GROUP OF ORDER 64 #80

GROUP #80

The MAGMA library number for G is 210

GrpPC : G of order 64 = 2^6 PC-Relations: G.2^2 = G.6, G.3^2 = G.5, G.4^2 = G.6, G.3^G.1 = G.3 * G.6, G.3^G.2 = G.3 * G.6, G.4^G.1 = G.4 * G.5, G.4^G.2 = G.4 * G.5, G.4^G.3 = G.4 * 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, 1 ] .
The orders of the terms of the upper central series are [ 1, 8, 64 ] .
The order of the Frattini subgroup is 4.
The exponent of G is 4.
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, 64, 64 ] .

The cohomology ring of G is the quotient of a polynomial ring in the variables
[ z, y, x, w, v, u, t ] in degrees [ 1, 1, 1, 1, 3, 4, 4 ] , by the ideal generated by the relations
y2 + zx + yx + xw + w2 ,
x2 + zw + yw ,
z2x ,
z2w + zxw + yxw + zw2 + yw2 + xw2 + w3 ,
zxv + yxv + xwv ,
yxw4 + zw5 + yw5 + xw5 + w6 + z2yv + zywv + zwu + ywu + z2t + zxt + yxt + zwt + ywt + xwt + v2 .


The Hilbert series for the cohomology ring is
-t4 -t2 -t -1 / t7 -3t6+ 5t5 -7t4+ 7t3 -5t2+ 3t -1.
Its numerator factors as ( t4+t2+t+1 ) .
Its denominator factors as ( t-1 )3 ( t2+1 )2 .

The Krull dimension of the cohomology ring is 3.
The longest regular sequence consists of the generators u , t .
A homogeneous set of parameters is the set u , t , z4 + z3y + zyxw + zyw2 + zw3 + yw3 + xw3 + w4 + wv of degrees [ 4, 4, 4 ] .

The hypercohomolgy spectral sequence has E2 term:

ROW (1) : [] [] [ zx+ yx+ xw ] [ zxw+ yxw+ xw2, zyx+ zxw ] [ zyxw+ yxw2+ xw3 ]
ROW (0) : [1] [ y, z, x, w ] [ zy, z2, yx, yw, zx, zw, xw, w2 ] [ zw2, xw2, w3, z2y, z3, zyx, zyw, yxw, yw2, zxw, v ] [ zyw2, zv, yxw2, xv, yw3, wv, zw3, z3y, xw3, w4, zyxw, yv ] [ w5, zyv, z2v, yxv, ywv, zwv, yxw3, xwv, yw4, w2v, xw4 ] [ yw5, w3v, z2yv, z3v, zywv, yxwv, yw2v, v2, xw2v ] [ yw3v, wv2, xw3v, w4v, yv2, zv2, yxw2v ] [ ywv2, w2v2, w5v, z2v2 ] [ yw2v2 ]


Restrictions to Maximal Elementary Abelian Subgroups

Subgroup E #1
Generated by [ G.6, G.5, G.2 * G.3 * G.4 * G.5 ]

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
0 ,
z ,
z ,
z ,
zy2 + zx2 ,
z4 + z2x2 + x4 ,
z4 + y4 + z2x2
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 ,
x + w .


Subgroup E #2
Generated by [ G.6, G.5, G.1 * G.2 * G.4 * 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
z ,
z ,
0 ,
z ,
z3 + z2y + zy2 ,
z2x2 + x4 ,
z2y2 + y4
in the cohomology of E.

The kernel of the restriction to E (Minimal Prime) of the cohomology of G is generated by
z + w ,
y + w ,
x .


Subgroup E #3
Generated by [ G.1 * G.5, G.6, G.5 ]

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 ,
0 ,
0 ,
0 ,
z2y + zy2 ,
z2x2 + x4 ,
z2y2 + y4
in the cohomology of E.

The kernel of the restriction to E (Minimal Prime) of the cohomology of G is generated by
y ,
x ,
w .


