Linked from
The 10 pages that link to Subspace topology, each with the reason it gives.
Boundary (topology)Related: A subset's boundary can change when its ambient space changes.
Basis (topology)Broader topic: Intersecting ambient basis members gives a basis for the subspace.
General topologyBroader topic: It explains how topological structure passes to subsets.
Excision theoremRelated: The excised set and the pair's subspaces carry their inherited topologies.