哈斯图 ·下图中的关系图和哈斯图是等价的吗? 问题3:你能够较为正 式(形式化)地阐述 “一个哈斯图能够而 且仅仅能够表示一个 a 偏序关系”吗? Suppose S is a finite partially ordered set.Then the order on S is completely known once we know all pairs a,b in S such that a <b,that is,once we know the relation on S.This follows from the fact thatx <y if and only ifx<y or there exist elements a1,a2,...,am in S such that x《a1《a2《·《am《y哈斯图 • 下图中的关系图和哈斯图是等价的吗? a b c a b c 问题3:你能够较为正 式(形式化)地阐述 “一个哈斯图能够而 且仅仅能够表示一个 偏序关系”吗?