content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Projective planes that contain the Fano plane
up vote 4 down vote favorite
I am interested in the following question:
Given a projective plane of order $n=2^a$, is its incidence matrix must contain the incidence matrix of the Fano plane? If not, is it true that for any $n$ of the form $n=2^a$ there exists a
projectiv... | 5 | [
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0.021728515625,
0.09912109375,
0.0174560546875,
0.0291748046875,
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0.025390625,
0.049560546875,
-0.01953125,
-0.0424... | 45,700 | 45700 | |
Number Theory GCD Linear Combination
July 13th 2008, 05:33 PM #1
Junior Member
Joined
Jun 2008
Posts
27
Number Theory GCD Linear Combination
Hi again (as you can tell, I've been working on this stuff all day, sorry for posting so much!)
Right now I'm working on a Linear Combinations problem.
He... | 4 | [
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Linear Programming Problem!!
March 13th 2008, 01:41 PM #1
Newbie
Joined
Oct 2007
Posts
18
Linear Programming Problem!!
Consider the following linear programming problem:
Maximise Z = 100x1 + 200x2
Subject to 3x1 + 2x2 ≤ 120
x1 + 4x2 ≤ 80
2x1 + x2 ≤ 100
x1, x2 ≥ 0
Solution is Z=... | 4 | [
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Real Numbers
Date: 08/08/97 at 14:36:30
From: Hari Seldon
Subject: Real numbers
What exactly is a real number? When I first started algebra, I used
them all the time, because they were the only numbers I knew. Then I
learned about complex numbers, and how they could be used in various
ways. Then I learned about thin... | 4 | [
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0.0... | 45,703 | 45703 | |
Find the basis and it's dimension
May 3rd 2009, 10:22 AM
orendacl
Find the basis and it's dimension
Find a basis for
W = {|a b|
_____|c d|
:a+d=b+c} and state the dimension of W.
Showing my work:
I thought one way to solve this would be to exhange values in the matrix:
Then establish ... | 5 | [
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0.0625,
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0.0305175... | 45,704 | 45704 | |
SCIENTIFIC NOTATION REVIEW
Do you know this number, 300,000,000 m/sec.? It's the Speed of light !
Do you recognize this number, 0.000 000 000 753 kg. ? This is the mass of a dust particle!
Scientists have developed a shorte... | 4 | [
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-0.01269531... | 45,705 | 45705 | |
Is the singular homology of a real algebraic set always finitely generated?
up vote 12 down vote favorite
2
Here is a precise statement of my question:
Let $p\in \mathbb{R}[x_1, \ldots, x_n]$ be a polynomial, and let $Z(p)\subset \mathbb{R}^n$ be the set of zeros of $p$. Must the singular homology $H_i (Z(p); \mathbb... | 4 | [
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-0.09375,
-0.03271... | 45,706 | 45706 | |
Homework Help
Posted by Chanell on Sunday, April 10, 2011 at 4:21pm.
if x+y=11, y+z=14, and x+z=13, what is the value of x+y+z ?
• geometry - Henry, Tuesday, April 12, 2011 at 2:41pm
Eq1: X + Y = 11.
Eq2: Y + Z = 14.
Y = 14 - Z.
Eq3: X + Z = 13.
X = 13 - Z.
In Eq1, substitute (13-Z) for ... | 4 | [
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0.0086059... | 45,707 | 45707 | |
They never saw it coming
Issue 33
January 2005
Motion camouflaging and nature's stealth fighters
The word "stealth" is often associated with high-tech bombers built to be invisible to enemy radar. This technology works through the aircraft's surface being specially designed and having a covering
of radar-absorbent ... | 4 | [
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0.050048828125,
-0.0461... | 45,708 | 45708 | |
Homework Help
Posted by Blegh on Saturday, November 3, 2012 at 2:29pm.
We guess, based on historical data, that 30% of graduating high-school seniors in a large city will have completed a first-year calculus course. What's the minimum sample size needed to construct a
95% confidence interval for a proportion with a ma... | 4 | [
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... | 45,709 | 45709 | |
Math Forum Discussions
Virgil
Posts: 9,012
Registered: 1/6/11
Re: Distinguishability of paths of the Infinite Binary tree???
Posted: Dec 29, 2012 2:21 AM
In article
<577c1bed-657f-4aa2-a66c-9d8f225fdcff@gu9g2000vbb.googlegroups.com>,
Zuhair <zaljohar@gmail.com> wrote:
> On Dec 29, 4:06 am, Virgil <vir...@ligriv.com>... | 4 | [
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Number of functions
October 22nd 2008, 11:34 AM #1
Number of functions
Let S={1,2,3,4}. Find the number of functions $f: S \to S$ such that $f(f(x)) = 1$ for all $x \in S$.
Last edited by alexmahone; October 23rd 2008 at 03:34 AM.
Last edited by Moo; October 22nd 2008 at 12:28 PM.
