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• 05:48, 4 November 2021 蒋玉骅 talk contribs created page 偏序集 (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）∈...")