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Untitled
editDo you think it needs a graph? Yes — Preceding unsigned comment added by 176.27.1.187 (talk) 19:03, 22 November 2012 (UTC)
items that are concave and convex — Preceding unsigned comment added by 34.207.62.54 (talk) 14:32, 5 April 2018 (UTC)
Concave set
editI think the description of a concave set is wrong. Presumably a convex set is meant.Madyno (talk) 20:32, 4 August 2018 (UTC)