June 27th, 2017, 11:21 AM  #11 
Math Team Joined: Dec 2013 From: Colombia Posts: 6,854 Thanks: 2228 Math Focus: Mainly analysis and algebra  
June 27th, 2017, 01:01 PM  #12 
Member Joined: May 2017 From: France Posts: 50 Thanks: 1 
edit : I must think
Last edited by Dattier; June 27th, 2017 at 01:07 PM. 
June 27th, 2017, 01:23 PM  #13 
Member Joined: May 2017 From: France Posts: 50 Thanks: 1 
the idea $\displaystyle g(x)\frac{\min(g'')}{2}x^2$ is convex.


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inegality, inequality, strange 
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