content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Homework Help
Posted by Johnny on Thursday, November 8, 2012 at 6:37am.
A 40-foot ladder is leaning against a house when its base starts to slide away. By the time the base is 32 feet from the house the base is moving at a rate of 4ft/sec.
a. How fast is the top of the ladder moving down the wall at that moment?
b. ... | 5 | [
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Factorise and solve...
March 7th 2009, 10:37 PM #1
Factorise and solve:
2x^2 - 7x - 4
Also, how do you factorise using cross multiplication? Somebody told me to do that but I didn't know what that meant. Anyway...if anyone could show me that would be great also!
Sorry...I meant:
2x^2 - 7x - 4 =... | 4 | [
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0.02551269531... | 1,401 | 1401 | |
Homework Help
Posted by Kylie on Saturday, November 3, 2012 at 6:10pm.
The perimeter of a triange with sides a,b,and c is 24 cm. Side a is 2cm longer than side b. The ration of the lenghts of sides b and c is 3:5. What are the lenghts of the three sides of the triangle?
• algebra 1 - Steve, Saturday, November 3, 20... | 4 | [
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0.042480468... | 1,402 | 1402 | |
Radical Equation to standard form trinomial (with math code)
October 10th 2010, 11:45 PM #1
Newbie
Joined
Sep 2010
Posts
11
Radical Equation to standard form trinomial (with math code)
$\sqrt{2} x^2 + 5x + \sqrt{2} = 0$
Do I square it so that it becomes the following?
$2x^4 + 25x^2 + 2 = 0$
... | 4 | [
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st: RE: RE: Re: fixed effects and SUR
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
st: RE: RE: Re: fixed effects and SUR
From "J. Yimin Zhou" <zymx@yahoo.com>
To <statalist@hsphsun2.harvard.edu>
Subject st: RE: RE: Re: fixed effects and SUR
Date Wed, 23 Oct 2002 13:29:47 +090... | 5 | [
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Homework Help
Posted by Jon on Tuesday, February 26, 2008 at 2:47pm.
Use Cramer's Rule to solve: 3x-5y=21 and 4x+2y=2.
a=3, b=-5, c=4, d=2, e=21, f=2
21(2)-(-5)(2) divided by 3(2)-(-5)(4)
=52/26= x=2
3(2)-21(4) divided by 3(2)-(-5)(4)
=78/26= y=3
answer:
(2,3)
• Math - drwls, Tuesday, February 26, 2008 at 6:... | 4 | [
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Shawn Lauzon
The name of the Knewton tech blog is “N choose K”. If it’s been a long time since you set foot in a math class, this may not have any meaning to you. However, it’s an interesting concept, and really
not all that difficult. In this post, I’ll go over what the term means in simple English and discuss how we ... | 4 | [
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... | 1,406 | 1406 | |
Background on the Bank of Sweden Prize in Economic Sciences in Memory of
Alfred Nobel 1997
Additional background material on the Bank of Sweden Prize in Economic Sciences in Memory of Alfred Nobel 1997.
The Royal Swedish Academy of Sciences has decided to award the Bank of Sweden Prize in Economic Sciences in Memo... | 4 | [
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eigenvalues and eigenfunctions
March 27th 2009, 12:37 PM #1
Member
Joined
Nov 2006
Posts
142
eigenvalues and eigenfunctions
Can someone help me with this?
How do I find the eigenvalues and eigenfunctions for the Sturm-Liouville problem
$x^2y''+xy'+3y=uy$;
$y(1)=0, y(2)=0$
Thanks in adva... | 4 | [
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Rrrrrrrrrrrr by Yangma1
CHAPTER 1
1.
List the seven SI base quantities, units, and symbols.
TIME Second (s)
2.
Give the correct SI derived units of the following quantities. Density Speed Acceleration Force Pressure kg/m3
Energy
3.
Convert the following: μm (Ans. 1.22)
a. 1.22 x 10-9 km = b. 6.523 x 10-4 nm = c.... | 4 | [
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... | 1,409 | 1409 | |
Homework Help
Recent Homework Questions About Calculus
Post a New Question | Current Questions
Calculus 1
a rectangular storage area is to be constructed along the sides of a tall building. A security fence is required along the three remaining sides of the area. What is the maximum area that can be
enclosed with 100... | 4 | [
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Problem 8
8. Solve for x log[4] (x + 3) - log[4] (x-1) = 1
First express the left side as a single log.
Now change to exponential form
Clear denominators
x + 3 = 4(x - 1)
Remove parentheses
... | 4 | [
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Homework Help
Posted by suma on Saturday, August 3, 2013 at 7:19am.
