Open Question: Find all functions f:R-->R that satisfy 2*f(x) = f(x+y) + f(x+2y) for all real x ; and all y >= 0.?
20:37 Publicado por Anónimo
You say ... y >= 0, i.e., y = 0
and then you immediately parenthecise
that y is positive.
Did you want to say non-negative ?
Make up your mind.
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