A duality proof of a theorem of P. Hill

Randall R. Holmes
1995 Proceedings of the American Mathematical Society  
A duality argument is given to prove the equivalence of a recent theorem of P. Hill and the main step in Zippin's proof of Ulm's theorem.
doi:10.1090/s0002-9939-1995-1273497-3 fatcat:e7lmlqf5erelbd574dycazhbsu