ordering pizza for their next meeting. There are 20 council members, 7 of whom are vegetarian. A committee of 3 will order 6 pizza... | 4 | [
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Object Shape Recognition Using Wavelet Descriptors
Journal of Engineering
Volume 2013 (2013), Article ID 435628, 15 pages
http://dx.doi.org/10.1155/2013/435628
Research Article
Object Shape Recognition Using Wavelet Descriptors
Faculty of Electrical, Information and Media Engineering, University of Wuppertal, Rainer... | 4 | [
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a question about limits
September 4th 2006, 10:02 PM
mHadad
a begginer's question about limits
doesn't limits define when f(x) becomes undefined(changes it's behavior and becomes dis continuous??) as x approaches a real number a??
i could not understand the following example:
( x ^ 2 + x - 2 ) / ( x - 1... | 4 | [
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0.06640625,
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0.07568359375,
-0.0419921875,
0.0191650390625,
0.0157470703125,
-0.01300048828125,
-0.0179443359375,
-0.0299072265625,
... | 30,427 | 30427 | |
Convergence of fixed point iteration question
April 19th 2010, 01:34 PM #1
Member
Joined
Feb 2009
Posts
98
Convergence of fixed point iteration question
Let p>0 and $x = \sqrt{p+\sqrt{p+\sqrt{p+ \cdots }}}$ , where all the square roots are positive. Design a fixed point iteration $x_{n+1} = F (x_{n})$ wi... | 4 | [
-0.07373046875,
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0.06298828125,
0.03271484375,
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0.000583648681640625,
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0.0147705078125,
... | 30,428 | 30428 | |
Optimal Control Problem: Constrained Optimzation with Fixed Endpoints
January 27th 2014, 07:18 AM #1
Newbie
Joined
Jul 2012
From
the Netherlands
Posts
3
Optimal Control Problem: Constrained Optimzation with Fixed Endpoints
Hi. This is a problem I'm having hard time solving.
The following "autonom... | 5 | [
0.01153564453125,
-0.01318359375,
0.042236328125,
-0.03271484375,
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0.025390625,
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0.07666015625,
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0.003814697265625,
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0.038818359375,
0.07275390625,
-0.00982666015625,
-0.031982421875,
0.037109375,
0.0654296875,
-0.0776367... | 30,429 | 30429 | |
Factoring
February 7th 2013, 03:55 PM
michellederz
Factoring
Pretty sure factoring would be in the algebra department... hoping so. Anyways, can anyone help me factor this equation?
3x^2-10x+3
I can't seem to figure it out. (Tmi)
February 7th 2013, 04:07 PM
jakncoke
Re: Factoring
Try solving fo... | 4 | [
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0.01416015625,
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0.0308837890625,
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0.01092529296875,
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0.... | 30,430 | 30430 | |
Set of two-digit positive integers
August 12th 2011, 09:20 AM
alexmahone
Set of two-digit positive integers
Let H be a ten-element set of two-digit positive integers. Prove that H has two disjoint subsets A and B so that the sum of the elements of A is equal to the sum of elements of B.
August 12th 2011, 10:58 ... | 5 | [
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... | 30,431 | 30431 | |
Lessons In Electric Circuits -- Volume IV
i
Lessons In Electric Circuits -- Volume IV
Chapter 13
DIGITAL-ANALOG CONVERSION
Connecting digital circuitry to sensor devices is simple if the sensor devices are inherently digital themselves. Switches, relays, and encoders are easily interfaced with gate circuits du... | 5 | [
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I don't know what I did wrong on this integral..
