| 释义 |
Ricci Math.|ˈriːtʃɪ|
[Name of C. G. Ricci (1853–1925), Italian mathematician.]
Ricci tensor: a symmetric second-order tensor obtained by contracting the Riemann–Christoffel tensor.
1923Veblen & Thomas in Trans. Amer. Math. Soc. XXV. 554 This we shall call the Ricci tensor because it reduces to the tensor studied by Ricci for the case of the Riemann geometry. 1926L. P. Eisenhart Riemannian Geom. i. 22 The Ricci tensor..was first considered by Ricci who gave it a geometrical interpretation in case gij is the fundamental tensor of a Riemann space. 1967Condon & Odishaw Handbk. Physics (ed. 2) ii. vi. 50/1 The vanishing of the Ricci tensor does not imply the vanishing of the Riemann–Christoffel tensor and consequently does not insure the Minkowski character of Einstein space–time in the large. 1974Nature 5 Apr. 472/1 The precise mathematical quantity which describes the curvature of space–time is known as the Ricci tensor Rjk, which is a 4 × 4 array of numbers defined at each point of space–time. |