constructible hierarchy造句

例句与造句

1. The constructible hierarchy, L is defined by transfinite recursion.
2. It states that if " X " is a transitive set and is an elementary submodel of some level of the constructible hierarchy L & alpha;, that is, ( X, \ in ) \ prec ( L _ \ alpha, \ in ), then in fact there is some ordinal \ beta \ leq \ alpha such that X = L _ \ beta.
3. It's difficult to find constructible hierarchy in a sentence. 用constructible hierarchy造句挺难的