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

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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

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.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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

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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

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.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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