出典:Wikipedia
出典:『Wikipedia』 (2009/04/13 16:34 UTC 版)
In mathematics, an ordered semigroup is a semigroup (S,•) together with a partial order ≤ that is compatible with the semigroup operation, meaning that x ≤ y implies z•x ≤ z•y and x•z ≤ y•z for all x, y, z in S.