Question is: Evaluate $\int_{25}^{36}\frac{ln(y)}{\sqrt(y)}dy$
Integrating by parts,
$u=ln(y), du=\frac{dy}{y}$
$dv=\frac{1}{\sqrt{y}}dy, v = 2\sqrt{y}$
$=[2\sqrt{y}ln(y) - 2\int\frac{1}{\sqrt{y}}dy]_{25}^{36}$
$= [2\sqrt{y}ln(y) - 4\sqrt{y}]_{... | 5 | [
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0.004974... | 30,433 | 30433 | |
second order ODE
November 9th 2008, 07:08 PM #1
Newbie
Joined
Oct 2008
Posts
19
second order ODE
Solving v''t + v' = 0
When I substitute w for v' I get
$\frac{dw}{w}=-\frac{dt}{t}$
$ln(t)=-ln(w)+c$
but this gives me $w=-t/c \rightarrow w=t/c$ rather than $w=c/t$
A seemingly simpl... | 4 | [
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0.031982421875,
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-0.002029... | 30,434 | 30434 | |
find inverse function
October 13th 2009, 07:15 AM #1
Junior Member
Joined
May 2009
Posts
66
find inverse function
$f(x) = 5(x-2)^3 - 6$
Could someone help me find the inverse function for this function?
I understand these steps:
Set f(x) to y
$y = 5(x-2)^3 - 6$
Swap x and y
$x... | 4 | [
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0.049072265625,
0.10595703125,
-0.08447265625,
-0.0349... | 30,435 | 30435 | |
Any ideas around simplifying the following?
December 31st 2012, 06:06 PM
exp13
Any ideas around simplifying the following?
Has left me so very confused:
Un+1= 5^n+1+(-8)^n+1
Un-1= 5^n-1+(-8)^n-1
Un^2 =5^2n+2(5^n(-8)^n)+(-8)^2n
Un+1Un-1 = 5^2n+5^n+1(-8)^n-1+5^n-1(-8)^n+1+(-8)^2n
after cancell... | 4 | [
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Differential equation question
April 19th 2008, 10:58 AM
emttim84
Differential equation question
Here's the instructions:
In Exercises 37-39, use Newton's Law of Cooling, which states that the rate of change in the temperature T of an object is proportional to the difference between the temperature T of the... | 5 | [
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Find gcd
May 4th 2013, 07:34 PM
kayabi5
Find gcd
How to find the gcd of f(x)=x^2 - x-2 and g(x)= x^3-7x+6 in F[3][x]. Expressed as a linear combination of f,g.
May 4th 2013, 08:22 PM
ibdutt
Re: Find gcd
factorize f(x) and g(x) .
the product of common factors will be the gcd.
May 5th 2013, 02:13 AM
... | 4 | [
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0.07... | 30,438 | 30438 | |
Equation of a badminton birdie
January 2nd 2009, 04:14 PM #1
Newbie
Joined
Nov 2008
Posts
8
Equation of a badminton birdie
So the problem goes like this:
In an underhand serve, the birdie starts from a point 2m above the ground and travels a horizontal distance of 20m before it strikes the floor. Th... | 4 | [
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0.04052734375,
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-0.05029296875,... | 30,439 | 30439 | |
[SOLVED] Changing fractions to have their least common denominator equivalent
October 4th 2005, 07:06 AM #1
VHIStudent7
Guest
Ok, I am having a really hard time understanding this. I thought I did but the answer key has a different answer than what I thought it was.
Here's the problem:
change 2m and m+n/... | 4 | [
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Hubble Diagram Test of Expanding and Static Cosmological Models: The Case for a Slowly Expanding Flat Universe
Advances in Astronomy
Volume 2013 (2013), Article ID 917104, 5 pages
http://dx.doi.org/10.1155/2013/917104
Research Article
Hubble Diagram Test of Expanding and Static Cosmological Models: The Case for a Slo... | 4 | [
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0.0230712890625,
0.07568359375,
-0.0751953125,
0.054443359375,
-0.1171875... | 30,441 | 30441 | |
minimum number series /w error problem
January 16th 2007, 10:19 AM #1
Senior Member
Joined
Jan 2007
Posts
477
minimum number series /w error problem
Whats the minimum number of terms of the series
infinity (1) / ((n)Ln^2(n))
E
n = 2
..that must be added to find the sum with error at mos... | 5 | [
0.03466796875,
0.036865234375,
0.025146484375,
0.047607421875,
0.0458984375,
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0.034423828125,
0.010986328125,
-0.00836181640625,
-0.0069580078125,
0.00506591796875,
0.046875,
0.000049114227294921875,
-0.1337890625,
0.005645751953125,
-0.00933837890625... | 30,442 | 30442 | |
Modeling and Simulation of Fiber Orientation in Injection Molding of Polymer Composites
Mathematical Problems in Engineering
Volume 2011 (2011), Article ID 105637, 14 pages
http://dx.doi.org/10.1155/2011/105637
Review Article
Modeling and Simulation of Fiber Orientation in Injection Molding of Polymer Composites
^1D... | 4 | [
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0.0... | 30,443 | 30443 | |
Complex analysis
October 11th 2013, 11:59 AM
nm321
Complex analysis
Let f(z)= z bar. This is an example of a function which is continuous everywhere but does NOT possess an antiderivative. To demonstrate this fact it suffices to show that the integral z bar dz is
not path independent. Consider two paths: C1:... | 5 | [
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0.00518798828125,
-0.0236816406... | 30,444 | 30444 | |
Question about PDE solution
I am trying to solve the following equation in spherical coordinates:
[tex]
\left( \nabla f \right) \cdot \vec{B} = g
[/tex]
where [itex]g[/itex] is a known scalar function, [itex]\vec{B}[/itex] is a known vector field, and [itex]f[/itex] is the unknown function.
