🌐EnglishEnglishDeutschEspañolFrançaisItalianoРусский中文日本語EntityQ9993851· pop 5· linked from 52 articlesweak formulationtheoremAvailable in 5 languagesEspañolFrançais日本語Italianovia Wikidata sitelinks · CC0Connectionslinear mapEntityInternational Standard Book NumberEntityCategoriesNumerical differential equationsPartial differential equationsTheorems in functional analysis