Need some notation explanation In group theories there are t

Need some notation explanation

In group theories, there are theormes like |G:H| = |G|/|H| what does this \":\" mean? what does diz whole G:H represent?

Solution

Solution

              In    Group   Theories   , we    have

             Quotient    of    the orders   |G| /|H|   is    equal   to   the index [G:H]

            where   [ G : H ]   represents   the   number   of   left cosets   of   H   in   G