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

Feb2313 09:25 AM
micromass

1 
32,456 
I'm attempting to derive the MGF for the Weibull distribution. I know that E(e^{tx}), which equals the integral shown...

Apr1211 08:16 PM
donald17

2 
2,677 
i need to prove that the following is not surjective. how do i do that?
let f:R>R be the function defined by...

May1410 06:07 AM
HallsofIvy

2 
1,468 
A continuoustime markov chain is recurrent if and only if the embedded discrete time markov chain is recurrent. But,...

Apr711 01:36 AM
bpet

1 
1,670 
What is the value of prob(conclusion C1 is true IF premise P1 is true)? It depends on the prior probability that the...

Dec1806 10:57 PM
Dooga Blackrazor

8 
2,209 
How might one show that (aleph_null)! = aleph_1?

May108 03:32 PM
Hubert

4 
2,951 
Determine the sample space for this random experiment:
An urn contains six balls numbered 16. The random...

Oct705 10:00 AM
Tom Mattson

2 
1,683 
for n = 1, 2, 3, 4, 5, 6, 7, 8, 9....
an = 0, 0, 2, 5, 10, 17, 24, 35, 47....
That is the only data I have. Can...

Dec510 08:36 PM
dopeyranger

0 
1,389 
Hello fellow mathematicians/computerscientists!
I have a question:
If a subset of a language is not context...

Mar912 06:08 PM
Hurkyl

1 
1,653 
Hey all, How do we write this in first order logic?
In every company, there is exactly one employee who has no...

Oct3107 04:53 AM
dork

0 
1,974 
First up apologies if this is a violation of a rule or COC.
Anyway new paper was published a couple of days ago...

Apr1010 04:03 PM
CRGreathouse

3 
1,068 
A computer prints two papers,
on the first paper is written, "ASDDSF DFGDF ERSDKUF DFD RRVFDSDA"
on the second...

Dec710 03:57 PM
SW VandeCarr

12 
2,024 
Okay... this is a really simple question but I am pratically going nuts over it I can't sleep, I've been looking at it...

Sep1409 06:46 AM
SW VandeCarr

4 
5,422 
I have been trying to figure out the proof to this problem for the past couple of days and still don't have an answer....

Oct2109 10:11 AM
g_edgar

1 
841 
Joe thinks that no more than 20% of students in his statistics class will get an A in the final examination. To prove...

Apr3005 09:48 PM
BicycleTree

7 
1,049 
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 
871 
Hi Everyone,
What are the difference between totally and partially ordered sets?
Any examples would help except...

Sep2312 07:59 PM
HallsofIvy

2 
2,217 
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 
5,591 
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 
1,090 
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 
320 
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 
1,901 
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 
6,004 
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 
1,396 
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 
2,057 
Hi all,
I know how to express the Euclidean distance between two znormalized vectors using the Pearson correlation...

Jan305 12:32 PM
drago

0 
1,957 
Hi,
Does anyone know whether there is any dependence between the cross correlation coefficients at different lags?...

Feb2105 01:49 AM
drago

0 
2,360 
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 
14,504 
This may be a little handwavy:
Let a be an ordered, properclasssized sequence...

May1308 02:03 PM
Dragonfall

2 
1,728 
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 
1,125 
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 
3,659 
What is the expected number of fixed points in permutations? I got 1 as answer.

Aug1908 03:36 PM
HallsofIvy

1 
1,346 
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 
1,070 
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 
942 
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 
1,236 
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 
632 
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 
1,371 
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 
1,157 
What is a measure of "jointness" of a joint distribution? Correlation?

Nov2912 03:18 PM
mathman

1 
625 
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 
707 
Can I have a nontrivial example of where \forall x P(x) \rightarrow \exists x P(x) fails?

Aug513 03:15 PM
Dragonfall

4 
508 
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 
530 