Last Updated
：2025/12/03
underlying set
（ plural ）
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(topology) A set of points
upon which a topology is built, thereby yielding a topological space. / (algebra) A set upon which some operations are defined, thereby yielding an algebraic structure.
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underlying set
To define a topology, start with the underlying set and then specify which subsets are open.
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To define a topology, start with the underlying set and then specify which subsets are open.
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