🌐EnglishEnglishEspañolFrançaisItalianoPortuguêsTürkçeРусскийEntityQ5987493· pop 6· linked from 45 articlesRiemann invariantquantity that is constant along characteristic curves in a system of conservation equationsConnectionseigenvectors and eigenvaluesEntityhodographEntityCategoriesBernhard RiemannConservation equationsInvariant theoryPartial differential equations