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Closure Systems

Introduction to Uniform Spaces

A uniform space is sort of halfway between a metric space and a topological space.

reference request - What happens if you strip everything but the "between" relation in metric spaces - MathOverflow

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soft question - Why does intersection always preserve \"closed\" structures? - Mathematics Stack Exchange

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combinatorics - Is the disjoint union of two Matroids a Matroid itself? - Mathematics Stack Exchange

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