The nilradical of the cohomology of G is generated by
y + w , zw + xw + w2 .

It is nilpotent of degree 4.


Restrictions to Maximal Subgroups

Maximal Subgroup H #1 Generated by [ G.2, G.1, G.6, G.4, G.5 ] .

The Group H is Isomorphic to the Group of Order 32 Number14 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.4 * $.5, $.2^2 = $.4, $.2^$.1 = $.2 * $.5, $.3^$.2 = $.3 * $.5 Generated by [ G.1 * G.4 * G.6, G.4 * G.5 * G.6, G.1 * G.2 * G.4 * G.5 * G.6 ]

of type Cyclic(4) x Dihedral(8) .

The images of the generators of the cohomology of G restricted to H are
y + x ,
x ,
0 ,
z + y + x ,
x3 + zw + xw + zv + xv ,
y2w + x2w + w2 ,
zx3 + zxw + zxv + w2 + v2
in the cohomology of H.

The kernel of the restriction to H of the cohomology of G is generated by
x .


Maximal Subgroup H #2 Generated by [ G.2, G.6, G.4, G.5, G.1 * G.3 * G.6 ] .

The Group H is Isomorphic to the Group of Order 32 Number40 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.4 * $.5, $.2^2 = $.4 * $.5, $.3^2 = $.5, $.2^$.1 = $.2 * $.4, $.3^$.2 = $.3 * $.5 Generated by [ G.2 * G.4 * G.6, G.1 * G.2 * G.3 * G.4 * G.5, G.1 * G.2 * G.3 * G.5 * G.6 ] .

The images of the generators of the cohomology of G restricted to H are
z + y ,
z + y + x ,
z + y ,
y + x ,
zyx + y2x + w ,
yw + t ,
u
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 #3 Generated by [ G.1 * G.4, G.2, G.3, G.6, G.5 ] .

The Group H is Isomorphic to the Group of Order 32 Number41 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.5, $.2^2 = $.4 * $.5, $.2^$.1 = $.2 * $.4 * $.5, $.3^$.1 = $.3 * $.4, $.3^$.2 = $.3 * $.5 Generated by [ G.1 * G.2 * G.3 * G.4 * G.6, G.1 * G.2 * G.4 * G.5 * G.6, G.2 * G.3 ] .

The images of the generators of the cohomology of G restricted to H are
z + x ,
z + y + x ,
z + y ,
z + x ,
x3 + w + v + u ,
zw + t + s ,
zw + xv + s
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 #4 Generated by [ G.1 * G.4, G.2, G.3 * G.4, G.6, G.5 ] .

The Group H is Isomorphic to the Group of Order 32 Number38 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.4 * $.5, $.2^2 = $.5, $.2^$.1 = $.2 * $.4 * $.5, $.3^$.1 = $.3 * $.4, $.3^$.2 = $.3 * $.5 Generated by [ G.3 * G.4, G.1 * G.2 * G.4 * G.5 * G.6, G.1 * G.3 * G.6 ] .

The images of the generators of the cohomology of G restricted to H are
y + x ,
x ,
z + y ,
z + x ,
y3 + zyx + x3 + zw + yw + v + u ,
zxw + yxw + w2 + zv + t ,
zy2x + yxw + zv + t
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 #5 Generated by [ G.1, G.6, G.4, G.5, G.2 * G.3 * G.6 ] .

The Group H is Isomorphic to the Group of Order 32 Number38 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.4 * $.5, $.2^2 = $.5, $.2^$.1 = $.2 * $.4 * $.5, $.3^$.1 = $.3 * $.4, $.3^$.2 = $.3 * $.5 Generated by [ G.1 * G.2 * G.3 * G.4 * G.5 * G.6, G.1 * G.5 * G.6, G.4 * G.5 * G.6 ] .

The images of the generators of the cohomology of G restricted to H are
y + x ,
y ,
y ,
z + y ,
y3 + zw + xw + v + u ,
zyw + zxw + t ,
zy2x + yx3 + zxw + w2 + t
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 #6 Generated by [ G.2, G.3, G.1, G.6, G.5 ] .

