Beltrán Felip, Antonio; Felipe Román, María José; Melchor, Carmen(Springer-Verlag, 2022-12)
[EN] A theorem of Z. Arad and E. Fisman establishes that if A and B are two non-trivial conjugacy classes of a finite group G such that either AB = A boolean OR B or AB = A(-1) boolean OR B, then G cannot be a non-abelian ...