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May 2, 2018 at 16:32 comment added Turbo Actually I found that one out already.
May 2, 2018 at 16:32 vote accept Turbo
May 2, 2018 at 16:31 comment added Robert Israel Same counterexample.
May 2, 2018 at 2:01 comment added Turbo thank you. this was a silly problem then. Would you know if $x_1y_1+\dots+x_ny_n\leq c$ with $0\leq x_1,\dots,x_n\leq 1$and $0\leq y_1,\dots,y_n\leq 2^n-1$ is not convex as well? We know $xy\leq c$ is convex if $0\leq x\leq 1$ holds.
Apr 30, 2018 at 8:52 vote accept Turbo
Apr 30, 2018 at 8:52
Apr 30, 2018 at 8:09 history answered Robert Israel CC BY-SA 3.0