🌐EnglishEnglishItalianoРусский中文日本語EntityQ550628· pop 5· linked from 8 articlesKulkarni–Nomizu productproduct of two (0,2)-tensors as a (0,4)-tensorAvailable in 5 languages中文РусскийItalianoUkrainianvia Wikidata sitelinks · CC0ConnectionsRiemann curvature tensorEntityRicci curvatureEntityCategoriesDifferential geometryTensors