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

Feb2313 09:25 AM
micromass

1 
27,680 
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 
2,126 
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 
1,172 
Hello all. I have a question regarding the statement
If S(m)=S(n), then m=n, where S(m)=m\cup{m}, the successor of...

Nov1012 09:46 AM
StatOnTheSide

2 
648 
Please take a look at this proof:
http://s12.postimg.org/qa24fgbq5/proof.jpg
The thing I do not get is how they...

Jul1013 02:43 PM
verty

5 
650 
I recall reading somewhere that the mean value of a continuous variable is situated at a point that acts as a fulcrum...

Apr2612 11:08 PM
chiro

10 
1,535 
Prove the following:
If f : A \rightarrow B and g : C \rightarrow D , then f \cap g : A \cap C \rightarrow B...

Oct2707 04:35 PM
Jacobpm64

7 
3,320 
Let:
1) P be one place operation
2) H be two place operation
3) G be two place predicate
4) k, m be two...

Nov211 10:53 AM
solakis

2 
901 
How do we prove in predicate calculus using the laws of universal end existential quantifiers,propositional...

Oct408 04:40 PM
evagelos

1 
1,594 
\forall a\forall b\leq b <>a^{2}\leq b^{2})].
or in words: for all a and for all b , if a>0 and b>0 then ...

Dec1608 11:21 PM
MathematicalPhysicist

9 
1,640 
Let:
1)P be one place operation
2)K be one place operation
3) c be a constant
let :

Oct3111 12:04 PM
CompuChip

2 
1,233 
Given :
a)
1) c is a constant
2) P and K are one place operation symbols
3) G and H are a two place...

Jul1912 07:34 PM
xxxx0xxxx

7 
1,390 
I am having issues with a proof, as follows.
*U = universal set , P(U) = power set of a universal set
For all...

Apr2311 10:46 PM
arsenal997

2 
1,714 
Hello Members
I am having a little bit of a problem solving this proof for my Discreet math course.
If g and f...

May3006 02:06 PM
matt grime

1 
3,021 
Prob.2

Mar2411 04:33 PM
tinytim

6 
689 
Suppose n=ab, show that a^2<=n or b^2<=n.

Jan2709 09:09 PM
saadsarfraz

5 
853 
Hello, This is my first question here. So, lets see how it goes. I need a proof to a simple problem. The proof seems...

Oct2808 05:18 AM
CompuChip

1 
4,759 
Hi, how would you show that 4^(k)+4 * 9^(k) \equiv 0 (mod 5)

Jan2109 02:14 AM
Mentallic

22 
1,840 
X' \cup Y' \subseteq (X \cap Y)'
n \in X' \cup Y'
n \in X'  n \in Y'
(n \in U, n \notin X)(n \in U,...

Jan2610 11:53 AM
nameVoid

0 
732 
I intend to show, for a set ##X## containing ##A_i## for all ##i##, $$\overline{\bigcup A_i}\supseteq \bigcup...

Oct513 02:00 PM
Mandelbroth

0 
387 
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 
1,822 
Hello all,
I've been asked for a graduate level course to do a proof using induction that shows that nCr always...

Oct1408 06:12 AM
D H

38 
11,587 
I'm to prove that for n>=4, 2^n < n! holds, but I don't know where to go after the inductive hypothesis that it holds...

Feb612 12:02 PM
bryanfoobar

4 
22,716 
Hello all,
I am trying to prove that a set is closed by induction. Specifically, let me define
Let B_t be sets,...

Apr2012 10:21 AM
submartingale

0 
675 
Suppose we are asked to prove :
If \lim_{n\to\infty}x_{n} = L and x_{n} is decreasing,then \forall n.
On the...

Jun911 07:38 AM
micromass

17 
2,016 
Suppose you have a formal proof of a statement S, but you want to prove a statement S' which is in some way similar to...

May1609 01:58 PM
mXSCNT

0 
681 
Lets say I have \aleph_1 numbers of sets that each have \aleph_1
number of elements and I want to show that the...

Aug1612 01:34 PM
Bacle2

9 
892 
Given sets X1,...,Xn the projection from the product X1 * ... *Xn is the function
pri = prxi : X1 * ... *Xn → Xi ,...

Mar1812 06:52 PM
Square1

12 
2,555 
So, I made it to the finals for my fantasy football league. The winner receives $100 and the runnerup $10 (maybe...

Dec1012 06:38 AM
jjpbq6

0 
634 
Hello!
I've come here today seeking information about how I can build a ranking system that will sort through some...

Aug110 06:35 PM
CRGreathouse

3 
1,287 
Dear mates,
I run into a difficulty on the captioned area and am looking forward for enlightenments.
Consider...

May2907 11:18 AM
MWG@berlin

0 
4,099 
I have always wondered:
Is the product rule and addition rule for that matter axioms of the probability theory or...

Jul3013 08:07 PM
chiro

2 
374 
Hi,
I am interested in the product of a Gaussian random variable with itself. If X is Gaussian then what is X^2? We...

Mar1411 06:19 AM
architect

3 
2,645 
say, E(1/x)=a and E(y)=b. a and b are constants and x and y are random variables.
Can I say E(y/x)=b/a? Thanks.

Apr310 04:52 PM
zli034

2 
1,420 
Hi, All,
Let x1 x2... Xn be correlated random events (or variables). Say P(X1), P(X2)..., P(Xn) can be computed,...

Apr2309 02:13 PM
mXSCNT

1 
2,419 
If you have P(x) distribution and P(y) distribution, then one may write the charactersitic functions of each of these...

Jan2009 06:02 PM
natski

0 
633 
Hi all,
I am using a Xi squared test to for independence of two sets of categorical data.
So lets say I have a...

Oct2911 12:41 AM
Stephen Tashi

1 
1,380 
If you have a data set which consists of n variables and m factors which are essentially randomly correlated and you...

Mar2609 10:52 AM
engineer23

0 
1,410 
so i'm having problems with logic exercies especially when it asks you to prove long equations like when you just use...

Jan2413 03:35 PM
Andrax

2 
591 
I'm building the circuit for controlling LEDs line with LDR sensor . It can be done by using Many OpAmp but I...

Mar2909 09:35 PM
Vincent90

0 
1,082 
"Pat arrives at the bus stop at some time U, which is uniformly distributed between time 0 and time 1, and waits for a...

Oct3008 08:05 PM
Enuma_Elish

1 
1,245 