Brian Mere's Digital Garden
Normalizer
normalizer
Define
g
A
g
−
1
=
{
g
a
g
−
1
|
a
∈
A
}
. Define the
normalizer
of
A
in
G
to be the set
N
G
(
A
)
=
{
g
∈
G
|
g
A
g
−
1
=
A
}
.