GROUP OF ORDER 64 #46
GROUP #46
Cyclic(2) x Group(32)#26
The MAGMA library number for G is 253
GrpPC : G of order 64 = 2^6
PC-Relations:
G.1^2 = G.6,
G.3^2 = G.6,
G.4^2 = G.5,
G.5^2 = G.6,
G.2^G.1 = G.2 * G.6,
G.4^G.1 = G.4 * G.5,
G.4^G.2 = G.4 * G.5,
G.5^G.1 = G.5 * G.6,
G.5^G.2 = G.5 * G.6
The center of G is abelian of type
[ 2, 4 ]
.
The orders of the terms of the lower central series are
[ 64, 4, 2, 1 ]
.
The orders of the terms of the upper central series are
[ 1, 8, 16, 64 ]
.
The order of the Frattini subgroup is 4.
The exponent of G is 8.
G has 3 conjugacy classes
of maximal elementary abelian p-subgroups. The orders of the maximal
elementary abelian subgroups are
[ 8, 8, 8 ]
.
The orders of the centralizers of the maximal elementary
abelian subgroups are
[ 32, 16, 16 ]
.
The orders of the normalizers of the maximal elementary
abelian subgroups are
[ 64, 32, 32 ]
.
The cohomology ring of G is the quotient of a polynomial
ring in the variables
[
z,
y,
x,
w,
v
]
in degrees
[ 1, 1, 1, 1, 4 ]
, by the ideal generated by the relations
zw
+ yw
+ w2
,
z3
+ z2y
+ zx2
+ yx2
+ w3
.
The Hilbert series for the cohomology ring is
-t2 -t -1 / t5 -3t4+ 4t3
-4t2+ 3t -1.
Its numerator factors as
(
t2+t+1
)
.
Its denominator factors as
(
t-1
)3
(
t2+1
)
.
The Krull dimension of the cohomology ring is 3.
The cohomology ring is Cohen-Macaulay and the longest
regular sequence consists of the generators
z2
,
v
,
y4
+ x4
+ yx2w
+ yxw2
+ yw3
+ xw3
+ w4
.
Restrictions to Maximal Elementary Abelian
Subgroups
Subgroup E #1
Generated by
[ G.6, G.1 * G.2 * G.3 * G.5 * G.6, G.1 * G.2 ]
The cohomology ring of E is a polynomial ring in the
variables
z
,
y
,
x
.
The images of the generators of the cohomology of G
restricted to E are
z
+ y
,
z
+ y
,
y
,
0
,
z4
+ z2y2
+ z2x2
+ x4
in the cohomology of E.
The kernel of the restriction to E (Minimal Prime) of the
cohomology of G is generated by
z
+ y
,
w
.
Subgroup E #2
Generated by
[ G.2 * G.3 * G.4 * G.5 * G.6, G.6, G.1 * G.2 * G.3 * G.5 * G.6 ]
The cohomology ring of E is a polynomial ring in the
variables
z
,
y
,
x
.
The images of the generators of the cohomology of G
restricted to E are
y
,
z
+ y
,
z
+ y
,
z
,
z4
+ z2y2
+ z2x2
+ x4
in the cohomology of E.
The kernel of the restriction to E (Minimal Prime) of the
cohomology of G is generated by
z
+ x
+ w
,
y
+ x
.
Subgroup E #3
Generated by
[ G.2 * G.5 * G.6, G.6, G.1 * G.2 * G.3 * G.5 * G.6 ]
The cohomology ring of E is a polynomial ring in the
variables
z
,
y
,
x
.
The images of the generators of the cohomology of G
restricted to E are
y
,
z
+ y
,
y
,
0
,
z3y
+ z2y2
+ z2x2
+ x4
in the cohomology of E.
The kernel of the restriction to E (Minimal Prime) of the
cohomology of G is generated by
z
+ x
,
w
.
The nilradical of the cohomology of G is
generated by
z2
+ zy
+ zx
+ yx
+ w2
,
yw
+ xw
.
It is nilpotent of degree 2.
Restrictions to Maximal Subgroups
Maximal Subgroup H #1
Generated by
[ G.1 * G.2 * G.6, G.4, G.5, G.6, G.3 ]
.
The group H is abelian of type
[ 8, 2, 2 ]
The cohomology ring of H is a the quotient of
a polynomial ring in the variables
[
z,
y,
x,
w
]
, in degrees
[ 1, 1, 1, 2 ]
, by the ideal of relations
z2
.
The images of the generators of the cohomology of G
restricted to H are
y
,
y
,
z
+ x
,
z
,
zy3
+ y4
+ zyx2
+ y2w
+ x2w
+ w2
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
z
+ y
.
