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May 17, 2022 at 14:27 vote accept Andromeda
May 17, 2022 at 13:46 comment added Andromeda I think the calculation of the convex hull can be left out. Indeed, the inclusion $\operatorname{conv}(F_0\cup(-A_+))\subseteq F_0-A_+$ is obvious (the right hand side is convex and contains $F_0$ and $-A_+$), the other one is clear by the reasoning in your answer (which does not use these set equalities).
May 14, 2022 at 11:02 comment added Matthew Daws You are right. I hope I have now fixed these problems. This technique of using $(0,1)F$ instead of $F$ occurs elsewhere, when you want to get rid of "boundary" problems.
May 14, 2022 at 11:01 history edited Matthew Daws CC BY-SA 4.0
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May 14, 2022 at 8:34 vote accept Andromeda
May 14, 2022 at 8:53
May 13, 2022 at 18:43 history edited Matthew Daws CC BY-SA 4.0
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May 13, 2022 at 18:33 history answered Matthew Daws CC BY-SA 4.0