hyperarithmetical set造句

例句与造句

1. Every arithmetical set is hyperarithmetical, but there are many other hyperarithmetical sets.
2. The definition of hyperarithmetical sets as \ Delta ^ 1 _ 1 does not directly depend on computability results.
3. A second, equivalent, definition shows that the hyperarithmetical sets can be defined using infinitely iterated Turing jumps.
4. This second definition also shows that the hyperarithmetical sets can be classified into a hierarchy extending the arithmetical hierarchy; the hyperarithmetical sets are exactly the sets that are assigned a rank in this hierarchy.
5. This second definition also shows that the hyperarithmetical sets can be classified into a hierarchy extending the arithmetical hierarchy; the hyperarithmetical sets are exactly the sets that are assigned a rank in this hierarchy.
6. It's difficult to find hyperarithmetical set in a sentence. 用hyperarithmetical set造句挺难的