leanprover-community/mathlib4

Define a typeclass for GO-space

Offen

#42.275 geöffnet am 30.07.2026

 (1 Kommentar) (1 Reaktion) (0 zugewiesene Personen)Lean (1.592 Forks)github user discovery
good first issuet-topology

Repository-Metriken

Stars
 (3.869 Sterne)
PR-Merge-Metriken
 (Keine gemergten PRs in 30 T)

Beschreibung

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.

Contributor Guide