The sum of second term and fourth term of G.P is 30 and difference between sixth term and second term is 90,how to find third term
• math - Reiny, Saturday, August 3, 2013 at 9:05am
first term --- a
common ratio --- r
The sum of secon... | 4 | [
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Estimating NFL Win Probabilities for Matchups Between Teams of Various Records » Sports Reference
Posted by Neil on October 30, 2012
WARNING: Math post.
PFR user Brad emailed over the weekend with an interesting question:
"Wondering if you've ever tracked or how it would be possible to find records vs. records s... | 5 | [
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Math please help! Urgent
Posted by Jessica on Sunday, November 25, 2012 at 3:06am.
Find the height of an equilateral triangle with sides of length 6 cm ' please show ur work
• Math please help! Urgent - drwls, Sunday, November 25, 2012 at 5:57am
Let the side length of the equilateral triangle be L. Bisect one ... | 4 | [
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Heath Jarrow and Morton Example Three: Modeling Interest Rates with Two Factors and Rate and Maturity-Dependent Volatility
The author wishes to thank Robert A. Jarrow for his encouragement and advice on this series of worked examples of the HJM approach. What follows is based heavily on Prof. Jarrow’s Modeling Fixed
In... | 4 | [
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numpy.fft.fft
numpy.fft.fft¶
numpy.fft.fft(a, n=None, axis=-1)[source]¶
Compute the one-dimensional discrete Fourier Transform.
This function computes the one-dimensional n-point discrete Fourier Transform (DFT) with the efficient Fast Fourier Transform (FFT) algorithm [CT].
a : array_like
... | 5 | [
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-0... | 1,416 | 1416 | |
Posts by
Posts by Lisa
Total # Posts: 2,967
math
X+y=54 5x+20y=780 -5(x+y=54) -5x-5y=-270 5x+20y=780 15y=510 Y=34 X=20 5(20)+20(34)=780 Five dollars bills = 20
Algebra 1- Math
2x-3y =-3 -1(3x-3y=18) 2x-3y=-3 + -3x+3y=-18 (add two equations) -x = -21 x = 21 2(21)-3y =-3 42-3y=-3 -3y=-45 y=15
math
A man sells a nut ... | 4 | [
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st: Variance of a ratio
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
st: Variance of a ratio
From Leonelo Bautista <lebautista@wisc.edu>
To statalist@hsphsun2.harvard.edu
Subject st: Variance of a ratio
Date Fri, 17 Sep 2004 14:32:05 -0500
I have a variable R that represents... | 4 | [
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0.0390625,
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Something you should know about: Quantifier Elimination (Part I)
by Arnab Bhattacharyya
About a month ago, Ankur Moitra dropped by my office. We started chatting about what each of us was up to. He told me a story about a machine learning problem that he was working on with Sanjeev
Arora, Rong Ge, and Ravi Kannan. On ... | 4 | [
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0... | 1,419 | 1419 | |
Partial Fractions
June 23rd 2008, 10:36 AM
JonathanEyoon
Partial Fractions
Need some insight into how to determine A, C, and D
(x^2 - 2x - 1) /(((x - 1)^2)(x^2 + 1)
A / ( x - 1) + B / (x - 1)² + (Cx +D) / (x² + 1)
x² - 2x - 1 = A(x - 1 )(x² + 1) - (x² +1) + (Cx + D)(x - 1)²
Now I know... | 5 | [
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-... | 1,420 | 1420 | |
Laplace transformation?
January 1st 2008, 10:29 AM #1
Junior Member
Joined
Dec 2007
Posts
42
Laplace transformation?
I Have four question about Laplace transformation.
1. Can anyone show me full but easy example of Laplace transformation. I don't quite understand how transforming some basic function... | 5 | [
-0.007659912109375,
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CSALT model
(added note: this is the initial post covering the CSALT model, index to other posts)
It would be nice to have a simple climatology tool that illustrates the trend of modern-day global warming, while also providing a view of the underlying mechanisms. What I came up with is the CSALT
model, which is bas... | 4 | [
-0.0908203125,
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-0... | 1,422 | 1422 | |
Basic Binomial Distribution... Complex Permutation
September 13th 2010, 08:25 AM
Jasonvdm
Basic Binomial Distribution... Complex Permutation
Hey guys, here's my problem:
"Ten percent of cadets at the police academy chew gum regularly. What is the probability (to the nearest percent) that, if you pick 4 cade... | 5 | [
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0.056640625,
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0.06640625,
-0.038330078125,
-0.007293701171875,
0.033203125,
-0.032714843... | 1,423 | 1423 | |
Homework Help
Posted by Jingchi on Thursday, October 24, 2013 at 11:25am.
