Canad. Math. Bull. 44(2001), 93-96
Printed: Mar 2001
A challenge by R.~Padmanabhan to prove by group theory the
commutativity of cancellative semigroups satisfying a particular
law has led to the proof of more general semigroup laws being
equivalent to quite simple ones.
20E10 - Quasivarieties and varieties of groups
20M07 - Varieties and pseudovarieties of semigroups