I think the best way to... | 4 | [
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-0.1015625,
0.036376953... | 30,445 | 30445 | |
Rigorous Integration
integral sqrt((x+1)/(x-2)) dx - Wolfram|Alpha click on "show steps" ...
I am confusion how that could be legal in the math world.
I have difficulty written sentences. But i know what i am talking about. Sorry. I rewrite that sentence to a questions. Why the steps in Wolfram Alpha could be correct... | 5 | [
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0.0673828125,
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0.06494140625,
-0.07177734375,
-0.047607421875,
-0.00115203857421875,... | 30,446 | 30446 | |
Use implicit differentiation to prove the power rule
October 14th 2008, 12:54 PM
erimat89
Use implicit differentiation to prove the power rule
Let y = x^(a/b) for integers "a" and "b". Raise both sides to the "bth" power and use implicit differentiation to prove the power rule y' = (a/b)x^(a/b-1).
October 14th ... | 5 | [
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-0.11572265625,
-0.041015625,... | 30,447 | 30447 | |
act
To see that the number that we found in the example goes into both of the original two numbers, 24 and 105, we consider the division problems.
The last one says that
6 = 3(2)
The one before that says
... | 4 | [
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0.01123046875,
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-0.1171875,
-0.0712890625,
0.0123901367... | 30,448 | 30448 | |
Graph theory help!
April 4th 2010, 11:45 PM #1
Newbie
Joined
Apr 2010
Posts
11
Graph theory help!
Let G be a simple graph with n vertices and m edges. Prove:
If n = 11 and m = 46, show that G is connected.
between every two vertices we can have at most 2 edges. so the maximum number of edges is... | 4 | [
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0.10498046875,
-0.0203857421875,... | 30,449 | 30449 | |
How To Build Reliable, Powerful, And Inexpensive Voltage Drops, Part 1: Resistors - Rod & Custom Magazine
Twelve volts was a big deal when domestic manufacturers adopted it in the '50s. Doubling their voltage from 6 made electrical systems comparatively efficient and the increased power ushered in a new
era of luxury a... | 4 | [
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Influence of the Constitutive Flow Law in FEM Simulation of the Radial Forging Process
Journal of Engineering
Volume 2013 (2013), Article ID 231847, 8 pages
http://dx.doi.org/10.1155/2013/231847
Research Article
Influence of the Constitutive Flow Law in FEM Simulation of the Radial Forging Process
Université de Toul... | 4 | [
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-0.0390625,
0.005096... | 30,451 | 30451 | |
Existence of Periodic Solutions for Shunting Inhibitory Cellular Neural Networks with Neutral Delays
Discrete Dynamics in Nature and Society
Volume 2013 (2013), Article ID 143706, 8 pages
http://dx.doi.org/10.1155/2013/143706
Research Article
Existence of Periodic Solutions for Shunting Inhibitory Cellular Neural Net... | 5 | [
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0.024658203125,... | 30,452 | 30452 | |
determine sample size
May 31st 2009, 07:12 PM #1
Banned
Joined
Feb 2009
Posts
97
determine sample size
I hope someone can work out this problem for me to use as a reference for my homework. Thank you so much in advance.
