Important contributions to it were made by Bianchi, Beltrami, Christoffel, Schur, Voss, and others, and Ricci-Curbastro coordinated and extended the theory with the use of tensor analysis and his absolute calculus.
Mahalagang kontribusyon sa mga ito ay ginawa ng Bianchi, Beltrami, Christoffel, Schur, Voss, at iba pa, at Ricci-Curbastro koordinado at extended ang mga teorya sa paggamit ng tensor analysis at sa kanyang absolute calculus.