Maximal Subgroup H #2
Generated by
[ G.1 * G.3, G.4, G.5, G.6, G.2 * G.3 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number26
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.4 * $.5,
$.2^2 = $.5,
$.3^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.2 = $.4 * $.5
Generated by
[ G.4 * G.5, G.1 * G.3 * G.4, G.1 * G.2 * G.5 * G.6 ]
.
The images of the generators of the cohomology of G
restricted to H are
y
+ x
,
x
,
y
,
z
+ y
,
zy2x
+ zx3
+ x4
+ w
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
z
+ y
+ x
.
Maximal Subgroup H #3
Generated by
[ G.2 * G.4, G.5, G.6, G.1 * G.4, G.3 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number10
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.5,
$.2^2 = $.5,
$.3^$.2 = $.3 * $.5,
$.4^$.2 = $.4 * $.5
Generated by
[ G.2 * G.4, G.2 * G.3 * G.4 * G.5 * G.6, G.1 * G.4, G.1 * G.2 * G.5 * G.6 ]
of type
Cyclic(2) x AlmostExtraSpecial(16)
.
The images of the generators of the cohomology of G
restricted to H are
z
+ x
,
z
+ y
+ w
,
w
,
y
+ x
+ w
,
w4
+ v
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
z
+ y
+ w
.
Maximal Subgroup H #4
Generated by
[ G.1, G.4, G.5, G.6, G.2 * G.3 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number24
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.1 = $.4 * $.5,
$.4^$.2 = $.4 * $.5
Generated by
[ G.2 * G.3 * G.6, G.1 * G.4 * G.5, G.1 * G.2 * G.3 * G.5 ]
of type
Cyclic(2) x Semidihedral(16)
.
The images of the generators of the cohomology of G
restricted to H are
y
+ x
,
z
+ x
,
z
+ x
,
y
,
x4
+ v
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
y
+ x
.
Maximal Subgroup H #5
Generated by
[ G.5, G.6, G.2, G.1 * G.4, G.3 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number26
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.4 * $.5,
$.2^2 = $.5,
$.3^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.2 = $.4 * $.5
Generated by
[ G.1 * G.3 * G.4, G.1 * G.2 * G.3 * G.4 * G.5, G.3 ]
.
The images of the generators of the cohomology of G
restricted to H are
z
+ y
,
z
,
z
+ y
+ x
,
z
+ y
,
w
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
z
+ w
.
Maximal Subgroup H #6
Generated by
[ G.1, G.3 * G.4, G.5, G.6, G.2 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number26
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.4 * $.5,
$.2^2 = $.5,
$.3^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.2 = $.4 * $.5
Generated by
[ G.1 * G.3 * G.4 * G.5 * G.6, G.1 * G.2 * G.3 * G.4 * G.6, G.1 * G.2 * G.5 *
G.6 ]
.
The images of the generators of the cohomology of G
restricted to H are
z
+ y
+ x
,
z
+ x
,
z
+ y
,
z
+ y
,
zy2x
+ zx3
+ x4
+ w
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
x
+ w
.
Maximal Subgroup H #7
Generated by
[ G.1, G.2 * G.4, G.3 * G.4, G.5, G.6 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number25
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.5,
$.2^2 = $.4,
$.3^2 = $.4 * $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4 * $.5,
$.3^$.1 = $.3 * $.4,
$.4^$.1 = $.4 * $.5
Generated by
[ G.3 * G.4, G.2 * G.4 * G.5, G.1 * G.2 * G.4 ]
of type
Cyclic(2) x Quaternion(16)
.
The images of the generators of the cohomology of G
restricted to H are
y
,
z
+ y
,
x
,
z
+ y
+ x
,
x4
+ w
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
y
+ x
+ w
.
Maximal Subgroup H #8
Generated by
[ G.4, G.5, G.6, G.2, G.3 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number26
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.4 * $.5,
$.2^2 = $.5,
$.3^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.2 = $.4 * $.5
Generated by
[ G.2 * G.4, G.3, G.4 * G.6 ]
.
The images of the generators of the cohomology of G
restricted to H are
0
,
y
,
x
,
z
+ y
,
y2x2
+ w
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
z
.
Maximal Subgroup H #9
Generated by
[ G.3 * G.4, G.5, G.6, G.2, G.1 * G.4 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number23
GrpPC of order 32 = 2^5
PC-Relations:
$.2^2 = $.5,
$.3^2 = $.4 * $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.5,
$.3^$.1 = $.3 * $.4,
$.4^$.1 = $.4 * $.5
Generated by
[ G.3 * G.4, G.1 * G.2 * G.3 * G.6, G.2 ]
of type
Cyclic(2) x Dihedral(16)
.
The images of the generators of the cohomology of G
restricted to H are
y
,
z
+ y
,
y
+ x
,
x
,
z3y
+ z2y2
+ y4
+ z3x
+ z2yx
+ w2
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
z
+ x
+ w
.
