absolute differential calculus

Noun

 * 1)  Ricci calculus; the rules of index notation and manipulation for tensors and tensor fields, as developed by Gregorio Ricci-Curbastro.
 * 2) * 1926 [Blackie & Son], Marjorie Long (translator),, The Absolute Differential Calculus (Calculus of Tensors), 1977, Dover.
 * 3) * 1931 [Blackie Company], A. J. McConnell, Applications of Tensor Analysis, 1957, Dover, page v,
 * The absolute differential calculus came into prominence as the instrument best fitted for dealing with the general theory of relativity and it has also been found indispensable for the differential geometry of hyperspaces.