And also:
$f:... | 5 | [
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Homework Help
Posted by sierra on Monday, April 23, 2007 at 1:16pm.
Need help solving problems using the Trigonometric Identities: 8cos^4 thet=cos4theta+4cos2theta+3
I am a bit unsure how to solve it. I am aware that the first step I must take is to simplify the problem and then use the Product to Sum formula
Nasty ... | 4 | [
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... | 45,712 | 45712 | |
Math Help
Square both sides: $(x^2 - 16)^2 = (2x-1)^2$ $x^4 - 32x^2 + 256 = 4x^2 - 4x + 1$ $x^4 - 36x^2 + 4x + 255 = 0$ You now need to solve this. If you can picture the graphs, you'll know that there is one
solution (the most positive) when equating $x^2 - 16 = 2x - 1$ $x^2 - 2x - 15 = 0$ $(x-5)(x+3) = 0$ So, (x-5) ... | 4 | [
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What prevents a cover to be Galois?
up vote 8 down vote favorite
4
Let $f:X\rightarrow Y$ be a ramified cover of Riemann surfaces or algebraic curves over $\mathbb{C}$. My question is can one in terms of the ramification data of $f$, determine whether the cover is
Galois or not. I am Specially interested in the follow... | 4 | [
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FP2 - question on simultaneous equations
August 14th 2009, 10:37 AM
pepsi
FP2 - question on simultaneous equations
Posted on Friday, 14 August, 2009 - 06:24 pm:
hi..thanks
Question: Find the two values of k for which the equations
(1) 6x + 3y = 9
(2) kx + 8y = 6
do not have a unique soluti... | 4 | [
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Randomly Cutting a Rope into Two Segments
Date: 05/14/98 at 20:12:26
From: William Luh
Subject: Probability of cutting ropes
A rope 20m long is randomly cut into two segments, each of which is
used to form the perimeter of a square.
(a) Find the probability that the larger square has an area greater
than ... | 5 | [
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help with integral
August 7th 2009, 07:08 AM #1
Newbie
Joined
Aug 2009
Posts
1
help with integral
hey guys,
I need to prove that the following integral converges
int ( sqrt(x) * cos(x^2) dx , x = 0 to infinity )
Using Wolfram I found that the solution can be expressed in the closed form
... | 4 | [
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-0... | 45,717 | 45717 | |
Can anyone solve me this maths equation, please?
January 19th 2009, 01:29 AM
lewuk09
Can anyone solve me this maths equation, please?
V = 240 ( 1 - e -(rt)L )
given R = 1 ohm
given L = 200mH
calculate the time when the voltage is expected to be 140v
been trying for ages just cant crack it
Janu... | 4 | [
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... | 45,718 | 45718 | |
How do you solve for x when 2sin(2x-60°)=1?
April 7th 2009, 08:43 PM #1
Newbie
Joined
Apr 2009
Posts
12
How do you solve for x when 2sin(2x-60°)=1?
How do you solve for x for this equation: 2sin(2x-60°)=1?
where -2π ≤ x ≤ 2π
[π=pi]
I am unsure of where to start for this one
$2 \sin (2... | 4 | [
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units/ones digit
August 2nd 2010, 10:30 AM #1
units/ones digit
Hi all,
if given a number like $56^{34}$, how would I find the units digit without multiplying the number out? What about for expressions such as $(867)\times (563)\times (y-2)$?
What is the method?
We are interested in 56^34 (mod 10). ... | 5 | [
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Problem with inequalities
Well, I'm not done yet. Am I on the right track? $\sqrt{x^2-9x+20}\leq\sqrt{x-1}\leq\sqrt{x^2-13}$ $x^2-9x+20\leq{x-1}$ $x-1\leq{x^2-13}$ $x^2-10x+21\leq{0}$ $0\leq{x^2-x-12}$ $(x-7)(x-3)\leq{0}$ $0\
leq{(x-4)(x+3)}$
Hi Nathan02079! Are you supposed to be solving the inequality for x? Or just... | 4 | [
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Very Basic Number Help please...
October 6th 2012, 08:42 AM #1
Newbie
Joined
Oct 2012
From
London, England
Posts
3
Very Basic Number Help please...
Hi,
I am new to this forum and really really hoping you can help me! I am only university age (in the UK) but with an A Level in Maths, I spend some... | 4 | [
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Linear Approximation of 3cos^2(3) to estimate the value of |cos(3)
May 13th 2011, 07:08 PM #1
Junior Member
Joined
Apr 2011
Posts
68
Linear Approximation of 3cos^2(3) to estimate the value of |cos(3)
hey guys can you help me with this:
Use a linear approximation of 3cos^2(3) to estimate the value of... | 5 | [
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number theory
number theory
It is one of the oldest parts of mathematics, alongside geometry, and has been studied at least since the ancient Mesopotamians and Egyptians. Perhaps because of its purely mathematical nature (at
least until the development of cryptography and cryptanalysis in the twentieth century, numbe... | 5 | [
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0.016... | 45,724 | 45724 | |
Extending a partial order while preserving an automorphism
up vote 9 down vote favorite
2
It is well known that if $(P, \leq)$ is a partial order then $\leq$ can always be extended to a linear order. This is sometimes called Szpilrajn´s theorem although it had been previously proved by
Banach, Kuratowski and Tarski.
