Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

## #1 2013-02-21 12:16:42

{7/3}
Full Member

Offline

### Need help to prove

How can i prove this-for all x,y in N, if x^y=y^x then x=y.

There are 10 kinds of people in the world,people who understand binary and people who don't.

## #2 2013-02-21 12:19:30

bobbym

Online

### Re: Need help to prove

Hi;

You can not prove that because 2^4  = 4^2 and
2 ≠4

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #3 2013-02-21 15:01:13

{7/3}
Full Member

Offline

### Re: Need help to prove

Oh yeah,sorry for disturbing

There are 10 kinds of people in the world,people who understand binary and people who don't.

## #4 2013-02-22 01:01:51

bobbym

Online

### Re: Need help to prove

Hi;

That is okay, asking a question is not disturbing.

Last edited by bobbym (2013-02-22 01:02:05)

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.