Topological spaces : from distance to neighborhood 2026-02-15T23:12:21+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Buskes, Gerard; Rooij, A. C. M. (Undergraduate texts in mathematics, 1997)