(n) :
a group within a larger group; a group whose members are some, but not all, of the members of a larger group; a subset H of a group G that is itself a group and has the same binary operation as G
(n) :
a group within a larger group; a group whose members are some, but not all, of the members of a larger group; a subset H of a group G that is itself a group and has the same binary operation as G