In a group inverse of ab=inverse of b inverse of a

#General Linear group of invertible matrices, GL(2, Z7) is a group,
#GL(2, Z7) is a group
#Symmetric group of squares
#group theory
#algebra
#definition of group
#subgroup
#addition modulo
#cyclic group
#permutational group
#homomorphism
#isomorphism
#example
#Exercise #group theory
#algebra
#definition of group
#subgroup
#addition modulo
#cyclic group
#permutational group
#homomorphism
#isomorphism
#example
#Exercise