Maximal Subgroup H #10
Generated by
[ G.2 * G.4, G.3 * G.4, G.5, G.6, G.1 * G.4 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number26
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.4 * $.5,
$.2^2 = $.5,
$.3^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.2 = $.4 * $.5
Generated by
[ G.2 * G.3 * G.5, G.1 * G.2 * G.3 * G.4 * G.6, G.1 * G.2 * G.5 * G.6 ]
.
The images of the generators of the cohomology of G
restricted to H are
z
+ x
,
z
+ y
+ x
,
z
+ y
,
z
,
zx3
+ yx3
+ x4
+ w
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
z
+ y
+ x
+ w
.
Maximal Subgroup H #11
Generated by
[ G.1 * G.3, G.4, G.5, G.6, G.2 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number24
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.1 = $.4 * $.5,
$.4^$.2 = $.4 * $.5
Generated by
[ G.1 * G.3 * G.5 * G.6, G.2 * G.4 * G.6, G.1 * G.2 * G.3 * G.5 * G.6 ]
of type
Cyclic(2) x Semidihedral(16)
.
The images of the generators of the cohomology of G
restricted to H are
y
+ x
,
z
+ x
,
y
+ x
,
z
,
y3x
+ y2x2
+ v
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
z
+ x
.
Maximal Subgroup H #12
Generated by
[ G.1, G.4, G.5, G.6, G.3 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number26
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.4 * $.5,
$.2^2 = $.5,
$.3^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.2 = $.4 * $.5
Generated by
[ G.1 * G.3 * G.4 * G.6, G.4, G.3 ]
.
The images of the generators of the cohomology of G
restricted to H are
y
,
0
,
y
+ x
,
z
+ y
,
w
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
y
.
Maximal Subgroup H #13
Generated by
[ G.1, G.4, G.5, G.6, G.2 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number26
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.4 * $.5,
$.2^2 = $.5,
$.3^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.2 = $.4 * $.5
Generated by
[ G.4 * G.5 * G.6, G.2 * G.4 * G.6, G.1 * G.2 * G.5 * G.6 ]
.
The images of the generators of the cohomology of G
restricted to H are
x
,
y
+ x
,
0
,
z
+ y
,
zy2x
+ y2x2
+ zx3
+ x4
+ w
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
x
.
Maximal Subgroup H #14
Generated by
[ G.1, G.5, G.6, G.2, G.3 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number10
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.5,
$.2^2 = $.5,
$.3^$.2 = $.3 * $.5,
$.4^$.2 = $.4 * $.5
Generated by
[ G.2 * G.5, G.1 * G.3, G.2 * G.3, G.1 * G.2 * G.5 * G.6 ]
of type
Cyclic(2) x AlmostExtraSpecial(16)
.
The images of the generators of the cohomology of G
restricted to H are
z
+ w
,
z
+ y
+ x
,
y
+ w
,
0
,
z2y2
+ zy3
+ z2yx
+ y2x2
+ zx3
+ y2xw
+ zx2w
+ x3w
+ zxw2
+ x2w2
+ zw3
+ xw3
+ v
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
w
.
Maximal Subgroup H #15
Generated by
[ G.1, G.2 * G.4, G.5, G.6, G.3 ]
.
The Group H is Isomorphic to the
Group of Order 32 Number26
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.4 * $.5,
$.2^2 = $.5,
$.3^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.2 = $.4 * $.5
Generated by
[ G.1, G.1 * G.2 * G.3 * G.4 * G.6, G.3 ]
.
The images of the generators of the cohomology of G
restricted to H are
z
+ y
,
z
,
z
+ x
,
z
,
z2y2
+ w
in the cohomology of H.
The kernel of the restriction to H of the
cohomology of G is generated by
y
+ w
.
The essential cohomology of G is zero.
Inflations from Maximal Quotient Groups
Maximal Quotient Group Q #1.
The kernel of the quotient is generated by
G.6
.
The Group Q is Isomorphic to the
Group of Order 32 Number8
GrpPC of order 32 = 2^5
PC-Relations:
$.3^$.1 = $.3 * $.5,
$.3^$.2 = $.3 * $.5,
$.4^$.3 = $.4 * $.5
of type
Abelian(2,2) x Dihedral(8)
.
The generators of G have images
[ pcy.3 * pcy.4 * pcy.5, pcy.2 * pcy.4, pcy.1, pcy.4 ]
in the quotient group.
The images of the generators of the cohomology of Q
inflated to G are
y
,
x
,
w
,
z
+ x
+ w
,
z2
+ zy
+ x2
+ w2
in the cohomology of G.
The kernel of the inflation to G of the
cohomology of Q is generated by
zy
+ yx
+ zw
+ xw
+ w2
+ v
,
zw2
+ yw2
+ xw2
+ w3
.
Maximal Quotient Group Q #2.
