🌐EnglishEnglishDeutschFrançaisSvenska한국어日本語EntityQ6516731· pop 6· linked from 25 articlesLefschetz hyperplane theoremtheorem that the inclusion between a projective variety and its hyperplane section induces isomorphisms of homology, cohomology or homotopy groups in low degreesAvailable in 6 languagesFrançaisDeutsch日本語Svenska한국어via Wikidata sitelinks · CC0ConnectionscohomologyEntityMorse theoryEntityCategoriesMorse theoryTheorems in algebraic geometryTheorems in algebraic topologyTopological methods of algebraic geometry