The Group H is Isomorphic to the Group of Order 32 Number16 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.4 * $.5, $.2^2 = $.4, $.3^2 = $.5, $.3^$.1 = $.3 * $.5, $.3^$.2 = $.3 * $.5 Generated by [ G.2, G.1 * G.3 * G.6, G.2 * G.3 * G.6 ] .

The images of the generators of the cohomology of G restricted to H are
y ,
z + x ,
z + y ,
0 ,
z3 + yx2 + zw + yw + xw + v ,
z2w + w2 + u ,
z2w + zyw + zxw + w2 + zv + xv
in the cohomology of H.

The kernel of the restriction to H of the cohomology of G is generated by
w .


Maximal Subgroup H #7 Generated by [ G.6, G.4, G.5, G.1 * G.2, G.2 * G.3 * G.6 ] .

The Group H is Isomorphic to the Group of Order 32 Number14 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.4 * $.5, $.2^2 = $.4, $.2^$.1 = $.2 * $.5, $.3^$.2 = $.3 * $.5 Generated by [ G.1 * G.3 * G.4, G.2 * G.3 * G.4, G.2 * G.3 * G.6 ]

of type Cyclic(4) x Dihedral(8) .

The images of the generators of the cohomology of G restricted to H are
z ,
y + x ,
z + y + x ,
z + x ,
y3 + zyx + zx2 + x3 + zw + xw + yv ,
x4 + y2w + x2w + v2 ,
z2yx + zxw + x2w + zyv + y2v + w2 + v2
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 #8 Generated by [ G.2, G.3 * G.4, G.1, G.6, G.5 ] .

The Group H is Isomorphic to the Group of Order 32 Number14 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.4 * $.5, $.2^2 = $.4, $.2^$.1 = $.2 * $.5, $.3^$.2 = $.3 * $.5 Generated by [ G.3 * G.4, G.2 * G.5, G.1 * G.5 ]

of type Cyclic(4) x Dihedral(8) .

The images of the generators of the cohomology of G restricted to H are
x ,
z ,
y ,
y ,
y3 + zw + xw + zv + yv + xv ,
zy3 + z2yx + y2w + x2w + v2 ,
y2w + zxw + zyv + y2v + zxv + w2 + v2
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 #9 Generated by [ G.3, G.2 * G.4, G.1, G.6, G.5 ] .

The Group H is Isomorphic to the Group of Order 32 Number36 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.4, $.2^2 = $.4 * $.5, $.3^2 = $.4, $.2^$.1 = $.2 * $.4, $.3^$.2 = $.3 * $.5 Generated by [ G.3, G.2 * G.4, G.1 * G.2 * G.3 * G.4 * G.5 * G.6 ] .

The images of the generators of the cohomology of G restricted to H are
y ,
z + y ,
y + x ,
z + y ,
y3 + zyx + zx2 + yw + xw + xv ,
zy3 + y3x + z2x2 + w2 ,
zy3 + v2
in the cohomology of H.

The kernel of the restriction to H of the cohomology of G is generated by
y + w .


Maximal Subgroup H #10 Generated by [ G.2 * G.4, G.3 * G.4, G.1, G.6, G.5 ] .

The Group H is Isomorphic to the Group of Order 32 Number39 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.4 * $.5, $.2^2 = $.5, $.3^2 = $.5, $.2^$.1 = $.2 * $.4, $.3^$.2 = $.3 * $.5 Generated by [ G.2 * G.4, G.3 * G.4, G.1 * G.3 * G.4 * G.6 ] .

The images of the generators of the cohomology of G restricted to H are
z ,
x ,
z + y ,
z + y + x ,
z3 + zyx + yw + v ,
z4 + w2 ,
z4 + z2w + y2w + w2 + zv + u
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 #11 Generated by [ G.3, G.6, G.4, G.5, G.1 * G.2 ] .