The length in centimeters if n=29 fish yielded an average length of x=16.82 (i d... | 5 | [
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-0.0164794921875,
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0.0079345703125,
0.07275390625,
0.0055... | 30,453 | 30453 | |
Explicit Finite difference
April 1st 2009, 07:12 AM #1
Newbie
Joined
Apr 2009
Posts
1
Explicit Finite difference
i'm doing this programming project about aedes (the mosquito) dispersal.
it involves 2 differential equation. 1 to be solve with runge kutta and the other with finite difference method.
... | 4 | [
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-0.08203125,
-0.05908203125,
-0.0... | 30,454 | 30454 | |
Quadratic Equation Help
December 29th 2010, 09:29 PM #1
Newbie
Joined
Dec 2010
Posts
2
Quadratic Equation Help
Hi, i'm very new to this forum and i am stuck on this problem. Perhaps i'm just having a brain freeze, but i'd like to know how to solve this question.Thanks
The height, h(t) metres, of a b... | 4 | [
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related rates problem
October 22nd 2009, 01:59 PM
jawisbest
related rates problem
The volume of a sphere is increasing at a rate of 10 cm3/sec. Find the rate of change of its surface area when its volume is 32π/3 cm3.
Using my crazy logic I ended up coming up with 20 / r... anything will help
October 22nd ... | 4 | [
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On Certain Subclasses of Analytic Functions Defined by Differential Subordination
International Journal of Mathematics and Mathematical Sciences
Volume 2011 (2011), Article ID 103521, 10 pages
http://dx.doi.org/10.1155/2011/103521
Research Article
On Certain Subclasses of Analytic Functions Defined by Differential Su... | 5 | [
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sec and cot
600 degrees is the same thing as -120 degrees (600=360*2-120), now sec(600) = 1/cos(-120) = 1/cos(120) = -1/cos(60) =-2/sqrt(3) (you are expected to know that cos(60)=sqrt(3)/2) 315 degrees is the
same thing as -45 degrees (315=360-45), now cot(315) = cot(-45) = 1/tan(-45) = -1/tan(45) = -1 (you are expecte... | 4 | [
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Strain Distribution Measurement of a Shear Panel Damper Developed for Bridge Structure
Journal of Structures
Volume 2013 (2013), Article ID 615275, 11 pages
http://dx.doi.org/10.1155/2013/615275
Research Article
Strain Distribution Measurement of a Shear Panel Damper Developed for Bridge Structure
^1Department of Ad... | 4 | [
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Show that sech integral is equal to pi/2
I'm wondering if anyone has any advice on where to even start for proving this: $\int_0^{\infty} sech(x) dx = \frac{\pi}{2}$
It is asked to prove that $\int_0^\infty {\frac{2}<br /> {{e^x + e^{ - x} }}\,dx} = \frac{\pi }<br /> {2}.$ And this does not take much time, 'cause it's... | 5 | [
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Double integration to find the area of a bounded region
May 7th 2011, 09:00 PM #1
Senior Member
Joined
Apr 2010
Posts
487
Double integration to find the area of a bounded region
The question
Use double integration to find the area bounded by $y = x^3$ and $y = x^2$
My attempt
I know that fi... | 5 | [
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Need help with level curves
July 18th 2008, 09:54 AM #1
Newbie
Joined
Jul 2008
Posts
7
Need help with level curves
Hello everyone!
Well,I'm having a problem drawing level curves for piecewise functions.
The problem is, how do I know which value the constant k will hold?
The function is the... | 5 | [
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Laplace equation solution in polar coordinates
June 12th 2012, 11:59 AM
jason403
Laplace equation solution in polar coordinates
Dear all,
In my research I need to solve a polar form of Laplace equation. No big deal, I have solved but I am not able to satisfy the boundary conditions.
For the past three mo... | 4 | [
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Coin Problem
March 15th 2009, 06:48 PM
magentarita
Coin Problem
Joe has a collection of nickels and dimes that is worth $6.05. If the number of dimes was doubled and the number of nickels was decreased by 10, the value of the coins would be $9.85. How many
dimes does he have?
