Revision history of "偏序集"

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  • curprev 05:48, 4 November 2021蒋玉骅 talk contribs 347 bytes +347 Created page with "设R是集合A上的一个关系,如果R是自反的、反对称的和可传递的,则称R是集合A的偏序关系,简称偏序,记作“≤”。对于(a,b)∈..."