... | 5 | [
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Thermo/Stat Mech Power Page
MAPLE/Mathematica/Spreadsheet Resources
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┃ For a start ... ... | 4 | [
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0.026611328125,
-0.049072265625,
0.0032196044921875,
0.00799560546875,
-0.05224609375,
... | 45,726 | 45726 | |
integration: by parts
July 11th 2007, 06:33 AM
^_^Engineer_Adam^_^
integration: by parts
$\int e^x(\cos{x})dx$
substituted it to
dv = e^(x) dx
v = e^(x)
u = (cos(x))
u = -sin(x) dx
and this one goes infinity for me
help needed for what to sub ... i dunno how the integrator got a s... | 5 | [
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-0.0361328125,
0.05224609375,
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0.05810546875,
... | 45,727 | 45727 | |
What Does Negative Temperature Mean?
[Physics FAQ] - [Copyright]
Original by Scott I. Chase.
Below Absolute Zero—What Does Negative Temperature Mean?
Questions: What is negative temperature? Can you really make a system that has a temperature below absolute zero? Can you even give any useful meaning to the expressi... | 4 | [
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unbounded complexity
up vote 1 down vote favorite
If a language L is decidable, does that imply that the is a computable function f such that L is in O(f(n)) ?
For example what would be the complexity class of the language of "provably halting Turing machines that halt in an even number of steps"
computational-compl... | 5 | [
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some electrostatics questions
September 7th 2010, 09:20 PM #1
Member
Joined
Mar 2008
From
???
Posts
169
some electrostatics questions
these are some questions which I coudnt get
Q1 :
A thick shell with inner radius R and outer radius 3R has uniform volume charge density ''sigma" it has a sph... | 4 | [
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0.060546875,
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0.1015625,
0.026611328125,
0.019287109375,
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-0.10009765625,
-0.0... | 45,730 | 45730 | |
simple calculus question
August 15th 2012, 07:57 AM
farhadb
simple calculus question
Hi guys,
I have a simple calculus question, (so simple it's actually embarrassing(Worried))
So I'm reading this article that says:
$\mbox{if we have: } p(D_i,D_i^* \mid \Psi) = \frac{1}{4w_i} sech^2(\frac{D_i^* - D_... | 5 | [
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0.11962890625,
-0.025... | 45,731 | 45731 | |
Another center of mass problem
July 7th 2009, 02:29 AM #1
Another center of mass problem
Hi!
Attached picture below.
Problem: Calcuate center of mass of the slender rod.
Solution attempt:
Since the density varies, I did: With $dm = \rho \cdot A \cdot dx$ , because I guess the area is the same ... | 5 | [
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... | 45,732 | 45732 | |
Fibonacci sequence induction proof
October 1st 2010, 08:46 AM #1
Newbie
Joined
Oct 2010
Posts
3
Fibonacci sequence induction proof
Hi!
I have a assignment involving the fibonacci sequence, and I wonder if anyone could give me a hand with it:
The fibonacci sequence is given as:
$f_{n} = f_{n-1... | 4 | [
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s theorem
L\"ob's theorem
Löb’s theorem
Löb’s theorem
In this short article we will provide an example where one’s intuition can be faulty, and that strict formalization is always needed when one does mathematics in order to avoid possible hidden
intuitive inconsistencies. A striking example is the erroneous but int... | 5 | [
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0.... | 45,734 | 45734 | |
The Intermediate Value Theorem
Date: 09/14/98 at 05:42:14
From: BOOK
Subject: Intermediate Value Theorem
I don't understand about the "Intermediate Value Theorem" at all. Can
you please explain it to me? Also for the function:
f(x) = 1/(x-3) + 2, x not equal to 3
verify that f(0) < f(5), find the value of f(... | 5 | [
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... | 45,735 | 45735 | |
Vector Spaces
Date: 06/11/99 at 00:04:19
From: Brian Reid
Subject: Vector spaces
Is V = {(x,y) in R^2 | y = 3x+1} a vector space if addition and
multiplication by a scalar are defined by:
(x,y) + (x',y') = (x+x',y+y'-1)
k(x,y) = (kx,k(y-1)+1)
Part (b): give reasons for your answer in (a).
My son is taking m... | 4 | [
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0.02819824... | 45,736 | 45736 | |
Homework Help
Posted by rachel on Monday, November 21, 2011 at 9:41pm.
solve by substitution.
