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May 28th, 2013, 05:32 PM  #1 
Newbie Joined: May 2013 Posts: 4 Thanks: 0  Proving concave functions and convex sets
Hi, having some problems with these questions.. 1)Prove that the function y=f(X1,X2) ; y= X1^1/2 + X2^1/2 is a strictly concave function on R++ 2) follow up question to 1. D = {X1,X2  X1^1/2 + X2^1/2 = y} Prove that D is a convex set. 

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concave, convex, functions, proving, sets 
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