The Group H is Isomorphic to the Group of Order 32 Number16 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.4 * $.5, $.2^2 = $.4, $.3^2 = $.5, $.3^$.1 = $.3 * $.5, $.3^$.2 = $.3 * $.5 Generated by [ G.3, G.1 * G.2 * G.3, G.4 ] .

The images of the generators of the cohomology of G restricted to H are
z ,
z ,
z + y ,
x ,
yx2 + zw + yw + xw + v ,
u ,
z4 + yx3 + z2w + zyw + zxw + w2 + zv + xv
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 #12 Generated by [ G.1 * G.4, G.3, G.2 * G.4, G.6, G.5 ] .

The group H is abelian of type [ 4, 4, 2 ]

The cohomology ring of H is a the quotient of a polynomial ring in the variables
[ z, y, x, w, v ] , in degrees [ 1, 1, 1, 2, 2 ] , by the ideal of relations
z2 , y2 .

The images of the generators of the cohomology of G restricted to H are
y ,
x ,
z + y + x ,
y + x ,
zyx + yx2 + x3 + zw + yw + xw + zv + yv + xv ,
x4 + x2v + v2 ,
zyx2 + zyw + yxw + zyv + yxv + x2v + w2
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 #13 Generated by [ G.1 * G.4, G.2 * G.4, G.3 * G.4, G.6, G.5 ] .

The Group H is Isomorphic to the Group of Order 32 Number15 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.3, $.2^2 = $.5, $.4^2 = $.5, $.4^$.2 = $.4 * $.5 Generated by [ G.1 * G.2 * G.6, G.2 * G.4, G.3 * G.4 ]

of type Cyclic(4) x Quaternion(8) .

The images of the generators of the cohomology of G restricted to H are
z ,
z + y ,
x ,
y + x ,
xw ,
x2w + w2 ,
zyx2 + zxw + v
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 #14 Generated by [ G.3, G.1, G.6, G.4, G.5 ] .

The Group H is Isomorphic to the Group of Order 32 Number41 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.5, $.2^2 = $.4 * $.5, $.2^$.1 = $.2 * $.4 * $.5, $.3^$.1 = $.3 * $.4, $.3^$.2 = $.3 * $.5 Generated by [ G.1, G.3 * G.4 * G.6, G.4 ] .

The images of the generators of the cohomology of G restricted to H are
x ,
0 ,
z ,
z + y ,
z2x + u ,
t ,
xv + t + s
in the cohomology of H.

The kernel of the restriction to H of the cohomology of G is generated by
y .


Maximal Subgroup H #15 Generated by [ G.2, G.3, G.6, G.4, G.5 ] .

The Group H is Isomorphic to the Group of Order 32 Number37 GrpPC of order 32 = 2^5 PC-Relations: $.1^2 = $.4, $.2^2 = $.4 * $.5, $.3^2 = $.4, $.2^$.1 = $.2 * $.4 * $.5, $.3^$.1 = $.3 * $.4, $.3^$.2 = $.3 * $.5 Generated by [ G.2, G.3 * G.4 * G.5 * G.6, G.2 * G.3 ] .

The images of the generators of the cohomology of G restricted to H are
0 ,
z + y ,
z + x ,
x ,
z2x + zyx + zw + yw + xw + v ,
w2 ,
y2w + zxw + yxw + w2 + u
in the cohomology of H.

The kernel of the restriction to H of the cohomology of G is generated by
z .


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.5 * G.6 .

The Group Q 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

of type Cyclic(2) x AlmostExtraSpecial(16) .

The generators of G have images [ pcy.1 * pcy.2 * pcy.3 * pcy.5, pcy.2, pcy.1 * pcy.4 * pcy.5, pcy.4 ] in the quotient group.

The images of the generators of the cohomology of Q inflated to G are
y + w ,
x + w ,
w ,
z + y ,
zy3 + zyxw + yx2w + yv + wv + u + t
in the cohomology of G.

