leanprover-community/mathlib4

Define a typeclass for GO-space

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#42,275 创建于 2026年7月30日

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good first issuet-topology

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描述

The definition of a GO-space can be found here: https://topology.pi-base.org/properties/P000154

Also prove the following lemmas:

  1. A linearly ordered space is a GO-space.
  2. A separable GO-space is hereditarily separable.
  3. Optional: other lemmas that you can find on https://topology.pi-base.org/properties/P000154.

This is mentioned in https://github.com/leanprover-community/mathlib4/pull/41918.

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