A Characterization of Groups (Solved)
Summary: Suppose the semigroup S contains an element g such that (i) for each x in S there is some y in S such that gy = x, and (ii) for each x in S there is some y in S such that yx = g. Show that S is a group.
Classification: Primary, Algebra; Secondary, Abstract Algebra
Nandrupsvej 7 st. th.
DK-2000 Frederiksberg C