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## #1 2013-02-20 13:16:42

{7/3}
Member
Registered: 2013-02-11
Posts: 210

### 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.

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## #2 2013-02-20 13:19:30

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### 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.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #3 2013-02-20 16:01:13

{7/3}
Member
Registered: 2013-02-11
Posts: 210

### 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.

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## #4 2013-02-21 02:01:51

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Need help to prove

Hi;

That is okay, asking a question is not disturbing.

Last edited by bobbym (2013-02-21 02:02:05)

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline