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산술 위계 (비교)

r1 ➤ r2
1[Include(틀:가져옴,O=오메가, C=[[https://creativecommons.org/licenses/by-nc-sa/3.0/deed.ko|CC BY-NC-SA 3.0]], L=[[https://archive.ph/96kNT|링크]])[분류:가져온 문서/오메가]]
4== 정의 ==
9* [math(\phi)]가 [math(\Pi^0_n)]이면 [math(\exists x_1\cdots\exists x_n \phi)]는 [math(\Sigma^0_{n+1})]이다.
10
11[Include(틀:가져옴,O=오메가, C=[[https://creativecommons.org/licenses/by-nc-sa/3.0/deed.ko|CC BY-NC-SA 3.0]], L=[[https://archive.ph/96kNT|링크]])]