This comment of mine isn’t particularly substantive, and is just about terminology. Hm, I guess it’s probably normal/standard when talking about curves like these to describe the ones curving down (concave down) as “concave” and the ones curving up “concave up” as “convex”, but if this curve is the frontier of what is achievable, it seems more natural to me to speak of whether the region that is achievable is concave or convex, but this gives thee pictures the opposite names. Unfortunate.
This comment of mine isn’t particularly substantive, and is just about terminology.
Hm, I guess it’s probably normal/standard when talking about curves like these to describe the ones curving down (concave down) as “concave” and the ones curving up “concave up” as “convex”,
but if this curve is the frontier of what is achievable, it seems more natural to me to speak of whether the region that is achievable is concave or convex, but this gives thee pictures the opposite names. Unfortunate.