Find the perimeter of the hypocycloid of four cusps,
x^2/3+y^2/3=1/9
• math - Steve, Thursday, October 24, 2013 at 12:18pm
find the arc length of one cusp:
2/3 x^(-1/3) + 2/3 y^(-1/3) y' = 0
y' = -(y/x)^(1/3)
Y' = -√(1/9 - ... | 5 | [
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0... | 1,424 | 1424 | |
Model Selection in Bayesian Linear Regression - Lindons Log
Model Selection in Bayesian Linear Regression
Previously I wrote about performing polynomial regression and also about calculating marginal likelihoods. The data in the former and the calculations of the latter will be used here to exemplify
model selection. ... | 5 | [
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0.01635742... | 1,425 | 1425 | |
Intersection of three planes
Solve the following system of equations and explain what the solution means geometrically: 1) x-y+z=10 2) 2x+3y-2z=-21 3) 0.5x+0.4y+0.25z=-0.5
ok im stuck here: 0 0 43 | 382 0 7 -15 |-95 -30 -31 0 |125
how did you get that? can you show me please?
Im pretty sure you need to use substitui... | 5 | [
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-0.0471... | 1,426 | 1426 | |
Lagrange Multipliers and Inequalities
July 22nd 2010, 03:19 PM #1
Member
Joined
Jun 2008
From
Plymouth
Posts
119
Thanks
5
Lagrange Multipliers and Inequalities
Is there a way to apply the method of Lagrangian Multipliers when your equation of constraint is an inequality(it won't be called an equa... | 5 | [
-0.032470703125,
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0.033447265625,
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0.0859375,
0.00299072265625,
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0.0120849609375,
0.047119140625,
... | 1,427 | 1427 | |
metry
From Wikipedia, the free encyclopedia
The golden section is a line segment divided according to the golden ratio: The total length a + b is to the longer segment a as a is to the shorter segment b.
In mathematics and the arts, two quantities are in the golden ratio if the ratio of the sum of the quantities ... | 4 | [
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0.08740234375,
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-0.0380859375,
0... | 1,428 | 1428 | |
Volume of a sphere with a cyclinder drilled through it
December 7th 2006, 07:58 PM #1
Member
Joined
Oct 2006
Posts
81
Volume of a sphere with a cyclinder drilled through it
A ball of radius 13 has a round hole of radius 6 drilled through its center. Find the volume of the resulting solid.
This doesn... | 5 | [
0.0390625,
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0.0419921875,
-... | 1,429 | 1429 | |
Average,Chebyshev’s theorem,skewness
August 5th 2007, 04:13 AM #1
Newbie
Joined
May 2007
Posts
24
Average,Chebyshev’s theorem,skewness
please solve following quesitons
Q#1The average IQ of 10 students in a mathematics course is 114.If 9 of the students have IQ’s of 101, 125, 118, 128, 106, 115, 99,1... | 4 | [
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0.06591796875,
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0.0576171875,
0.0849609375,
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0.08154296875,
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0.0311279296875,
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-0.049072265625,
-0... | 1,430 | 1430 | |
Square of 3 real numbers
April 27th 2010, 08:40 AM
nahduma
Square of 3 real numbers
Prove that, for all real numbers a,b and c,
(a+b+c)^2 <= 3(a^2 + b^2 + c^2)
Further, show that 3 is the smallest real number with this property.
I haven't been able to prove it yet - all i've done is go around in cir... | 4 | [
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0.009765625,
0.03247070... | 1,431 | 1431 | |
Optimal Derivative Estimators
Designing Optimal Derivative Estimators
To make this page somewhat self sufficient, this first section summarizes background material that is presented more thoroughly in other pages on this site [1] and elsewhere [2][3]. The problem is to
devise a filter to estimate the first derivative ... | 4 | [
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0.00543212890625,
... | 1,432 | 1432 | |
Calculus - not sure if my work is correct?
Number of results: 54,923
Calculus
(x^3+1)^2 then dy/dx i got 6x^2(x^3+1), not sure if it is correct.
March 24, 2010 by Anonymous
Calculus - not sure if my work is correct?
A 15ft ladder leans against a building and its base starts to slide down the wall. The base is moving ... | 4 | [
-0.08349609375,
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0.059814453125,
-0.015991210937... | 1,433 | 1433 | |
Quick Lin Alg question
September 4th 2008, 08:22 PM #1
Member
Joined
May 2006
Posts
148
Thanks
1
Quick Lin Alg question
If I have the following matrix (3x3):
1 0 1 5
0 1 0 -7/5
0 0 5 7
Is it legal to just take 1/5 of row 3 and say my new matrix is then:
1 0 1 5
0 1 0 -7/5
... | 5 | [
-0.08056640625,
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0.017822265625,
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... | 1,434 | 1434 | |
Homework Help
Posted by Billy Bob on Tuesday, May 22, 2012 at 6:41pm.
