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``proof of jensen inequality'' by tze on 2005-06-30 19:41:11
the most important part of this proof is: tangent line at the graph of the convex function, is less or equal to the convex function. Wouldn't it be nice if you can add a proof of that?

I guess it has to do with the property that the derivative of a convex function is increasing. but i'm not sure.
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