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Timeline for An inequality on concave functions

Current License: CC BY-SA 3.0

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May 31, 2011 at 12:43 comment added user11870 I just found that this proof is wrong since $[(\log\circ f)(tx)]'$ is different from $(\log\circ f)'(tx)$. So, anyone can help? Thanks!
May 29, 2011 at 15:09 history answered user11870 CC BY-SA 3.0