A theorem of W. May on endomorphism rings of mixed modules from [4] is shown to be incorrect. A precise description is given of the class of modules for which the theorem remains valid, as well as a complete description of all possible counter-examples.
机构:
Natl Res Lobachevsky State Univ Nizhny Novgorod, Nizhnii Novgorod 603950, RussiaNatl Res Lobachevsky State Univ Nizhny Novgorod, Nizhnii Novgorod 603950, Russia