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

Feb2313 09:25 AM
micromass

1 
32,592 
Hello.
I have recently started taking a course in the foundations of analysis. We started off with the completeness...

Sep311 11:11 AM
evagelos

13 
3,690 
Theorem:
If P(A) = 1, P(B) = 1, then P(AB) = 1
My book starts out with the proof as follows:
P(A U B) >= P(A) =...

Jan1011 06:13 PM
gb7nash

2 
3,840 
I'm trying to understand the proof that the OTP is a perfect cipher.
I tried to understand the proof shown in...

Aug2012 05:56 PM
Bipolarity

4 
645 
Lemma: If A is an at most countable alphabet, then the set A^* of strings over A is countable.
Proof begin:
Let...

Feb1114 02:45 PM
Hornbein

4 
395 
My book presents the theorem that the empty set is a subset of every set as follows:
Let A be a set.
Let x be any...

Oct112 10:10 AM
alan2

7 
4,798 
Today while day dreaming I discovered something interesting. I can prove a=a.
Here's how:
You can prove P=>P using...

Jul712 01:51 AM
xxxx0xxxx

3 
1,104 
I've been trying to solve this problem for a week now, but haven't been able to. Basically I need to prove that a...

Sep1904 07:10 PM
gesteves

4 
6,477 
If Z1,Z2....Zn are standard normal random variable that are identically and independently distrubuted, then how can...

Oct1508 06:26 AM
statdad

1 
15,894 
I am currently trying to prove the following:
An equation in X with righthand member \oslash can be reduced to one...

Jun710 04:25 AM
CompuChip

3 
3,110 
I want to learn how to prove the Zorn's lemma.
Can anyone here help me?

Aug1312 03:27 AM
quantum123

8 
3,712 
http://bildr.no/view/1115383
i wonder if anyone could explain the proof for theorem 4.3 i have understood...

Feb2412 02:34 PM
georg gill

2 
945 
Hi guys,
My question is to prove that the set of algebraic numbers is countable, then also prove that the set of...

Sep810 10:32 AM
CompuChip

1 
1,065 
Could someone point me to a book that has a proof of the above statement?
Thanks in advance!

Apr410 02:10 AM
Jon Richfield

8 
7,108 
I'd like to know how to prove (or show that it is reasonable) that the probability that a random vector (X, Y) assumes...

Jul411 07:40 PM
ndrue

12 
1,880 
P(x) = "x is Provable"
axiom 1 : P(x)→x "Statement x can be proven true."
1. (x∧¬x) consider a contradiction
2. x...

May2513 12:59 PM
lugita15

13 
1,171 
Let \varphi and \psi both be formulae, and let \Gamma be a set of formulae.
If \Gamma \cup \{\varphi\} \models...

Aug106 06:54 AM
honestrosewater

8 
2,432 
Hi, i had recently come across the proof of the strong law of large number.
Inside the proof , it assumed the random...

Jul1312 04:19 AM
chiro

1 
934 
Hi all. I need to prove or disprove if process Y_n=1/2*X_n+1/4*X_{n1}+1/8*X_{n2} are stricly stationary. X_n,n\in R...

Apr714 04:14 PM
mathman

1 
260 
How do we prove in propositional calculus :
......p^(qvr) <===> (p^q)v(p^r) semantically and syntactically

Sep2008 03:45 AM
CompuChip

5 
4,685 
If we have a pythagorean triple a^2 + b^2 = c^2 and we need to show that a and b both cannot be odd. I found a proof...

Jan2609 11:24 AM
Focus

1 
1,169 
How can I prove that
P( there exist a t>0 : the changeP_t is not in {0,1} ) = 0
where (P_t)_t>0 is a piosson Proces...

Nov2610 05:55 PM
mathman

1 
807 
I can't seem to find proofs of formulas used in this area of maths. Does anyone know any place to find them?

Oct304 03:34 AM
Ethereal

0 
6,520 
Hey guys, long time lurker, first time poster!
Just having some trouble with something..Im probably just looking at...

May2409 11:00 PM
mrwicky

4 
9,806 
Proof of Ira Gessel's Lattice Path Conjecture

Jun2608 05:08 PM
Count Iblis

0 
1,249 
Hello all,
I'm practicing proofs and I'm stuck. Here it is:
Prove that there are infinitely many solutions in...

Oct3112 07:17 AM
Klungo

30 
1,965 
So I thought up a "proof" for infinite primes. I'm assuming I did something wrong, but I don't know what, it would be...

May614 08:57 PM
m84uily

10 
514 
I'm trying to read this proof, and I'm stuck on the inequality on page 27 following the statement "It follows that...

Sep2911 09:08 AM
Fredrik

2 
2,181 
Below is a proof of one of the key steps in Godel's first incompleteness theorem. It appears to prove the theorem....

Oct2712 01:01 AM
andrewkirk

2 
817 
The proof that poisson process has exponential interarrival time is common place. The proof which i am trying to do is...

Mar208 07:49 PM
mmehdi

2 
9,792 
How would one show a morphism is an epimorphism iff it is surjective (ONTO)?

Nov1713 10:16 AM
PSarkar

3 
971 
Hello all I've been practicing proofs and would like to know if I'm on the right track. Here it is:
If the sum of...

Oct3012 07:50 PM
nicnicman

6 
669 
Hi ,my lecturer ask me to prove ~(p^q) = ~pv~q i.e ~(p^q) is equivalent to ~pv~q,without using the true tables.
...

Sep2208 10:53 PM
poutsos.A

4 
10,762 
hi there
i just need a hint for this question please :
By giving a suitable map to or from N (thats a natural...

Apr805 01:25 PM
gravenewworld

7 
7,554 
I have been reading some books about the proof of the Central Limit Theorem, all of them use the uniqueness of moment...

Mar907 12:27 PM
ljxaa

5 
10,341 
Hi I want to prove this using momentgenerating functions. I would like to do this without going in to the standard...

Dec411 10:57 AM
skwey

1 
1,074 
I'm trying to prove that the axiom of choice is equivalent to the following statement:
For any set X and any...

Dec109 06:51 PM
leetaxx0r

2 
1,899 
A(B\bigcapC)=(AB)\bigcup(AC)
If AB={xlx\inA and x\notinB}
AC={xlx\inA and x\notinC}
then...

Jun1913 04:04 PM
mathman

4 
1,191 
Hi there. I want to show that this is a variance matrix:
http://i.imgur.com/kQuTL.png
I think I can do this by...

Mar512 07:06 PM
Kuma

0 
1,043 
Hey all,
Can anyone prove this theorem?
Let N (natural numbers) > X be an onto function. Then X is...

Nov2807 12:38 PM
Coin

8 
2,218 
Hey there. I'm asked to prove:
If X1,...Xn are random variables defined on a set Ω and B1,...,Bn C R1 then prove...

Feb212 10:12 PM
Kuma

0 
1,255 