偏序集

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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）∈R，就把它表示成a≤b。若在集合A上给定一个偏序关系≤，则称集合A按偏序关系≤构成一个偏序集合，集合A和偏序R一起称为偏序集

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