International Journal of Mathematics and Mathematical Sciences
Volume 25 (2001), Issue 5, Pages 311-313
doi:10.1155/S0161171201004641
On Whitehead's inequality, nil [X,G]≤cat X
Martin Arkowitz
Mathematics Department, Dartmouth College, Hanover 03755, NH, USA
Abstract
A new proof of Whitehead's inequality, nil [X,G]≤cat X, is given.