In mathematics, the Berry–Robbins problem asks whether there is a continuous map from configurations of n points in R3 to the flag manifoldU(n)/Tn that is compatible with the action of the symmetric group on n points. It was posed by Berry and Robbins in 1997,[1] and solved positively by Atiyah in 2000.[2][3]
^Atiyah, Michael (2000), "The geometry of classical particles", Surveys in differential geometry, Surv. Differ. Geom., VII, Int. Press, Somerville, MA, pp. 1–15, MR1919420