离散关系的问题!There are no common links found on both web page a a
离散关系的问题! There are no common links found on both web page a and web page b on the set of all web pages.为什么他们的关系是symmetric 和 irreflexive x=正负y on the set of all real numbers 为什么他们的关系是transitive symmetric 而不是irreflexive,antisymmetric 和 asymmetric?