The story
Named after Douglas Chapman and Herbert Robbins, who discovered it in 1951, independently of the original (1950) discovery by John Hammersley.
Etymology from Wiktionary, CC BY-SA 4.0.
Chapman-Robbins bound
Today it means: A lower bound on the variance of estimators of a deterministic parameter; a generalization of the Cramér-Rao bound, it is both tighter and more widely applicable, but usually harder to compute. Full definition →