I have two questions
two forest fire towers, A and B are 20.3km apart. From tower A, the bearing of tower B is 70 degrees. The ranger in each tower observes a fire and radios the bearing from the tower. the bearing from
tower A is 25 degrees and fr... | 4 | [
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0.0947265625,
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0.033203125,
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0.046142578125,
-0.07421875,
-0.01324462890625,... | 1,435 | 1435 | |
Homework Help
Posted by Katie on Friday, March 16, 2012 at 10:33pm.
Two children, each with mass m = 11.0 kg, sit on opposite ends of a narrow board with length L = 4.5 m, width W = 0.30 m, and mass M = 9.4 kg. The board is pivoted at its center and is free to rotate
in a horizontal circle without friction. What is th... | 5 | [
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0.049560546875,
0.0... | 1,436 | 1436 | |
Finding the smallest positive integer with prime factors.
October 11th 2010, 07:34 AM #1
Newbie
Joined
Oct 2010
Posts
3
Finding the smallest positive integer with prime factors.
First I would like to make it clear that I'm not asking this to help with my school work, as I don't go to school and I'm self-... | 4 | [
0.0791015625,
0.00537109375,
-0.05322265625,
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0.0791015625,
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0.003631591796875,
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0.060791015625,
0.07470703125,
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-0.04296875,
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0.04150390625,
-0.0145263671875,
... | 1,437 | 1437 | |
Homework Help
Posted by Guadalupe on Monday, May 14, 2007 at 5:19pm.
How do you do this one?
Almir can seal a driveway in 4 hours. Working together, he and Louis can seal it in 2.3 hours. How long would it take Louis to seal it working alone?
Thanks in advance.
D:3+4D=19
Driveway (D) = Rate * Time
let Louis' time... | 4 | [
0.005523681640625,
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0.044189453125,
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0.00811767578125,
... | 1,438 | 1438 | |
Laplace transform
March 27th 2008, 01:48 AM #1
Laplace transform
Using Laplace Transform I was asked to solved this eq.
$<br /> \frac{{d^2 y}}<br /> {{dx^2 }} + 4\frac{{dy}}<br /> {{dx}} + 13y = 145\cos 2t<br />$$<br /> {\text{ }};y(0) = 9<br />$ and $<br /> \left. {\frac{{dy}}<br /> {{dx}}} \right|_{t = 0} ... | 5 | [
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0.00823974609375,
-0.036376953125,
-0.01... | 1,439 | 1439 | |
Polynomial Functions
Finding the roots of higher degree polynomials is much more difficult than finding the roots of a quadratic function. A few tools do make it easier, though. 1) If r is a root of a polynomial
function, then (x - r) is a factor of the polynomial. 2) Any polynomial with real coefficients can be writte... | 4 | [
0.002899169921875,
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-0.04541015625,
0.041... | 1,440 | 1440 | |
Minimum Price?
April 14th 2010, 05:08 PM #1
Newbie
Joined
Apr 2010
Posts
19
Minimum Price?
The price P of a certain computer system decreases immediately after its introduction and then increases. If the price P is estimated by the formula $P = 160t^2 - 1700t + 6700$, where t is the
time in months fr... | 4 | [
0.00250244140625,
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Re: st: RE: Iterative solving of an equation
Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
R... | 5 | [
-0.123046875,
0.01904296875,
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0.060546875,
-0... | 1,442 | 1442 | |
Help me please so I don't fail my assignment when I send it in
July 1st 2012, 03:52 PM #1
Newbie
Joined
Jul 2012
From
moberly lake
Posts
1
Hi I am doing a statistics course for my CGA (Certified General Accountant) and I am having trouble on a assignment and I was hoping that some one could over look ... | 5 | [
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-0.105468... | 1,443 | 1443 | |
Determining whether 4 points are coplanar. Answer check
October 25th 2008, 11:11 PM #1
Member
Joined
Jun 2008
Posts
175
The question asks, whether the points are (1,0,-1) , (0,2,3) and (-2,1,1) and (4,2,3) are coplanar.
I let (1,0,-1) be point A
let (0,2,3) point B
let (-2,1,1) point C
le... | 4 | [
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0.039306640625,
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-0.0668945... | 1,444 | 1444 | |
of
International Journal of Mathematics and Mathematical Sciences
Volume 11 (1988), Issue 4, Pages 769-780
doi:10.1155/S0161171288000948
Pythagorean triangles of equal areas
Department of Mathematics and Computer Science, The University of Wisconsin, Whitewater 53190, Wisconsin , USA
Received 28 January 1987; Revi... | 4 | [
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-0.069824... | 1,445 | 1445 | |
Help please I'm desperate
September 8th 2009, 04:39 AM
underachiever
Help please I'm desperate
I have been given this question for a tut but am unsure of how to answer it as it doesnt seem to have enough information for me, any help is greatly appreciated:
A company that markets user assembled furniture sel... | 4 | [
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-0... | 1,446 | 1446 | |
limit problem...
