Recent content by blaah

  1. B

    Prove that a function is concave

    for all x, x* i know that for the function to be concave all the points on the tangent need to be on or below the function...but i doesn't help...i've been staring at the problems for days now, with no result...
  2. B

    Prove that a function is concave

    Homework Statement f:R->R, c' prove that f is concave iff f(x*)+(x-x*)f'(x*)>=f(x) Homework Equations assume the function is only once differentiable The Attempt at a Solution i have no idea how to approach this question...:confused:
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