My Set Up:
n + d = 6.0... | 4 | [
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Temperature
December 6th 2009, 04:19 PM
Morgan82
Temperature
A pan of water (46 degrees) was put into a fridge. Ten min later, its temp was 39. Ten min after that, it was 33. Use newtons law of cooling. How cold was the fridge?
I know his law, but how do I find the rate?
December 6th 2009, 06:50 PM
Hallso... | 4 | [
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Prime Number Proof
March 16th 2009, 06:51 PM #1
Newbie
Joined
Mar 2009
Posts
7
How should i start off this proof?
If (2^n -1) is prime, prove that n is prime.
So far I've only got 2 things written down:
1. If 2^n -1 is prime then using divisor notation. 1|(2^n -1) and (2^n -1)|(2^n -1). But... | 4 | [
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ExplanationCentral
Total # Posts: 7
math
The mode is the number that occurs the most times. In game 3, the mode is 122 because it occurs the most times.
MATHEMATICS
The deviation is the difference between a value and the mean. So the deviations are: (290-280) (270-280) (250-280) (300-280) (290-280) This gives you: 10... | 4 | [
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Find a vector field F(x,y) in R^2 such that f is perpendicular to the field ...
September 28th 2013, 08:16 AM #1
Junior Member
Joined
Dec 2009
Posts
68
Thanks
1
Find a vector field F(x,y) in R^2 such that f is perpendicular to the field ...
Find a vector field F(x,y) in R^2 such that F is perpendicul... | 4 | [
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Application of Thermal Network Model to Transient Thermal Analysis of Power Electronic Package Substrate
Active and Passive Electronic Components
Volume 2011 (2011), Article ID 823654, 8 pages
http://dx.doi.org/10.1155/2011/823654
Research Article
Application of Thermal Network Model to Transient Thermal Analysis of ... | 4 | [
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A Characterization of Power Method Transformations through
Journal of Probability and Statistics
Volume 2011 (2011), Article ID 497463, 22 pages
http://dx.doi.org/10.1155/2011/497463
Research Article
A Characterization of Power Method Transformations through L-Moments
Section on Statistics and Measurement, Departme... | 4 | [
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Similar but unitary equivalent
November 5th 2011, 11:52 AM #1
MHF Contributor
Joined
Mar 2010
From
Florida
Posts
3,093
Thanks
5
Similar but unitary equivalent
Show that the matrices
$A=\begin{bmatrix}1&3&0\\0&2&4\\0&0&3\end{bmatrix} \ \text{and} \ \begin{bmatrix}1&0&0\\0&2&5\\0&0&3\end{bmatr... | 4 | [
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0.00... | 30,471 | 30471 | |
Story Problem with Derivatives
November 18th 2009, 01:03 PM #1
Member
Joined
Oct 2008
Posts
80
Story Problem with Derivatives
Water is flowing into a tank at the following rate: $E(t) = \frac{t+2}{t^2+1}$. The water is leaving the tank at the rate: $D(t) = sint \cdot \frac{10t}{\sqrt{t^4 + 5}}$.
(a)... | 4 | [
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NP-Complete question
December 5th 2011, 03:45 AM #1
Newbie
Joined
Dec 2011
Posts
16
NP-Complete question
An NFA (nondeterministic finite automaton) is acyclic if there is no path from a state to itself.
Decision problem: Given two acyclic NFAs A and B, does L(A)=L(B), i.e. does A accept the same lan... | 4 | [
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Determining the first three nonzero terms for Taylor polynomial approximation for IVP
December 3rd 2011, 03:37 PM #1
Super Member
Joined
Nov 2008
Posts
597
Determining the first three nonzero terms for Taylor polynomial approximation for IVP
I only know how to do this with regular equations. How do I do ... | 5 | [
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More optimization...
August 3rd 2010, 11:10 AM #1
Member
Joined
Feb 2010
From
United States
Posts
155
Thanks
1
More optimization...
Given C(x) = 680 + 4x + 0.01x^2 and demand is p(x) = 12 - x/500, find the value of x that will maximize profit.