0.5x+0.25y=36
y+18=16x
• algebra 1 - Anonymous, Tuesday, November 22, 2011 at 8:59am
y + 18 = 16 x
y = 16 x - 18
______________
0.5 x + 0.25 y = 36
x / 2 + y / 4 = 36 Multiply both sides with... | 4 | [
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0... | 45,737 | 45737 | |
Reflection of light
June 4th 2013, 05:44 AM #1
Newbie
Joined
Jun 2013
From
Zurich
Posts
2
Reflection of light
I have the following problem that i have to solve:
A light ray emitted from Point A is reflected at a mirror and then passes through the Point B.
The plane of the mirror is given by ... | 5 | [
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Group Velocity vs Phase Velocity
When we left off, I told you I had come up against a paradox when applying the principle of least action to the trajectory of an electron. I started by doing it for baseballs. But I didn't do what
Feynman does, where he minimizes the action between the starting and ending point. I assum... | 4 | [
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... | 45,739 | 45739 | |
Linear Density
April 2nd 2006, 09:30 AM #1
Super Member
Joined
Mar 2006
Posts
705
Thanks
2
Linear Density
I came across this problem just now:
The mass of the part of a rod that lies between its left end and a point x meters to the right is 5x^{2} kg. The linear density of the rod at 8 meters is... | 5 | [
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0.05761718... | 45,740 | 45740 | |
Hide and seek on a spherical planet
August 23rd 2010, 07:50 AM #1
Junior Member
Joined
Jul 2010
Posts
52
Hide and seek on a spherical planet
A single inhabinant lives on a surface of a spherical planet on which he can move freely with velocity u. A spaceship approaches the planet with velocity v. Show th... | 5 | [
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... | 45,741 | 45741 | |
Question on canceling fractional quantities
October 3rd 2012, 08:17 AM #1
Member
Joined
Jul 2012
From
United States
Posts
87
Thanks
3
Question on canceling fractional quantities
This is more of an algebra question than calculus, but it involves derivatives so I thought I'd post it here.
I ha... | 4 | [
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0.07763671... | 45,742 | 45742 | |
Proving integers?
September 1st 2012, 04:55 AM #1
Newbie
Joined
Aug 2012
From
here and there
Posts
4
Proving integers?
Let n>1 be an integer. Prove that φ (n) | n if and only if n is of the form 2^a 3^b where a≥1 and b≥0 are integers.
Re: Proving integers?
$\varphi(2^a3^b)=2^a3^{b-1} | 2^a3^b$
... | 5 | [
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The (Not So) Simple Pendulum
Posted by:
Ron D.
in
clocks
Pendulums are the defining feature of pendulum clocks, of course, but today they don’t elicit much thought. Most modern “pendulum” clocks simply drive the pendulum to provide a historical look, but a
great deal of ingenuity originally went into their desi... | 4 | [
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0.07714843... | 45,744 | 45744 | |
Related Rates Problems
October 30th 2007, 05:23 PM #1
Related Rates Problems
1. A spotlight on the ground shines on the wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed of 1.6 m/s, how fast is the length of his shadow on the
building decreasing when he is 4 m from the ... | 5 | [
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question on using derivative to find orginal problem
March 15th 2007, 05:37 PM #1
Junior Member
Joined
Mar 2007
Posts
37
question on using derivative to find orginal problem
If you have a third degree polynomial such that Q(1) = 1 Q'(1)=3 Q''(1) = 6 and Q'''(1)=12 what is the original polynomial? Is ther... | 5 | [
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... | 45,746 | 45746 | |
Help with using the quotient rule on a derivative?
May 31st 2010, 05:16 PM #1
Newbie
Joined
May 2010
Posts
11
Help with using the quotient rule on a derivative?
I don't know why, but for some reason I absolutely cannot get the answer to this derivative:
h(x) = sqrt(x)/x^3+1
I got as far as writ... | 4 | [
-0.0390625,
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0.03125,
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0.01190185546875,
-0... | 45,747 | 45747 | |
Are these two integral answers equivalent?
June 30th 2013, 09:11 AM
wondering
Are these two integral answers equivalent?
$\int sec^2xtanxdx$
I let u=tanx
du=sec^2xdx
$\int udu$
$\frac{u^2}{2} + C$
$\frac{1}{2}tan^2x + C$
The answer key let u=sec^2x
Their answer is
$\frac{1}{2}se... | 5 | [
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0.01... | 45,748 | 45748 | |
proving identities
please i need help with this problem. cosB/1-tanB + sinB/1-cotB = sinB + cosB how can i prove this identity?
working on the left side ... $\frac{\cos{\beta}}{\cos{\beta}} \cdot \frac{\cos{\beta}}{1-\tan{\beta}} + \frac{\sin{\beta}}{\sin{\beta}} \cdot \frac{\sin{\beta}}{1-\cot{\beta}}$ $\frac{\cos^2{... | 4 | [
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0.032714843... | 45,749 | 45749 | |
Compute the Limit: Question 3
September 24th 2011, 08:22 PM
sparky
Compute the Limit: Question 3
Is the following correct?