April 23rd 2009, 08:28 AM #1
Junior Member
Joined
Jan 2009
From
india
Posts
51
limit problem...
Q:let fn(x)=n(sinx)^(2n+1)*cos(x)
then find the value of
{ limt n tends to inf of integral of fn(x) from 0 to pi/2}
-{integral of limit n tends to inf of fn(x) from 0 to pi/2}
... | 5 | [
-0.076171875,
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0.01416015625,
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0.0000134706497192... | 1,447 | 1447 | |
Refactorable Numbers - A Machine Invention
Journal of Integer Sequences, Vol. 2 (1999), Article 99.1.2
Refactorable Numbers - A Machine Invention
... | 5 | [
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... | 1,448 | 1448 | |
Permutation
Permutations can be viewed as braids but braids are much more general. (if you consider a permutation and apply it to itself it returns to the identical permutation, if you have a braid that's a
transposition and apply it to itself you get a double-twist, one more time you get a triple twist and so forth th... | 5 | [
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0.158203125,
-0.07373046875,
0.... | 1,449 | 1449 | |
centre
May 13th 2011, 09:39 AM
alexandrabel90
centre
why is it we say that the centre of SU(N) is isomorphic to Z (mod n) and center of U(N) is isomorphic to U(1) when
both their centres are {aI : lal=1}
are they different or the same
May 13th 2011, 07:10 PM
Drexel28
Quote:
Well it's almost... | 4 | [
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-0.030151367... | 1,450 | 1450 | |
Homework Help
Posted by Javier on Friday, November 12, 2010 at 12:23am.
Find the maximum area of a triangle formed in the first quadrant by the x-axis, y-axis, and a tangent line to the graph of y = (x+1)^-2
• Math - Reiny, Friday, November 12, 2010 at 9:55am
let the point of contact of the tangent be (a,b)
... | 5 | [
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0.046142578125,
0.03173828125,
0.0576171875,
0.0018920898... | 1,451 | 1451 | |
Homework Help
Posted by Yuni on Friday, July 29, 2011 at 8:08pm.
the volume of an cylindrical can with a radius r cm and height h cm is 128000 c^3, show that the surface area of the can is A=2(22/7)r^2 + 246000/r. Find the value for r to minimize the surface area.
*i know what the quest. ask but i do not know how to ... | 5 | [
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0.0419... | 1,452 | 1452 | |
Friction and coefficient of friction questions!
March 16th 2006, 08:55 AM
Confuzzled?
Friction and coefficient of friction questions!
Whenever a numerical value of g is required take g=9.8 metres per second per second
1)A body of mass 2kg is held in limiting equillibrium on a rough plane inclined at 20 degre... | 4 | [
-0.07080078125,
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... | 1,453 | 1453 | |
Graphing Inequalities (with worked solutions & videos)
Graphing Linear Inequalities
In this lesson we will learn
• how to graph linear inequalities.
• how to graph systems of linear inequalities.
We also have a systems of inequalities calculator that can display the shaded region that satisfies all the given ine... | 4 | [
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Calculation of probability that two sets of outcomes are always disjoint
April 1st 2013, 07:29 AM #16
Member
Joined
Mar 2013
From
BC, Canada
Posts
95
Thanks
15
Re: Calculation of probability that two sets of outcomes are always disjoint
I think you are correct, but the probability would go to zer... | 4 | [
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-0... | 1,455 | 1455 | |
search results
Expand all Collapse all Results 1 - 17 of 17
1. CMB 2011 (vol 56 pp. 102)
Eigenvalue Approach to Even Order System Periodic Boundary Value Problems
We study an even order system boundary value problem with periodic boundary conditions. By establishing the existence of a positive eigenvalue of ... | 4 | [
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0.... | 1,456 | 1456 | |
Homework Help
Posted by Penelope on Thursday, February 21, 2013 at 4:15am.
A committee, which consists of two mathematicians and three scientists, will be formed from four mathematicians and six scientists. How many possible committees can be formed if :
a. any of the mathematicians and scientists are included?
b. o... | 4 | [
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0.019775390625,
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-0.033... | 1,457 | 1457 | |
South African Journal of Science
Services on Demand
Article
Indicators
Related links
Share
Print version ISSN 0038-2353
S. Afr. j. sci. vol.103 no.11-12 Pretoria Nov./Dec. 2007
... | 4 | [
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Number theory
September 26th 2012, 10:51 PM #1
Senior Member
Joined
Sep 2012
From
Sweden
Posts
250
Thanks
6
Number theory
Hi i need help with this problem.. The quest is what positive rest do i get if i divide it with 8
7^41+17^20-6
I should post this on number Theory section! Im sorry... | 4 | [
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2 Calc questions
March 5th 2010, 10:10 AM
BrownianMan
2 Calc questions
1) If s(t) = 2t^3 - 21t^2 + 60t is the position function of a particle moving in a straight line, would you be able to find its total distance traveled in, say 3 seconds, by finding s(0), s(1), s
(2), s(3), and calculating the absolute va... | 5 | [
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0.039306640625,
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0.0... | 1,460 | 1460 | |
Homework Help
Posted by jason on Sunday, December 21, 2008 at 3:05am.
