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关于作业hw7-ordering的一点小疑问 #5

Answered by hengxin
Martin7-1 asked this question in Q&A
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这是 “拟序” 与 “严格拟序” 之间的区别,类似于 “偏序” 与 “严格偏序” 之间的区别。但是,很多书籍都不会明确地说明自己指的到底是严格的版本还是非严格的版本。参见 wiki 页面: https://en.wikipedia.org/wiki/Preorder#Formal_definition。

总结:拟序,要求自反与传递;严格拟序,要求反自反与传递。没错,严格拟序与严格偏序是一样的。不过,严格偏序比严格拟序更常用。

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@hengxin
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