2,851
edits
Changes
no edit summary
A [[subgroup]] ''N'' of a [[group]] ''G'' is a [[normal subgroup]], if one of the following equivalent conditions hold:
A [[subgroup]] ''N'' of a [[Group (mathematics)|group]] ''G'' is a '''normal subgroup''', if one of the following equivalent conditions holds:
# <math>a N = N a </math> for all <math> a \in G</math>
# <math>a N = N a </math> for all <math> a \in G</math>