Closure Systems
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[(Up)](../../README.md#topics) | _See also: [Topology](../Topology/README.md#topology), [Matroid Theory](../Matroid%20Theory/README.md#matroid-theory)_

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### Web resources

[What happens if you strip everything but the "between" relation in metric spaces](https://mathoverflow.net/questions/356188/what-happens-if-you-strip-everything-but-the-between-relation-in-metric-spaces) ★

[Why does intersection always preserve \"closed\" structures?](https://math.stackexchange.com/questions/3602374/why-does-intersection-always-preserve-closed-structures) ★

_(in [Matroid Theory](../Matroid%20Theory/README.md#matroid-theory))_ [Topological matroids?](https://math.stackexchange.com/questions/960007/topological-matroids) ★


### Books

Introduction to Uniform Spaces (borrow with print disabilities @ [archive.org](https://archive.org/details/introductiontoun0000jame)) ★ [💭](commentary/cpressey.md#introduction-to-uniform-spaces)