Two balls are connected by a string that stretches over a massless, frictionless pulley. Ball 1 has a mass of 0.45 kg and is held 0.74 m above the ground. Ball 2 has a mass of 5.7 kg and is held 0.88
m above the ground. When the balls are released, ... | 5 | [
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0.0178222... | 1,461 | 1461 | |
Compound Interest Shortcut
A good shortcuts on Compound Interest.
-------------
We all know the traditional formula to compute interest...
CI = P*(1+R/100)^N - P
The calculation get very tedious when N>2 (more than 2 years). The method suggested below is elegant way to get CI/Amount after 'N' years. You need to recall ... | 4 | [
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0.040527... | 1,462 | 1462 | |
Probability - coin tosses
April 30th 2008, 09:11 AM #1
Newbie
Joined
Dec 2007
Posts
8
Probability - coin tosses
Need help with a probability problem that is causing me some difficulty.
A coin is tossed 8 times. What is the probability of more than six tails?
Thanks.
garrett88
Hmm, prob... | 5 | [
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CS 276 Lecture 11: One-Way Functions
Summary
Today we begin a tour of the theory of one-way functions and pseudorandomness.
The highlight of the theory is a proof that if one-way functions exist (with good asymptotic security) then pseudorandom permutations exist (with good asymptotic security). We have seen that
pse... | 4 | [
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Expected value of the logistic distribution?
October 5th 2008, 08:50 PM
evidor
Expected value of the logistic distribution?
How would you show that the expected value of the logistic distribution is equal to it's mean? ie E(X)=mu
$E(X) = \int_{-\infty}^{\infty} {\frac{xe^{-(x-\mu)/s}} {s\left(1+e^{-(x-\mu)/... | 5 | [
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Prove (Limit)
Can someone help me prove this? sqrt(x)e^sin(pi/x) = 0 , x--> 0+ (from the right)
$sin(\pi/x)$ lies between -1 and 1 for all x so $e^{sin(\pi/x)}$ lies between $e^{-1}$ and $e^1$ for all x. The important point is that it is bounded. Since $\sqrt{x}$ goes to 0, the limit of this
function is 0.
| 4 | [
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2 convergence in distribution questions
September 27th 2008, 08:19 PM #1
Newbie
Joined
Sep 2008
Posts
4
2 convergence in distribution questions
First one:
Suppose $X_n \sim Bin(n, p)$. Show that as $n \rightarrow \infty$
$<br /> \frac{X^2_n - n^2 p^2}{2(pn)^\frac{3}{2} \sqrt{1-p})} \stackrel{D}{\... | 5 | [
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... | 1,467 | 1467 | |
Homework Help
Posted by connie on Thursday, March 15, 2012 at 12:48pm.
REINY, Thank you for your answer and the answer is obviously correct when you go back and do the multiplying ......however , I do not just want the answer, I desperately wish to understand from start
to finish how you got the answer. I am sorry if ... | 4 | [
0.007293701171875,
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... | 1,468 | 1468 | |
Re: st: RE: re: missing dummy variable
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
Re: st: RE: re: missing dummy variable
From Maarten buis <maartenbuis@yahoo.co.uk>
To statalist@hsphsun2.harvard.edu
Subject Re: st: RE: re: missing dummy variable
Date Thu, 11 Oct 2007 10:31:5... | 5 | [
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-0.0869140625... | 1,469 | 1469 | |
st: Re: RE: Re: RE: Sample size
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
st: Re: RE: Re: RE: Sample size
From "Don Spady" <dspady@ualberta.ca>
To <statalist@hsphsun2.harvard.edu>
Subject st: Re: RE: Re: RE: Sample size
Date Mon, 28 Apr 2003 11:52:49 -0600
Paul
Thank yo... | 5 | [
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September 2013
September 2013
<<August September October>>
For those of you who asked, testing your submissions is not trivial. We used a SAT solver to do that, and even used it as a programming challenge in an IEEEXtreme-7.0 competition.
The problem was posed several years ago on the RAD challenge site (the site i... | 4 | [
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Math Help
I would go for a substitution, maybe $u(x)=\log(y(x)).$ What does that give you?
Well, you need to translate the DE over to the variable u. You'll need to assemble all the ingredients of your original DE, but with u's instead of y's. What do you suppose you'll need?
