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 Oct 9 reviewed Reject Oct 7 comment minimum number of times to change tyres. To be honest, I do not even know how to prove the above solution is optimal. I cannot find any better solution does not constitute a proof! Oct 7 asked minimum number of times to change tyres. Oct 5 reviewed Edit definition of a sufficient statistic Oct 5 comment Holder continuity constant and dervative. I also know my fn are monotonically decreasing. Somehow my set of conditions allows to prove something, but it is hard to write down all of them Oct 5 comment Holder continuity constant and dervative. no, i have proved it before, but i forgot how it was done now... Oct 5 comment Holder continuity constant and dervative. Yes, also i know the derivatives of fn are bounded. I know f has derivatives everywhere except at one point, where it still admits left and right derivative, but not sure if they agree. Also fn and f are all convex. Oct 5 asked Holder continuity constant and dervative. Oct 3 comment If $f$ is continuously differentiable in $[a,b]$, $f(a)=f(b)$, and $f'(a)=f'(b)$, then there exist \$a