$\text{Calculate } \lim_{x \rightarrow -1 } \frac{\sqrt{x^2+8}-3}{x+1}$
$= \lim_{x \rightarrow -1 } \frac{\sqrt{x^2+8}-3}{x+1 } \cdot \frac{\sqrt{x^2+8}+3}{\sqrt{x^2+8}+3}$
$... | 4 | [
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Why Heisenberg can't stop atomic collapse
TL;DR
A heuristic argument to show that hydrogen atoms are stable and have a minimum energy level is wrong. I will assume undergraduate level quantum mechanics in the discussion.
Introduction
There's a popular argument used to explain why atoms are stable. It shows there is ... | 4 | [
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0.... | 45,751 | 45751 | |
Help understanding what this theorem means
March 29th 2011, 04:35 PM
paupsers
Help understanding what this theorem means
Theorem. If $p$ is a prime and $(a,p)=1$, then the congruence $x^n$$\equiv$$a (mod p)$ has $(n, p-1)$ solutions or no solution according as
$a^{(p-1)/(n,p-1)} \equiv 1 (mod p)$
or not.... | 4 | [
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-... | 45,752 | 45752 | |
Newton-Raphson Method
Date: 06/24/2009 at 10:17:12
From: William
Subject: Failure of Newton-Raphson
Are there any equations that cannot be solved using the Newton-Raphson
method (irrespective of the initial estimate)? I thought
0 = arctan(x) might not be solvable but one just needs to choose an
initial value within ... | 5 | [
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-0.01141357421875,
-0.0303955078125,
-0... | 45,753 | 45753 | |
Field Extensions
March 16th 2006, 08:16 AM
DMT
Field Extensions
Say:
$\alpha = \sqrt{2 + \sqrt{2}}$
And let:
$\beta = \sqrt{2 - \sqrt{2}}$
How do I show that $\beta$ is an element of the field extension:
$Q(\alpha):Q$
(the problem is to show that this field extension is normal, whic... | 5 | [
0.06201171875,
0.0272216796875,
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-0.014770507812... | 45,754 | 45754 | |
Evaluate the Integral
March 8th 2009, 06:53 PM #1
Newbie
Joined
Mar 2009
Posts
20
Evaluate the Integral
∫sin³(x/2) from 0 to pi/3.
I have..
∫sin²(x/2)sin(x/2)
∫[1-cos²(x/2)]sin(x/2)
∫sin(x/2) - cos²(x/2)sin(x/2)
∫sin(x/2) - ∫cos²(x/2)sin(x/2)
I don't know where to go from there... | 5 | [
-0.04736328125,
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0.06494140625,
-0.055908203... | 45,755 | 45755 | |
compact surfaces question
May 11th 2013, 11:28 AM #1
Newbie
Joined
Dec 2012
From
Los Angeles
Posts
12
compact surfaces question
Let M be a closed, orientable, and bounded surface in R3
a) Prove that the Gauss map on M is surjective
b) Let K[+](p)= max{0, K(p)} Show that the integral over the ... | 5 | [
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0.00506591796875,
-0.004730224609375,... | 45,756 | 45756 | |
Homework Help
Posted by Kenzie on Monday, November 5, 2012 at 11:52pm.
3x-1/x^2-10x+26
Find all (real) zeros of the function
Find all (real) poles of the function
The function has...
A horizontal asymptote at 0?
A non-zero horizontal asymptote?
A slant asymptote?
None of the above
• College Algebra - Reiny, ... | 4 | [
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-0.052978515625,
-0.007446289062... | 45,757 | 45757 | |
Order of Operations - GMAT Math Study Guide
Definitions
• Order of Operations - The sequence (or order) by which computations (or operations) are performed on an expression, term, equation, etc.
Order of Operations
The order of operations refers to the order in which fundamental mathematical operations must be do... | 4 | [
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0.0400390625,
... | 45,758 | 45758 | |
Domain and Range of x^x
Date: 08/24/98 at 21:19:37
From: Larry
Subject: Domain and range
What is the domain and range of x^x?
Date: 08/24/98 at 23:15:02
From: Doctor Jaffee
Subject: Re: Domain and range
Hi Larry,
The value of x can't be 0, because 0^0 is undefined. Consequently, y
can't be 0 either because the o... | 4 | [
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0.032470703125,
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0... | 45,759 | 45759 | |
Lower bound on the dimension of a subspace of $\mathbb Z_2^r$?
up vote 4 down vote favorite
This question may be very trivial, I apologize if it is so.
I have subspace $V\subset \mathbb Z_2^r$ with the property that for every choice of a subset $I$ of $k$ elements in $\{1,2,\dots r\}$, the projection of $V$ onto the... | 5 | [
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0.052490234375,
0.03... | 45,760 | 45760 | |
Showing a parametric equation is smooth?
