<s>
In	O
mathematics	O
,	O
especially	O
the	O
field	O
of	O
group	O
theory	O
,	O
the	O
Parker	B-Algorithm
vector	I-Algorithm
is	O
an	O
integer	O
vector	O
that	O
describes	O
a	O
permutation	B-Algorithm
group	I-Algorithm
in	O
terms	O
of	O
the	O
cycle	O
structure	O
of	O
its	O
elements	O
.	O
</s>
<s>
The	O
Parker	B-Algorithm
vector	I-Algorithm
P	O
of	O
a	O
permutation	B-Algorithm
group	I-Algorithm
G	O
acting	O
on	O
a	O
set	O
of	O
size	O
n	O
,	O
is	O
the	O
vector	O
whose	O
kth	O
component	O
for	O
k	O
=	O
1	O
,	O
...	O
,	O
n	O
is	O
given	O
by	O
:	O
</s>
<s>
The	O
Parker	B-Algorithm
vector	I-Algorithm
can	O
assist	O
in	O
the	O
recognition	O
of	O
Galois	O
groups	O
.	O
</s>
