The notation or is often used to denote that is a normal subgroup of .
The kernel of any group homomorphism is a normal subgroup of . More surprisingly, the converse is also true: any normal subgroup is the kernel of some homomorphism (one of these being the projection map , where is the quotient group).
|Date of creation||2013-03-22 12:08:07|
|Last modified on||2013-03-22 12:08:07|
|Last modified by||djao (24)|