April 22nd 2008, 09:01 AM #1
Newbie
Joined
Apr 2008
Posts
4
A parametric equation, say r(t), is smoothly parametrized if:
1. its derivative is continuous, and
2. its derivative does not equal zero for all t in the domain of r.
Now that sounds simple e... | 5 | [
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0.07421875,
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0.0123291015625,
-0.0717... | 45,761 | 45761 | |
E.W.Dijkstra Archive: A somewhat open letter to Uri Leron (EWD 1049)
A somewhat open letter to Uri Leron
Dear Colleague,
you end your letter of March 30, 1989, with:
“I finish with a puzzle, that somehow seems to me related to your Sylvester's theorem (EWD1016). Consider two finite, equinumerous sets of points in th... | 4 | [
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... | 45,762 | 45762 | |
Matrix eqn
April 9th 2008, 10:59 AM #1
Junior Member
Joined
Feb 2008
Posts
61
Matrix eqn
Matrix A = (3 -5 1 -1
4 -1 2 0
0 2 -1 -1
3 0 -3 1)
Express A as the sum of a symmetric matrix U and a skew-symmetric matrix V such that A = U+V
Two unkowns in this Q? How can i solve this?
... | 4 | [
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F test
Talk0
34,135pages on
this wiki
Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |
Statistics: Scientific method · Re... | 4 | [
0.1103515625,
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... | 45,764 | 45764 | |
How many permutations are there?
March 22nd 2010, 02:16 PM #1
Junior Member
Joined
Jan 2010
Posts
50
The English alphabet has 26 letters, 5 of these are vowels.
How many permutations of English letters are there in which all vowels are in consecutive places?
My answer:
There are C(26,5) + C(2... | 4 | [
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0.01080322265625,
-0.09814453125,
-0.053710937... | 45,765 | 45765 | |
Parabolic induction for GL(2,Z/pn)
up vote 2 down vote favorite
1
Fix a finite extension $F$ of $\mathbb{Q}_p$. Consider its ring of integers $\mathfrak{o}$ with maximal ideal $\mathfrak{p}$. Set $R_n = \mathfrak{o}/\mathfrak{p}^n$. Let $\mathrm{B}$ be the upper
triangular matrices. Consider a character $\mu : \mathrm... | 4 | [
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0.07421875,
-0.031982421875,
-0.01324... | 45,766 | 45766 | |
Convergence of power series
March 28th 2011, 05:30 PM #1
Junior Member
Joined
Feb 2010
Posts
42
Convergence of power series
basic complex analysis (so z is complex):
Prove that the power series $\sum_{k=0}^{\infty} z^{k}$ converges at no point on its circle of convergence |z| = 1
Attempt:
... | 4 | [
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-0.0306396484375,
-0.053955... | 45,767 | 45767 | |
Ambiguity in probability questions
February 26th 2013, 06:26 PM
Paze
Ambiguity in probability questions
I feel that many probability questions are very ambiguous concerning the choice of words. For example:
In a talent show there are 12 contestants. The judges will choose 5 contestants and place them in the... | 4 | [
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-0.04028320312... | 45,768 | 45768 | |
Minima problem
April 4th 2009, 06:11 AM #1
Member
Joined
Nov 2008
Posts
171
Minima problem
THe number of minima of the polynomial 10 x^6 - 24 x^5 + 15 x^4 + 40 x^2 + 108 is ?
(I took derivative and found a polynomial of degree 5. But making its roots and then testing each one for minima is going to ... | 5 | [
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0.0027923583984375,
0.03125,
-0.024658203125,
-0.0194091796875,
-0.02648... | 45,769 | 45769 | |
Covering problem (board and dominoes)
September 28th 2010, 08:48 AM
doug
Covering problem (board and dominoes)
We cut off some squares from the bottom row (rank) of a 2k x 2k board. We should prove that we can cover the board with 2 x 1 dominoes if and only if the number of the cut black and white squares
ar... | 4 | [
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0.04858398... | 45,770 | 45770 | |
Electrical Engineering Archive | November 19, 2011 | Chegg.com
Electrical Engineering Archive: Questions from November 19, 2011
• Anonymous asked
1 answer
• Anonymous asked
1 answer
• Anonymous asked
1 answer
• Anonymous asked
1 answer
• Anonymous asked
1 answer
• Anonymous as... | 4 | [
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0.00101... | 45,771 | 45771 | |
Cofactors, adj, 2x2 matrix
February 26th 2010, 04:58 PM #1
Cofactors, adj, 2x2 matrix
I really need some clarification about cofactors and adj of a 2x2 matrix
say the matrix is
a b
c d
what would the cofactors be?
what would the adj be?
this is what i think but for some reason i think... | 4 | [
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0.002655029296875,
0.0566406... | 45,772 | 45772 | |
Please help with optimization problem
April 11th 2008, 02:50 PM #1
Newbie
Joined
Mar 2008
Posts
17
Please help with optimization problem
If 2100 square centimeters of material is available to make a box with a square base and an open top, find the largest possible volume of the box.
