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Set Theory, Logic, Probability, Statistics

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Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:25 AM
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...
Oct25-13 10:23 PM
Stephen Tashi
1 661
Hi Everyone, What are the difference between totally and partially ordered sets? Any examples would help except...
Sep23-12 07:59 PM
2 1,932
As there are an infinite number of time frames, does that mean that the probability of two things happening at the...
Jul15-10 10:56 PM
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...
Jul28-10 04:21 PM
4 1,040
The cumulative distribution function of a continuous random variable is given as follows: 0 0 ( ) 0 5 5 1 5 X...
Apr8-13 09:41 AM
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...
Feb28-05 02:33 AM
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...
Apr30-05 09:50 PM
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...
Oct13-05 03:47 PM
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...
Oct27-11 11:18 PM
9 1,908
Hi all, I know how to express the Euclidean distance between two z-normalized vectors using the Pearson correlation...
Jan3-05 12:32 PM
0 1,884
Hi, Does anyone know whether there is any dependence between the cross correlation coefficients at different lags?...
Feb21-05 01:49 AM
0 2,221
Goodevening, I am confused with Venn diagrams questions(2/3 circle diagrams). Can i find some online resources which...
Jan1-11 06:57 PM
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...
Jan3-08 01:54 PM
4 2,179
I know that V, Ord and Card are proper classes because otherwise foundation, successor and Cantor's theorem would be...
Feb3-08 07:24 AM
9 1,911
Randomly permute (1,...,n). What is the probability that exactly i points are fixed? I think it should be ...
Feb14-08 05:37 PM
2 1,813
Let M be a system (possibly proper class-sized directed graph where the class of children of a given node is a set). A...
Mar1-08 04:12 AM
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...
May11-08 09:52 AM
2 1,495
How do you show that the surreal numbers form a proper class?
May15-08 04:22 PM
13 2,313
This may be a little hand-wavy: Let a be an ordered, proper-class-sized sequence...
May13-08 02:03 PM
2 1,648
Why do membership chains (a\in b\in c\in ...) have length at most \omega?
May28-08 11:27 AM
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...
Jun12-08 11:35 AM
2 1,084
Can someone give me a list of problems which at first sight require the axiom of choice, but do not?
Jul25-08 04:20 PM
17 3,130
What is the expected number of fixed points in permutations? I got 1 as answer.
Aug19-08 03:36 PM
1 1,307 It says it's a representation of \omega^\omega. But I really...
Sep30-08 10:03 PM
13 1,000
There is a theorem which says if a certain natural number sequence exists then a certain type of large cardinal...
Sep29-08 04:46 PM
0 869
What sort of operations can you pair up with V (class of all sets in ZFC) that turns it into various algebraic...
Nov11-08 11:58 AM
3 1,196
Is every first order theory with finitely many axioms automatically complete? An axiom schema like that of ZFC's...
Mar25-09 05:11 PM
2 603
On the Wikipedia page about Laplace's demon, it says "In 2008, David Wolpert used Cantor diagonalization to "slam...
Jun8-09 11:56 PM
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...
Aug3-11 01:23 PM
2 1,133
What is a measure of "jointness" of a joint distribution? Correlation?
Nov29-12 03:18 PM
1 580
Is there a theorem which says that if certain natural number sequences exist, then some large cardinals exist. Can...
Jun27-13 09:19 PM
1 538
Can I have a non-trivial example of where \forall x P(x) \rightarrow \exists x P(x) fails?
Aug5-13 03:15 PM
4 401
Given a length preserving bijection on n-bits uniformly at random, what is the expected number of cycles? Cycles being...
Aug18-13 08:38 PM
4 380
Problem Statement: How many 5 digit number can be formed from the integers 1,2, ..., 9 if no digit can appear...
Sep5-12 12:37 AM
3 909
I havent done a probability problem in a long time. Thank you. Assume that 8 % of the students fall in some...
Mar30-05 11:03 AM
8 1,439
Hello, Im studying Markov sources at the moment and i have dificulty in solving and understanding one type of...
Oct20-12 09:58 AM
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???...
Nov19-12 09:34 AM
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...
Apr21-13 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...
Apr24-13 03:50 AM
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...
Apr24-13 02:42 PM
1 460

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