Ricci tensor
/ˈriːtʃi
/noun Mathematics
A set of components that describes part of the curvature of space-time. It is a symmetric second-order tensor.Grossmann gave Einstein the Riemann - Christoffel tensor which, together with the Ricci tensor which can be derived from it, were to become the major tools in the future theory.
Origin
1920s: named after Curbastro G. Ricci (1853–1925), Italian mathematician.