G is the group 64gp215
The Hall-Senior number of this group is 169.
G has 4 minimal generators, rank 4 and exponent 4. The centre has rank 2.
There are 3 conjugacy classes of maximal elementary abelian subgroups. Their ranks are: 4, 4, 4.
This cohomology ring calculation is complete.
Ring structure | Completion information | Koszul information | Restriction information | Poincaré series
The cohomology ring has 8 generators:
There are 9 minimal relations:
A minimal Gröbner basis for the relations ideal consists of this minimal generating set, together with the following redundant relations:
This cohomology ring was obtained from a calculation out to degree 12. The cohomology ring approximation is stable from degree 6 onwards, and Benson's tests detect stability from degree 6 onwards.
This cohomology ring has dimension 4 and depth 3. Here is a homogeneous system of parameters:
The first 3 terms h1, h2, h3 form a regular sequence of maximum length.
The first 2 terms h1, h2 form a complete Duflot regular sequence. That is, their restrictions to the greatest central elementary abelian subgroup form a regular sequence of maximal length.
Data for Benson's test:
A basis for R/(h1, h2, h3, h4) is as follows.
A basis for AnnR/(h1, h2, h3)(h4) is as follows.
(1 + 3t + 3t2 + 2t3 + 2t4 + t5) / (1 - t) (1 - t2)2 (1 - t4)