出典:Wikipedia
出典:『Wikipedia』 (2011/05/27 23:10 UTC 版)
In mathematics, a Schur-convex function, also known as S-convex, isotonic function and order-preserving function is a function
, for which if
where x is majorized by y, then
. Named after Issai Schur, Schur-convex functions are used in the study of majorization. Every function that is convex and symmetric is also Schur-convex.