I assume that I somehow need to find the minimum... | 4 | [
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Quotient Groups - Dummit and Foote, Section 3.1, Exercise 17
November 19th 2013, 11:01 PM #1
Quotient Groups - Dummit and Foote, Section 3.1, Exercise 17
I am reading Dummit and Foote Section 3.1: Quotient Groups and Homomorphisms.
Exercise 17 in Section 3.1 (page 87) reads as follows:
-----------------... | 4 | [
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Third coordinate of triangle (not right angled)
January 31st 2010, 12:50 AM #1
Newbie
Joined
Jan 2010
Posts
3
I have a triangle (as per below figure)
the Known points are all the triangle distances ie A,B,C
The two vertices are known,x1,y1, x2,y2.
I require the third vertice formula / equatio... | 4 | [
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L'Hopital/limits question
January 8th 2011, 09:57 AM #1
Junior Member
Joined
Nov 2010
Posts
41
L'Hopital/limits question
Here's the question:
lim(x-->infinity) $x/((1+x^2)^(1/2))$
One approach (that Wolfram Alpha used):
=square root of lim $x^2/(1+x^2) = 1$
(using L'hopital)
Another... | 5 | [
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On Extremal Self-Dual Ternary Codes of Length 48
International Journal of Combinatorics
Volume 2012 (2012), Article ID 154281, 9 pages
http://dx.doi.org/10.1155/2012/154281
Research Article
On Extremal Self-Dual Ternary Codes of Length 48
Lehrstuhl D fĂĽr Mathematik, RWTH Aachen University, 52056 Aachen, Germany
... | 5 | [
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7.2 Formulas for calculating
7.2 Formulas for calculating estimated breeding value based on uniformly related phenotypes
Figure 7.1 shows the relationship between phenotype measurements of a uniformly related group of individuals, P's, and the breeding value index (I), which is an estimate of the true breeding value
... | 4 | [
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Weibull Plots Predict System Reliability
Here’s a way to calculate the reliability for designs with several subsystems.
Weibull Plots Predict System Reliability
Who, What, Where
Authored by
John BernerApplications Research Inc.
Golden Valley, Minn.
and
James McLinn
Teradyne Inc.
Fridley, Minn.
Edited by
Paul ... | 4 | [
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Present Value
February 15th 2011, 04:47 PM #1
Junior Member
Joined
Nov 2008
Posts
53
Present Value
You have just won the $1000 per week for life jackpot. A fortune teller had predicted this for you a week ago. The fortune teller also said you will live to the age of 90. You are currently 20
years old... | 5 | [
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Trig Set..
March 11th 2007, 05:57 PM #1
WahedKhandabi
Guest
Trig Set..
A buoy oscillates in simple harmonic motion Y=A cos cot as waves move past it. The buoy moves a total of 3.5 feet (vertically) from its low point to its high point. It returns to its high point
every 10 seconds.
a) Write an equation de... | 5 | [
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0.076171875,
0.00186920166015625,
-0.008605957... | 30,483 | 30483 | |
Very basic topology question
June 15th 2011, 09:18 PM #1
Newbie
Joined
Dec 2009
Posts
8
Thanks
1
Very basic topology question
Hello, I am having some difficulty on problem 17 of chapter 2 in Rudin's Principles of Mathematical Analysis. The problem reads: "Let E be the set of all x in [0,1] whose deci... | 5 | [
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... | 30,484 | 30484 | |
Position vectors
September 26th 2008, 03:58 AM #1
Newbie
Joined
Sep 2008
Posts
8
Position vectors
urgent help, A Level Maths Mechanics
A particle has position vector 2i + j initially and is moving with speed 10ms^-1 in the direction 3i - 4j. Find its position vector when t = 3.
Unit vector in d... | 4 | [
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Total ring of fractions vs. Localization
up vote 15 down vote favorite
6
Let $R$ be a commutative ring and denote by $K(R)$ its total ring of fractions, the localization of $R$ with respect to $R_{\mathrm{reg}}$. For every multiplicative subset $U \subseteq R$ there is a
canonical map of $R$-algebras $$H : K(R)[U^{-1}... | 5 | [
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0.0... | 30,486 | 30486 | |
Spearman’s Rank Correlation Detailed
We show how to calculate Spearman’s rho and how to use it for hypothesis testing.
