Obstructions to the smoothing of piecewise-differentiable homeomorphisms
Obstructions to the smoothing of piecewise-differentiable homeomorphisms
Since the publication in 1956 of John Milnor's fundamental paper [l ] in which he constructs differentiable structures on S7 nondiffeomorphic to the standard one, several further results concerning differ entiable structures have been obtained by Milnor, R. Thorn, and others. This paper unifies and extends some of these results …