Sorry to say, I cant understand your mat... | 4 | [
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-... | 1,472 | 1472 | |
Mass on a spring problem
You will need to solve the homogeneous problem $\frac{d^2x}{dt^2} + w^2x = 0$ Then you will find a particular solution you can do this using the method of undetermined coefficients. Then you add the
two solutions together.
Can you explain how to find the C.F.? Apparently its x=cos(wt)+sin(wt) ... | 5 | [
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0.0035400... | 1,473 | 1473 | |
Discover
A Beautiful Equilibrium
The mathematics of John Forbes Nash
He who goes first . . .
Ticktacktoe is easy to analyze. If both players play perfectly, then the game ends in a draw. Chess is harder. But if we could play through every possible game, we could figure out which player can
force a win or at least a ... | 5 | [
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0.010620... | 1,474 | 1474 | |
Homework Help
Posted by Jen on Monday, September 11, 2006 at 4:54pm.
An elevator cab in NY Marriott has a total run of 190 m . IT's max speed is 305m/min Its acceleration and deceleration both have a magnitude of 1.22m/s^2
a) how far does teh cab move while accelerating to full speed from rest?
b) How long does it t... | 4 | [
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Diffusion Thermoeffect Measurements of Heats of Transport in Ternary Liquid Toluene Chlorobenzene Bromobenzene Mixtures at 25degreesC and 3degreesC :: Institutional Repository
Diffusion thermoeffect measurements of heats of transport
in ternary liquid toluene-chlorobenzene-bromobenzene
mixtures at 250 and... | 4 | [
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-0.044433... | 1,476 | 1476 | |
Homework Help
Posted by Bubba on Monday, August 23, 2010 at 6:18pm.
2x + 3y is less than or equal to 6
solve b=6c for c
The length of a rectangle is fixed at 15cm. What widths will make the perimeter greater than 80 cm?
solve the compound inequality:
6>-5x + 5 or 10 is less than or equal to -5x+4
• algebra - He... | 4 | [
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... | 1,477 | 1477 | |
factorial help!!!
Posted by tiffanie robinson on Wednesday, August 31, 2005 at 6:00pm.
i just need help with factorials
I assume you know what a factorial is:
1! = 1
2! = 1x2 = 2
3! = 1x2x3 = 6
N! = 1x2x3x...x(N-1)xN
They occur often in probability theory.
Please ask a more specific question about factorials. I... | 4 | [
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I need help with a Guass Jordan elimination problem
3 8 -1 :-18 2 1 5 : 8 2 4 2 :-4
$A=\left[\begin{array}{ccc|c} 3 & 8 & -1 & -18 \\ 2 & 1 & 5 & 8 \\ 2 & 4 & 2 & -4 \end{array}\right]$ $A_{\begin{array}{l} r_1\leftrightarrow\frac{1}{2}r_3 \end{array}}=\left[\begin{array}{ccc|c} 1 &
2 & 1 & -2 \\ 2 & 1 & 5 & 8 \\ 3 & ... | 5 | [
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... | 1,479 | 1479 | |
The Discriminant: Applications
We can identify integral bases using the discriminant. Let $\alpha_1,...,\alpha_n \in R$. Then they form an integral basis for $R$ if and only if $disc(\alpha_1,...,\alpha_n) = disc(R)$.
We may also prove that $\mathbb{Z}[\omega]$ is the number ring of $\mathbb{Q}[\omega]$ for $\omega =... | 4 | [
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0.067... | 1,480 | 1480 | |
Math Help
December 9th 2007, 09:31 PM #1
Newbie
Joined
Dec 2007
Posts
16
Ode
Find a general sol'n for the following ODE:
$y''-6y'+9y=2+te^{4t}$
So I use the auxiliary eq:
m^2 - 6m + 9 = 0
m = 3.
So, the homogeneous sol'n, y_c, is:
$y_c = c_1e^{3t}$
How'd I complete it?... | 5 | [
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Probability and Probability Distributions
This file is part of a program based on the Bio 4835 Biostatistics class taught at Kean University in Union, New Jersey. The course uses the following text:
Daniel, W. W. 1999. Biostatistics: a fou... | 5 | [
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Homework Help
Posted by Erin on Monday, November 9, 2009 at 9:15pm.
I'm not sure how to factor 3x^3-12x^2+3x. I tried separatring the 3x so that 3x(x+1)(x-4, but I got -3x^3+-12x^2-3x^2+12x. Can you show me where I went wrong and how to properly factor this? Is there
a general rule or tip for this sort of factoring wi... | 4 | [
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Related Rates Questions
March 24th 2008, 12:38 AM
a.a
Related Rates Questions
A spherical ballon is being inflated at a rate of 3 pi m^3/min. Twelve minutes after inflation first begins, what is the rate of increase of the diameter?
i solved for dr/dt and then adjuster for diameter, but i dont understand wh... | 5 | [
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Homework Help
Posted by Krissy on Wednesday, January 16, 2013 at 10:04am.
