例句與造句

1. Thus the hyperarithmetic hierarchy is studied instead of the Borel hierarchy, and the analytical hierarchy instead of the projective hierarchy.
2. The jump can be iterated into transfinite ordinals : the sets for, where is the Church-Kleene ordinal, are closely related to the hyperarithmetic hierarchy.
3. This produces that hyperarithmetic hierarchy, which is the lightface analog of the Borel hierarchy . ( The finite levels of the hyperarithmetic hierarchy are known as the arithmetical hierarchy .)
4. This produces that hyperarithmetic hierarchy, which is the lightface analog of the Borel hierarchy . ( The finite levels of the hyperarithmetic hierarchy are known as the arithmetical hierarchy .)
5. For instance the x \ in \ mathbb { R } satisfying \ forall ( n \ in \ omega ) \ phi ( x, n ) with \ phi ( x, n ) quantifier free must be computable while the unique x \ in \ omega ^ { \ omega } satisfying a universal formula can be arbitrarily high in the hyperarithmetic hierarchy.
6. It's difficult to find hyperarithmetic hierarchy in a sentence. 用hyperarithmetic hierarchy造句挺難的