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October 8th, 2011, 12:21 PM   #1
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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 :
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October 8th, 2011, 01:27 PM   #2
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Is this a competition question?
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October 8th, 2011, 01:46 PM   #3
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Re: Functional equation

I found it in an old book without solutions...
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October 9th, 2011, 02:55 AM   #4
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The problem appears as question 8 in this competition. The relevant deadlines have now been passed.
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