I posed these one's before but added parenthesis which I think made it confusing as the actually questions do not have them. So, I'm reposting them without to see if it makes sense. If not I
understand.
1. Compute as indicated. Write your answe... | 4 | [
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Binomial theorem check
May 18th 2010, 09:31 PM #1
Super Member
Joined
Oct 2007
From
Santiago
Posts
517
Binomial theorem check
hey guys, just need to check if my working out and solution is correct.
Find the coefficient of $x^5$ in $(x^4 + 4)(3x-4)^9$
My solution
So I started off by sep... | 4 | [
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Null Hypothesis Significance Testing: The Fault in Our Stars
[...] The same is true on amazon, where the book’s average rating has actually gone up a bit in the past six months (although not in a statistically significant way). [...]
Actually, the ratings have decreased in a statistically significant way (alpha < ... | 4 | [
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... | 1,487 | 1487 | |
Linear equation
February 2nd 2008, 06:15 PM #1
Newbie
Joined
Feb 2008
Posts
8
Linear equation
Hey hopefully some one can help me with this cuase i cant get it for the life of me
solve for 'x'
b-cx over a + a -cx over b + 2 = 0
also im new so i dont know how to get all signs and stuff lol
... | 4 | [
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ax+b=e^(cx)
January 23rd 2010, 08:23 PM
youngidealist
ax+b=e^(cx)
I ran into this problem at the end of a differential equation problem on interest. If I ever learned to solve such a problem I am drawing a complete blank.
Specifically the part I'm stuck at is:
500r + 1 = e^(40r), solve for r
January 2... | 5 | [
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Math (PreAlgebra) 8thG
Posted by LovelyDec0y on Monday, February 18, 2013 at 2:01pm.
Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number.
V = (4/3)3.14(r)^3 = (formula)
I don't know what to do about the fraction, four over three (4/3), in the formula.... Show me how to do this ple... | 4 | [
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Homework Help
Posted by aliya on Tuesday, May 15, 2012 at 3:30pm.
the boys of a school can be arranged in 12,15. and 18 equal rows and also into a a solid square.What is the least number of boys the school can have?
• maths - Steve, Tuesday, May 15, 2012 at 5:10pm
12 = 2^2 * 3
15 = 3 * 5
18 = 2 * 3^2
... | 4 | [
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Connell-Like Sequence
Journal of Integer Sequences, Vol. 1 (1998), Article 98.1.4
A Connell-Like Sequence
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Quick one regardin Cos^2... (Needed for integration)
July 3rd 2010, 02:18 AM #1
Member
Joined
Sep 2009
Posts
87
Quick one regardin Cos^2... (Needed for integration)
Is:
$COS^2(5u)$
The same as:
$COS(5u) * COS(5u)$
I am having real problems with double angle formulas and integration.
... | 5 | [
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Homework Help
Posted by Jon on Saturday, March 1, 2008 at 1:19pm.
The shape of a supporting arch can be modeled by h(x)= -0.03^2+3x, where h(x) represents the height of the arch and x represents the horizontal distance from one end of the base of the arch in
meters. Find the maximum height of the arch.
• Algebra II... | 4 | [
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Thermodynamics: Gas
Fermi Gas
A Fermi gas is a gas consisting of fermions. We will investigate a few of its properties and applications here.
Fermi-Dirac Distribution Function
Consider a system that is a single orbital for a fermion. Remember that only 0 or 1 fermions may be in the orbital. The Gibbs sum is easy to ... | 4 | [
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Gravitation: Potential
Gravitational Potential Energy
If gravity moves an object it does work on that object. However, the amount of work done does not depend on the path over which gravity acted, but rather on the initial and final positions of the
object. This means that gravity is a conservative force. We can sketc... | 4 | [
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SparkNotes: SAT Subject Test: Math Level 1: Exponents
4.1 Order of Operations 4.8 Exponents
4.2 Numbers 4.9 Roots and Radicals
4.3 Factors 4.10 Scientific Notation
4.4 Multiples 4.11 Logarithms
4.5 Fractions 4.12 Review Questions
4.6 Decimals 4.13 Exp... | 4 | [
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transpose and symmetry
June 23rd 2009, 02:35 PM #1
Member
Joined
Oct 2007
Posts
89
transpose and symmetry
Prove if (transpose of A)*A = A, then A is symmetric and A = A^2:
I think I understand it, but Im not sure if I can put it into proper terms
Since the transpose of A = A (if symmetric), the... | 5 | [
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Re: st: How do I graph prediction of mean growth trajectory?
Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][... | 5 | [
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