🌐EnglishEnglishDeutschEspañolFrançaisPolskiРусский한국어中文日本語EntityQ2361277· pop 8· linked from 19 articlesLusternik–Schnirelmann categoryinteger-valued homotopy invariant of spaces; the size of the minimal open cover consisting of contractible setsAvailable in 8 languagesEspañolDeutsch中文РусскийPolskiUkrainian한국어via Wikidata sitelinks · CC0ConnectionshomotopyEntitymathematicsEntityCategoriesAlgebraic topologyMorse theory