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October 8th, 2011, 12:21 PM  #1 
Newbie Joined: Oct 2011 Posts: 2 Thanks: 0  Functional equation
Find all function defined on the set of real numbers x,y and obtaining real values such that for any real numbers x,y that equation is true : 
October 8th, 2011, 01:27 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,469 Thanks: 2038 
Is this a competition question?

October 8th, 2011, 01:46 PM  #3 
Newbie Joined: Oct 2011 Posts: 2 Thanks: 0  Re: Functional equation
I found it in an old book without solutions...

October 9th, 2011, 02:55 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,469 Thanks: 2038 
The problem appears as question 8 in this competition. The relevant deadlines have now been passed.


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equation, functional 
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