🌐EnglishEnglishPortuguêsTiếng ViệtРусский日本語EntityQ4916482· pop 5· linked from 14 articlesBirkhoff polytopepolytopeAvailable in 5 languagesРусскийGreekTiếng ViệtUkrainianvia Wikidata sitelinks · CC0Connectionsdoubly stochastic matrixEntityInternational Standard Book NumberEntityCategoriesMatrices (mathematics)Polyhedral combinatorics