The kernel of the quotient is generated by
G.1 * G.2 * G.3 * G.5 * G.6
.
The Group Q is Isomorphic to the
Group of Order 32 Number26
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.4 * $.5,
$.2^2 = $.5,
$.3^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.2 = $.4 * $.5
.
The generators of G have images
[ pcy.1, pcy.3, pcy.2 * pcy.3, pcy.2 * pcy.4 ]
in the quotient group.
The images of the generators of the cohomology of Q
inflated to G are
w
,
z
+ y
,
y
+ x
,
zy3
+ zyx2
+ y3w
+ zx2w
+ v
in the cohomology of G.
The kernel of the inflation is zero.
Maximal Quotient Group Q #3.
The kernel of the quotient is generated by
G.1 * G.2 * G.3 * G.5
.
The Group Q is Isomorphic to the
Group of Order 32 Number26
GrpPC of order 32 = 2^5
PC-Relations:
$.1^2 = $.4 * $.5,
$.2^2 = $.5,
$.3^2 = $.5,
$.4^2 = $.5,
$.2^$.1 = $.2 * $.4,
$.4^$.2 = $.4 * $.5
.
The generators of G have images
[ pcy.1, pcy.3, pcy.2 * pcy.3, pcy.2 * pcy.4 * pcy.5 ]
in the quotient group.
The images of the generators of the cohomology of Q
inflated to G are
w
,
z
+ y
,
y
+ x
,
zy3
+ zyx2
+ y2x2
+ y3w
+ yx2w
+ v
in the cohomology of G.
The kernel of the inflation is zero.
Action of Automorphisms
The groups of outer automorphisms of G has order 128, and is generated by 7
elements.
Automorphism #1
The order of the class of the automorphism in the
outer automorphism group is 2.
The images of the generators of G are
G.1
G.2
G.3
G.4 * G.6
G.5
G.6
.
The images of the generators of the cohomology of G
under the map induced by the automorphism are
z
,
y
,
x
,
w
,
v
.
Automorphism #2
The order of the class of the automorphism in the
outer automorphism group is 2.
The images of the generators of G are
G.1 * G.6
G.2
G.3 * G.6
G.4 * G.6
G.5
G.6
.
The images of the generators of the cohomology of G
under the map induced by the automorphism are
z
,
y
,
x
,
w
,
v
.
Automorphism #3
The order of the class of the automorphism in the
outer automorphism group is 2.
The images of the generators of G are
G.1 * G.6
G.2 * G.6
G.3 * G.6
G.4 * G.6
G.5
G.6
.
The images of the generators of the cohomology of G
under the map induced by the automorphism are
z
,
y
,
x
,
w
,
y2x2
+ zx2w
+ yx2w
+ v
.
Automorphism #4
The order of the class of the automorphism in the
outer automorphism group is 2.
The images of the generators of G are
G.2 * G.3 * G.5 * G.6
G.1 * G.3 * G.5 * G.6
G.3
G.4
G.5
G.6
.
The images of the generators of the cohomology of G
under the map induced by the automorphism are
y
,
z
,
z
+ y
+ x
,
w
,
w4
+ v
.
Automorphism #5
The order of the class of the automorphism in the
outer automorphism group is 2.
The images of the generators of G are
G.1
G.2
G.3
G.1 * G.2 * G.3 * G.4 * G.5
G.5
G.6
.
The images of the generators of the cohomology of G
under the map induced by the automorphism are
z
+ w
,
y
+ w
,
x
+ w
,
w
,
w4
+ v
.
Automorphism #6
The order of the class of the automorphism in the
outer automorphism group is 2.
The images of the generators of G are
G.2 * G.3 * G.5 * G.6
G.2
G.1 * G.2 * G.5 * G.6
G.1 * G.2 * G.3 * G.4 * G.5
G.5
G.6
.
The images of the generators of the cohomology of G
under the map induced by the automorphism are
x
+ w
,
z
+ y
+ x
+ w
,
z
+ w
,
w
,
zy3
+ z3x
+ z2yx
+ zy2x
+ y3x
+ zyx2
+ y2x2
+ x4
+ y3w
+ z2xw
+ yx2w
+ x3w
+ v
.
Automorphism #7
The order of the class of the automorphism in the
outer automorphism group is 2.
The images of the generators of G are
G.2 * G.4 * G.5 * G.6
G.1 * G.4 * G.5
G.3
G.4 * G.5
G.5 * G.6
G.6
.
The images of the generators of the cohomology of G
under the map induced by the automorphism are
y
,
z
,
x
,
z
+ y
+ w
,
z3y
+ zy3
+ z2x2
+ y2x2
+ v
.
CHECKS
paramflag =
true
qregflagflag =
true
cmflag =
true
essflag =
true
centflag =
true
THE COMPUTATION IS COMPLETE