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往復論法
Wikipedia definition
1. Back-and-forth methodIn mathematical logic, especially set theory and model theory, the back-and-forth method is a method for showing isomorphism between countably infinite structures satisfying specified conditions. In particular: It can be used to prove that any two countably infinite densely ordered sets (i.e. , linearly ordered in such a way that between any two members there is another) without endpoints are isomorphic. An isomorphism between linear orders is simply a strictly increasing bijection.
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