First find an eq... | 4 | [
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0.054443359375,
-0... | 45,773 | 45773 | |
Graphs where every two vertices have odd number of mutual neighbours
up vote 9 down vote favorite
2
There was a rather cute question last week about graphs where every pair of distinct vertices has an odd number of mutual neighbours.
The question was to show that such a graph must have an odd number of vertices, and ... | 4 | [
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-0.0022430419921875,
-0.06933593... | 45,774 | 45774 | |
Math Help
November 3rd 2008, 08:03 PM #1
Member
Joined
Aug 2008
Posts
225
Sequences
A_n = (1 + (3/n) )^4n
I don't know hot to find if this converges. I feel like I should break up the exponent, but I don't know how that would help.
This uses a couple of neat tricks.
Let this limit equal A... | 5 | [
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0.0296630859375,
-0.044921875,
-0.025390625,
... | 45,775 | 45775 | |
Curves which do not dominate other curves
up vote 13 down vote favorite
3
Let $g>1$ be an integer. Does there exist a (smooth projective) genus g curve $X$ which doesn`t dominate a curve of positive genus and genus smaller than $g$?
Surely such curves exist. Just take a curve with simple jacobian.
I`m wondering whet... | 5 | [
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-0.046630859375,
-0.044189453... | 45,776 | 45776 | |
how to solve this?
Solve: y''=yy'/x And show that y=c3 is a solution of the problem too. where y'=dy/dx How to solve it?
The second question is easy: if y is a constant, then both y' and y'' are 0 so the equation becomes 0= 0.
Well I have a stab at it that might lead somewhere. But I can't finish it. Perhaps it will ... | 5 | [
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0.0308837890625,
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... | 45,777 | 45777 | |
Global Spec and Vector Bundles
up vote 0 down vote favorite
Can anybody explain why the vector bundle corresponding to a locally free sheaf F is global spec of sym of the dual of F and not just F? How does a section get identified with a polynomial in the
dual?
ag.algebraic-geometry
See en.wikipedia.org/wiki/S... | 4 | [
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integral closures in separable extensions are finitely generated
integral closures in separable extensions are finitely generated
Theorem 1.
Let $B$ be an integrally closed Noetherian domain with field of fractions $K$. Let $L$ be a finite separable extension of $K$, and let $A$ be the integral closure of $B$ in $L$... | 5 | [
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0.026977... | 45,779 | 45779 | |
Pn(x) Polynomial fitting
November 24th 2012, 09:55 PM #1
Newbie
Joined
Nov 2012
From
Malaysia
Posts
2
Pn(x) Polynomial fitting
[Hello, out there! I am Samuel.
Please, I need your assistance to fit the following set of data points with a polynomial (could be Newtons divided difference polynomial)... | 5 | [
-0.0966796875,
-0.0322265625,
0.045166015625,
-0.050048828125,
0.0286865234375,
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0.01263427734375,
0.050048828125,
-0.0830078125,
... | 45,780 | 45780 | |
Yet More Optimization
November 15th 2006, 12:46 PM
Jacobpm64
Yet More Optimization
Find the coordinates of the point on the parabola $y = x^2$ which is the closest to the point (3,0).
I'm just wondering if I did this correctly:
a point on the curve would be $(x,x^2)$
So, i found the distance betwee... | 5 | [
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0.01544189453125,
0.048828125,
-0.0607910156... | 45,781 | 45781 | |
Urgent! Need help with Differential Compound Interest Rate Problem!
November 7th 2012, 06:22 AM
jojoyce
Urgent! Need help with Differential Compound Interest Rate Problem!
I've been thinking about this problem for an hour and it's due in 2 hours!
Find the amount in a savings account after one year if the in... | 4 | [
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Subspace, Basis
February 11th 2010, 05:17 PM
millerst
Subspace, Basis
I posted a question, which I have attempted all except for c. Could someone tell me if I did the question correctly? And how do I begin (c). Thanks, there is a PDF file attached.
February 11th 2010, 07:07 PM
NonCommAlg
Quote:
in p... | 4 | [
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Are These 2 Linear Equations Correct?
November 4th 2012, 01:49 AM #1
Junior Member
Joined
Oct 2012
From
Australia
Posts
26
Are These 2 Linear Equations Correct?
The First One: 8(5-3x)-4(2+3x)=3
Expansion: -24x -12x 40-8 =3
Combine:-36x 32 =3
Shift: -36x = 3-32= -29
Solution: x= -2... | 4 | [
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Martin Ankerl
Dev102.com has a few postings about interesting job interview question. His fifth challenge is this neat task:
You are asked to sort a collection of records. The records are stored in a file on the disk, and the size of the file is much bigger than available memory you can work with. Assume a record ... | 4 | [
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Why I hate physics
In my next-to-last post on this subject, I left the question hanging in the air: how does a reaction proceed when the Gibb's Free Energy is positive? I am now going to try to answer this.
