Kadu, Ganesh S.; Joshi, Vinayak; GONDE, SAMRUDDHA(Cambridge University Press, 2021-12)
We prove that the annihilating-ideal graph of a commutative semigroup with unity is, in general, not weakly perfect. This settles the conjecture of DeMeyer and Schneider [‘The annihilating-ideal graph of commutative ...