The kernel of the inflation to G of the cohomology of Q is generated by
y2 + x2 + xw ,
x2w + xw2 .



Maximal Quotient Group Q #2.

The kernel of the quotient is generated by G.6 .

The Group Q 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

of type Cyclic(2) x AlmostExtraSpecial(16) .

The generators of G have images [ pcy.1 * pcy.2 * pcy.3 * pcy.4, pcy.1, pcy.3, pcy.4 ] in the quotient group.

The images of the generators of the cohomology of Q inflated to G are
x + w ,
w ,
y + w ,
z + w ,
yx3 + zyxw + yx2w + yv + xv + wv + t
in the cohomology of G.

The kernel of the inflation to G of the cohomology of Q is generated by
zy + y2 + zx + yx + x2 + zw + yw ,
yx2 + x3 + x2w .



Maximal Quotient Group Q #3.

The kernel of the quotient is generated by G.5 .

The Group Q 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

of type Cyclic(2) x AlmostExtraSpecial(16) .

The generators of G have images [ pcy.1 * pcy.3, pcy.2 * pcy.3 * pcy.5, pcy.1 * pcy.4 * pcy.5, pcy.4 ] in the quotient group.

The images of the generators of the cohomology of Q inflated to G are
y + w ,
x ,
x + w ,
z + y ,
u
in the cohomology of G.

The kernel of the inflation to G of the cohomology of Q is generated by
y2 + yw + xw ,
x2w .



The depth-essential cohomology of G

The depth-essential cohomology of G is the intersection of the restrictions to the centralizers of the maximal elementary abelian p-subgroups of rank d+1 where d is the depth of the cohomology ring. For this group the depth is 2.



There are 3 conjugacy classes of subgroups which are centralizers of elementary abelian subgroups of rank 3. They are represented by the subgroups generated by


[ G.3 * G.6, G.2 * G.4 * G.6, G.1 * G.4 * G.5 * G.6 ]
[ G.4 * G.5, G.1 * G.2 * G.4 * G.6, G.1 * G.2 * G.4 * G.5 ]
[ G.2, G.2 * G.5 * G.6, G.1 * G.6 ] .

The depth-essential cohomology of G is generated as an ideal by
zx + yx + xw .

The annihilator of the depth-essential cohomology has dimension 2 .

The depth-essential cohomology is a free module over the polynomial subring Q of the cohomology ring of G generated by u , t .
The depth-essential cohomology is generated as a module over Q by the elements
[] [ zx+ yx+ xw ] [ zxw+ yxw+ xw2, zyx+ zxw ] [ zyxw+ yxw2+ xw3 ]



Action of Automorphisms

The groups of outer automorphisms of G has order 64, and is generated by 6 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

The images of the generators of the cohomology of G under the map induced by the automorphism are
z ,
y ,
x ,
w ,
y2w + w3 + v ,
u ,
zy3 + zyw2 + t .

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

The images of the generators of the cohomology of G under the map induced by the automorphism are
z ,
y ,
x ,
w ,
xw2 + v ,
u ,
zy3 + zyxw + yx2w + z2w2 + t .

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

The images of the generators of the cohomology of G under the map induced by the automorphism are
z ,
y ,
x ,
w ,
y2w + w3 + v ,
u ,
zy3 + zyw2 + t .

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

The images of the generators of the cohomology of G under the map induced by the automorphism are
z ,
y ,
x ,
w ,
y2w + w3 + v ,
u ,
zy3 + zyw2 + t .

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

The images of the generators of the cohomology of G under the map induced by the automorphism are
z ,
y ,
x ,
w ,
z2y + z2w + y2w + w3 + v ,
u ,
zy3 + zyw2 + t .

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

The images of the generators of the cohomology of G under the map induced by the automorphism are
z ,
z + w ,
x ,
z + y ,
z3 + v ,
u ,
z3y + y3w + yx2w + t .


CHECKS

paramflag = true
qregflagflag = true
cmflag = false
essflag = true
centflag = true

THE COMPUTATION IS COMPLETE