The reaction in question is the decomposition of methane in the presence of CO2:
CH4 + CO2 ===> 2CO + 2H2
As I... | 4 | [
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Isomorphism between R-{0} and C-{0}
October 14th 2011, 03:51 PM #1
Isomorphism between R-{0} and C-{0}
In the exercises of Section 1.6 Dummit and Foote (Abstract Algebra) - Exercise 4 reads as follows:
Prove that the multiplicative groups $\mathbb{R}$ - {0} and $\mathbb{C}$ - {0} are not isomorphic.
Wou... | 5 | [
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Help finding the general solution
September 16th 2010, 03:07 PM
Rhode963
Help finding the general solution
So I've got to find the general solution to the following differential equation:
$(3y^2)y' + y^3 = e^-^x$
I've been hinted that it is a problem that can be put into a form of a Bernoulli equation,... | 4 | [
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... | 45,788 | 45788 | |
Option Pricing Models
Option Pricing Models and the "Greeks"
Black-Scholes model and the Cox, Ross and Rubinstein binomial model are the primary pricing models used by the software available from this site (Finance Add-in for Excel, the Options Strategy
Evaluation Tool, and the on-line pricing calculators.)
Both mod... | 4 | [
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-0.04663... | 45,789 | 45789 | |
Completing a probability table and finding expected value.
May 5th 2010, 05:37 AM #1
Member
Joined
Mar 2010
From
Mumbai
Posts
91
Thanks
2
16. The manager of a casino plans the following game. Each player will be given a box containing five coins of which one is “gold” (valued Rs 100), one is “silv... | 4 | [
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what is the derivative of r = t squared/8 + 1 ?
February 18th 2010, 12:37 AM #1
Newbie
Joined
Jan 2010
From
England
Posts
13
what is the derivative of r = t squared/8 + 1 ?
Hello,
Among my collection of Maths books, I have found a great AS Maths book which is, at last, really clearly explaini... | 4 | [
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Asymptotic evaluation of an integral..
September 18th 2006, 10:30 AM #1
Newbie
Joined
Sep 2006
Posts
7
Asymptotic evaluation of an integral..
Let be the integral:
Int(-oo,oo)dx f(x)exp(iux) I would like to know if there is any method to
evaluate it for u-->oo
-Stationary phase method:=can'... | 5 | [
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Simplifying differential solutions - cotx e^4x
September 18th 2012, 04:09 AM
froodles01
Simplifying differential solutions - cotx e^4x
Question is f(x) = e^4x cotx
Fine, I'll use product rule;
dy/dx = V du/dx * U dv/dx
Let U = e^4x du/dx = 4e^4x
V = cot x dv/dx = -cose^2 x
so dy/dx = cotx 4e... | 5 | [
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-0.1... | 45,793 | 45793 | |
Discontinuity and Vertical Asymptotes
January 29th 2009, 05:47 PM #1
Newbie
Joined
Sep 2008
Posts
13
Discontinuity and Vertical Asymptotes
So I have a problem that I have all parts figured out except for the final part of the question.
The function is f(x)=(x^2 - 1) / (2x^2 - 2x).
The function ... | 4 | [
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... | 45,794 | 45794 | |
Math Help
December 9th 2009, 06:40 PM #1
Junior Member
Joined
Oct 2008
Posts
43
Subring?
Ok.
End of semester is up and my professor is pounding new information down our throats in an effort to exhaust the outlined curriculum. We've barely covered definitions of rings, subrings, ideals,
etc. We'... | 5 | [
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Math Forum Discussions - Re: PolynomialQuotient slow
Date: Jan 2, 2013 9:14 PM
Author: Daniel Lichtblau
Subject: Re: PolynomialQuotient slow
On Monday, December 31, 2012 6:45:13 PM UTC-6, Roman Pearce wrote:
> Something seems wrong here with the performance of PolynomialQuotient. Is there blowup because the leading c... | 4 | [
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Posts from September 20, 2011 on Programming Praxis
Problem 3 at Project Euler asks the reader to solve this problem:
The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143?
Given the amount of factoring code on this website, I find that problem quite simple. B... | 4 | [
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0.01159... | 45,797 | 45797 | |
Solving Multivariable Diophantine Equations
Date: 05/03/98 at 17:32:06
From: Jin
Subject: Diophantine equations
How would I go about solving this multivariable diophantine equation?
x^2 + y^2 - 2xz = 0
For example, I see that (1,3,5) works, but I'd like to know how to
solve it.
Date: 05/07/98 at 10:54:26
From... | 5 | [
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Evidence from one coin flip
Earlier today, on Hacker News someone posted a link to Tom Moertel's blog post "On the evidence of a single coin toss", where he poses a question about probabilities: if he claims he had a
perfectly-biased always-heads coin, and you toss it once and it comes up heads, should that sway your ... | 4 | [
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