Example 1: The table in Figure 1 associates the IQ of each adolescent in a sample with the number of hours they listen to rap music per month. Determine the strength of the correlation between IQ and... | 5 | [
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-0.... | 30,487 | 30487 | |
Permutation group order
September 11th 2007, 06:45 PM #1
Super Member
Joined
Mar 2006
Posts
705
Thanks
2
Permutation group order
Show that $A_{8}$ contains an element of order 15.
Note: $A_{8}$ is the group of even permutation of 8.
I really don't know how to start this proof, please help.
... | 5 | [
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Validation of Antenna Modeling Methodology in IMT-Advanced Channel Model
International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 282797, 9 pages
http://dx.doi.org/10.1155/2012/282797
Research Article
Validation of Antenna Modeling Methodology in IMT-Advanced Channel Model
Key Laboratory of U... | 4 | [
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laplace inverse
find laplace inverse of log(s+a)/(s+b) do we have to apply power series in it
If you just want the answer, you can get that here: Inverse Laplace transform - Hollywood
You can use the fact that $\mathcal{L}(tf(t))=\int_{0}^{\infty}e^{-st}[tf(t)]dt=\int_{0}^{\infty}-\frac{d}{ds}e^{-st}f(t)dt=-\frac{d}{... | 5 | [
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0... | 30,490 | 30490 | |
Verify that f is a function? Something went wrong in my equation solving or?
October 22nd 2012, 03:36 AM
BruceAlge
Verify that f is a function? Something went wrong in my equation solving or?
Greetings guys
I'm solving an assignment for class tomorrow and have to verify that this relation is a function.
... | 5 | [
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marginal density, conditional density, and probability
March 24th 2008, 06:57 AM #1
Newbie
Joined
Mar 2008
Posts
21
marginal density, conditional density, and probability
I have some of this problem done, but I can't figure it all out, so I will post how I have tried to solve each part after I post the q... | 5 | [
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-0.036865234... | 30,492 | 30492 | |
Homework Help
Posted by Jessica on Wednesday, November 15, 2006 at 3:59pm.
Two cars leave town going opposite directions. One car is traveling 55 mph, and the other is traveling 65 mph How long will it take before they are 180 miles apart?
Hint: The time for both cars is the same and can be represented by "t." The to... | 4 | [
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Homework Help
Posted by Anonymous on Sunday, April 7, 2013 at 4:32pm.
Im not getting these answers at all, please help.
Find a formula for the fourth degree polynomial p(x) whose graph is symmetric about the y-axis (meaning it has no odd powers of x), and which has a y-intercept of 0, and global maxima at (4,512) and... | 4 | [
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Homework Help
Posted by Anom on Wednesday, October 31, 2012 at 2:36pm.
An offshore well is 2 miles off the coast. The refinery is 4 miles down the coast. If a laying pipe in the ocean is twice as expensive as on land, what path the pipe should follow in order to
minimize the coast.
Is the answer 2.1? Can you some lis... | 5 | [
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find the max value of integral
October 13th 2009, 06:32 AM #1
Junior Member
Joined
Oct 2009
Posts
44
If $f: \mathbb{R}\mapsto\mathbb{R}$ is continuous, and $\int^1_0\left(f(x)\right)^2 dx = 3$.
Find the maximum value of $\int^1_0 x f(x) dx$
Please explain to me...
You are so nice^^
by Ho... | 5 | [
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Homework Help
Posted by bryan on Sunday, February 3, 2013 at 12:57pm.
A lighthouse is located on a small island 3 km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute. How fast is the beam of light moving along the
shoreline when it is 1 km from P?
• Calculus - Da... | 5 | [
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factorial notation help
December 8th 2008, 09:24 PM
Carrick
factorial notation help
(n+2)/n!=56
I'm new to this and having trouble trouble breaking this down, could someone please give me a hint to get this started?
December 8th 2008, 09:29 PM
chiph588@
you are saying to divide $n+2$ by $n!$ and get ... | 4 | [
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Pipe Related Formulas
PIPE & THREADING CO.
... | 5 | [
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