On Groups that Differ in One of Four Squares

Abstract For a subgroup T of a group G( ∘ ), letL ∘  (T) andR ∘  (T) denote the sets of all left and right cosets, respectively. This paper is concerned with finite groups G( ∘ ) andG ( * ), where the places in which the Cayley tables of the two groups differ is determined by subgroups S