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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
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 87,258

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

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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
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 87,258

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

Offline

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