🌐EnglishEnglishBahasa IndonesiaDeutschEspañolFrançaisNederlandsPolskiPortuguêsSvenskaTiếng ViệtРусскийفارسی中文日本語EntityQ939272· pop 24· linked from 306 articlesincidence matrixmatrix that shows the relationship between two classes of objectsAvailable in 23 languagesEspañolFrançaisDeutsch日本語РусскийPortuguêsBasqueCatalanCroatianCzechGalicianConnectionsblock matrixEntityinvertible matrixEntityCategoriesAlgebraic graph theoryCombinatoricsGraph data structuresMatrices (mathematics)