Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:25 AM
micromass

1 
27,606 
Hi, I hope I'm asking this in the right place. I need to understand this in order to complete a project, but it's not...

Oct2513 10:23 PM
Stephen Tashi

1 
661 
Hi Everyone,
What are the difference between totally and partially ordered sets?
Any examples would help except...

Sep2312 07:59 PM
HallsofIvy

2 
1,932 
As there are an infinite number of time frames, does that mean that the probability of two things happening at the...

Jul1510 10:56 PM
CRGreathouse

8 
5,362 
Imagine a simple chocolate bar promotion in which there is a 6 in 1 chance of winning another bar. My question is; If...

Jul2810 04:21 PM
Jamma

4 
1,040 
The cumulative distribution function of a continuous random variable is given
as follows:
0 0
( ) 0 5
5
1 5
X...

Apr813 09:41 AM
mfb

1 
283 
I'm supposed to prove that if:
n^2 % 3 = 0
Then
n % 3 = 0
I'm not sure how to proceed here?
Does it got...

Feb2805 02:33 AM
DrNiKoN

8 
1,821 
Ok, given a set: A
How many distinct x tuples can be created using a subset of A?
Example:
A = 20
I want...

Apr3005 09:50 PM
BicycleTree

31 
5,845 
1 out of 5 italians speak english. 1 out of 5 people in italy are tourists. 1 out 2 tourists speaks english.
You...

Oct1305 03:47 PM
mathman

1 
1,352 
This can get a little bit fundamental or "axiomatic", if you will. Let's say we can describe sets by prescribing a...

Oct2711 11:18 PM
PatrickPowers

9 
1,908 
Hi all,
I know how to express the Euclidean distance between two znormalized vectors using the Pearson correlation...

Jan305 12:32 PM
drago

0 
1,884 
Hi,
Does anyone know whether there is any dependence between the cross correlation coefficients at different lags?...

Feb2105 01:49 AM
drago

0 
2,221 
Goodevening,
I am confused with Venn diagrams questions(2/3 circle diagrams). Can i find some online resources which...

Jan111 06:57 PM
JeremyHorne

7 
13,298 
This may be a bit vague, as I don't remember all the details.
When proving Turing's halting problem, at some point...

Jan308 01:54 PM
Coin

4 
2,179 
I know that V, Ord and Card are proper classes because otherwise foundation, successor and Cantor's theorem would be...

Feb308 07:24 AM
Hurkyl

9 
1,911 
Randomly permute (1,...,n). What is the probability that exactly i points are fixed?
I think it should be
...

Feb1408 05:37 PM
Dragonfall

2 
1,813 
Let M be a system (possibly proper classsized directed graph where the class of children of a given node is a set). A...

Mar108 04:12 AM
Dragonfall

1 
1,499 
Self explanatory. The Cantor's theorem which am referring to is that the cardinality of the power set of any set is...

May1108 09:52 AM
Dragonfall

2 
1,495 
How do you show that the surreal numbers form a proper class?

May1508 04:22 PM
Hurkyl

13 
2,313 
This may be a little handwavy:
Let a be an ordered, properclasssized sequence...

May1308 02:03 PM
Dragonfall

2 
1,648 
Why do membership chains (a\in b\in c\in ...) have length at most \omega?

May2808 11:27 AM
Dragonfall

2 
1,329 
There is no proper class such X such that every totally ordered set is isomorphic to a subclass of X.
I'm using...

Jun1208 11:35 AM
Dragonfall

2 
1,084 
Can someone give me a list of problems which at first sight require the axiom of choice, but do not?

Jul2508 04:20 PM
gel

17 
3,130 
What is the expected number of fixed points in permutations? I got 1 as answer.

Aug1908 03:36 PM
HallsofIvy

1 
1,307 
http://en.wikipedia.org/wiki/Image:Omegaexpomega.svg
It says it's a representation of \omega^\omega. But I really...

Sep3008 10:03 PM
Dragonfall

13 
1,000 
There is a theorem which says if a certain natural number sequence exists then a certain type of large cardinal...

Sep2908 04:46 PM
Dragonfall

0 
869 
What sort of operations can you pair up with V (class of all sets in ZFC) that turns it into various algebraic...

Nov1108 11:58 AM
enigmahunter

3 
1,196 
Is every first order theory with finitely many axioms automatically complete? An axiom schema like that of ZFC's...

Mar2509 05:11 PM
Preno

2 
603 
On the Wikipedia page about Laplace's demon, it says
"In 2008, David Wolpert used Cantor diagonalization to "slam...

Jun809 11:56 PM
EnumaElish

1 
1,294 
A universal Turing machine is up to a log factor slower than the TM it's trying to simulate. What is the slowdown...

Aug311 01:23 PM
Dragonfall

2 
1,133 
What is a measure of "jointness" of a joint distribution? Correlation?

Nov2912 03:18 PM
mathman

1 
580 
Is there a theorem which says that if certain natural number sequences exist, then some large cardinals exist. Can...

Jun2713 09:19 PM
alephaleph

1 
538 
Can I have a nontrivial example of where \forall x P(x) \rightarrow \exists x P(x) fails?

Aug513 03:15 PM
Dragonfall

4 
401 
Given a length preserving bijection on nbits uniformly at random, what is the expected number of cycles? Cycles being...

Aug1813 08:38 PM
Dragonfall

4 
380 
Problem Statement:
How many 5 digit number can be formed from the integers 1,2, ..., 9 if no digit can appear...

Sep512 12:37 AM
haruspex

3 
909 
I havent done a probability problem in a long time. Thank you.
Assume that 8 % of the students fall in some...

Mar3005 11:03 AM
honestrosewater

8 
1,439 
Hello,
Im studying Markov sources at the moment and i have dificulty in solving and understanding one type of...

Oct2012 09:58 AM
digfarenough

7 
620 
Hey,
id want to ask you how its called in english a huffman code in wich any word is not prefix for another word???...

Nov1912 09:34 AM
Drao92

0 
638 
Hi everyone,
I have the following exercise.
Fx(x)=0, x<1 or x>1
Fx(x)=1/2, x=
g(x)=x^2+1  this is the function...

Apr2113 01:24 AM
Stephen Tashi

3 
460 
Hello,
i have the following conditional distribution
fXY(x,y)=2, of 0<x<1 and x<y<1
When i calculate the marginal...

Apr2413 03:50 AM
chiro

11 
437 
fXY(x,y)=2 if 0<x<1 and x<y<1, 0 for other intervals
I have to calculate: P((x>0.5)π(y<0.5)).
I think it 0 but im...

Apr2413 02:42 PM
mathman

1 
460 