Commit 2026-08-25 15:52 bc4fc71b

feat(Topology): small inductive dimension does not increase under inducing maps (#42167) The small inductive dimension of a topological space does not increase under inducing maps; in particular, the dimension of a subspace is less or equal to that of the original space and the dimension is preserved by homeomorphisms. Story of this PR: I originally proved this (entirely by hand) for homeomorphisms, but @plp127 pointed out this can be improved. I then asked Codex (GPT 5.6 Sol high) to prove the generalisation. I reviewed the AI code carefully and golfed it slightly.