Small group number 139 of order 64

G is the group 64gp139

The Hall-Senior number of this group is 260.

G has 3 minimal generators, rank 3 and exponent 4. The centre has rank 1.

There are 5 conjugacy classes of maximal elementary abelian subgroups. Their ranks are: 3, 3, 3, 3, 3.

This cohomology ring calculation is complete.

Ring structure | Completion information | Koszul information | Restriction information | Poincaré series

Ring structure

The cohomology ring has 10 generators:

There are 27 minimal relations:

A minimal Gröbner basis for the relations ideal consists of this minimal generating set, together with the following redundant relation:

Completion information

This cohomology ring was obtained from a calculation out to degree 18. The cohomology ring approximation is stable from degree 10 onwards, and Benson's tests detect stability from degree 13 onwards.

This cohomology ring has dimension 3 and depth 2. Here is a homogeneous system of parameters:

The first 2 terms h1, h2 form a regular sequence of maximum length.

The first term h1 forms a complete Duflot regular sequence. That is, its restriction to the greatest central elementary abelian subgroup forms a regular sequence of maximal length.

Data for Benson's test:

Koszul information

A basis for R/(h1, h2, h3) is as follows.

A basis for AnnR/(h1, h2)(h3) is as follows.

Restriction information