Indebted
发表于 2025-3-30 08:22:24
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大漩涡
发表于 2025-3-30 14:40:30
https://doi.org/10.1007/978-3-322-90404-1Many mathematical propositions are expressed in terms of a natural number . for which they are either true or false. This expository paper surveys a collection of propositions .(.) which are true if and only if . ≤ 4.