Cohomology of group number 1472 of order 128

About the group Ring generators Ring relations Completion information Restriction maps Back to groups of order 128

General information on the group

  • The group has 4 minimal generators and exponent 4.
  • It is non-abelian.
  • It has p-Rank 4.
  • Its center has rank 3.
  • It has 2 conjugacy classes of maximal elementary abelian subgroups, which are all of rank 4.

Structure of the cohomology ring

General information

  • The cohomology ring is of dimension 4 and depth 3.
  • The depth coincides with the Duflot bound.
  • The Poincaré series is
    ( − 1) · (t3  +  t  +  1) · (t4  −  3·t3  −  t  −  1)
    (t  +  1)2 · (t  −  1)4 · (t2  +  1)3
  • The a-invariants are -∞,-∞,-∞,-4,-4. They were obtained using the filter regular HSOP of the Benson test.

About the group Ring generators Ring relations Completion information Restriction maps Back to groups of order 128

Ring generators

The cohomology ring has 16 minimal generators of maximal degree 5:

  1. a_1_0, a nilpotent element of degree 1
  2. a_1_1, a nilpotent element of degree 1
  3. b_1_2, an element of degree 1
  4. b_1_3, an element of degree 1
  5. a_3_1, a nilpotent element of degree 3
  6. a_3_8, a nilpotent element of degree 3
  7. b_3_5, an element of degree 3
  8. b_3_7, an element of degree 3
  9. b_3_9, an element of degree 3
  10. b_3_10, an element of degree 3
  11. b_3_11, an element of degree 3
  12. c_4_19, a Duflot regular element of degree 4
  13. c_4_20, a Duflot regular element of degree 4
  14. c_4_21, a Duflot regular element of degree 4
  15. b_5_31, an element of degree 5
  16. b_5_32, an element of degree 5

About the group Ring generators Ring relations Completion information Restriction maps Back to groups of order 128

Ring relations

There are 62 minimal relations of maximal degree 10:

  1. a_1_1·b_1_2 + a_1_12 + a_1_02
  2. b_1_2·b_1_3 + a_1_1·b_1_3 + a_1_12 + a_1_0·a_1_1
  3. a_1_0·b_1_3 + a_1_0·b_1_2 + a_1_12 + a_1_0·a_1_1 + a_1_02
  4. a_1_13 + a_1_0·a_1_12
  5. a_1_13 + a_1_02·a_1_1 + a_1_03
  6. a_1_12·b_1_3 + a_1_13 + a_1_03
  7. a_1_1·b_3_5 + a_1_1·a_3_1 + a_1_0·a_3_1
  8. b_1_2·a_3_1 + a_1_0·b_3_5 + a_1_1·a_3_1 + a_1_0·a_3_1
  9. b_1_3·a_3_1 + b_1_2·a_3_1 + a_1_1·b_3_7 + a_1_1·a_3_1 + a_1_0·a_3_1
  10. a_1_0·b_3_7 + a_1_1·a_3_1
  11. b_1_3·b_3_5 + b_1_3·a_3_1 + b_1_2·a_3_8 + a_1_0·b_3_9 + a_1_1·a_3_8 + a_1_1·a_3_1
       + a_1_0·a_3_8
  12. b_1_3·b_3_5 + b_1_2·b_3_10 + b_1_2·b_3_9 + b_1_2·b_3_7 + b_1_2·a_3_8 + a_1_1·b_3_9
       + a_1_1·a_3_8 + a_1_0·a_3_8 + a_1_0·a_3_1
  13. a_1_1·b_3_10 + a_1_0·a_3_8 + a_1_0·a_3_1
  14. b_1_2·a_3_8 + b_1_2·a_3_1 + a_1_0·b_3_10 + a_1_1·a_3_8 + a_1_1·a_3_1
  15. b_1_3·b_3_10 + b_1_3·a_3_8 + b_1_3·a_3_1 + b_1_2·a_3_8 + b_1_2·a_3_1 + a_1_0·a_3_8
       + a_1_0·a_3_1
  16. b_1_3·b_3_5 + b_1_2·b_3_11 + b_1_2·b_3_9 + b_1_2·b_3_7 + b_1_3·a_3_8 + b_1_3·a_3_1
       + a_1_1·b_3_9 + a_1_1·a_3_1 + a_1_0·a_3_8 + a_1_0·a_3_1
  17. b_1_3·a_3_8 + b_1_3·a_3_1 + b_1_2·a_3_8 + b_1_2·a_3_1 + a_1_1·b_3_11 + a_1_1·a_3_8
  18. b_1_2·a_3_8 + b_1_2·a_3_1 + a_1_0·b_3_11 + a_1_0·a_3_1
  19. a_1_02·b_3_5 + a_1_12·a_3_1
  20. a_1_12·b_3_9 + a_1_12·b_3_7 + a_1_02·a_3_8
  21. a_1_12·b_3_7 + a_1_02·b_3_9 + a_1_12·a_3_8
  22. a_3_8·b_3_5 + a_3_1·b_3_10 + a_3_1·b_3_5 + a_3_1·a_3_8 + a_3_12
  23. b_3_102 + b_3_9·b_3_10 + b_3_7·b_3_10 + a_3_8·b_3_9 + a_3_8·b_3_7 + a_3_8·b_3_5
       + a_3_1·b_3_9 + a_3_1·b_3_7 + a_3_1·b_3_5 + a_3_82 + a_3_1·a_3_8
  24. a_3_8·b_3_7 + a_3_8·b_3_5 + a_3_1·b_3_11 + a_3_1·b_3_7 + a_3_1·b_3_5 + a_3_1·a_3_8
  25. b_3_5·b_3_11 + b_3_5·b_3_10 + a_3_8·b_3_7 + a_3_1·b_3_7 + a_3_1·b_3_5 + a_3_1·a_3_8
       + a_3_12
  26. b_3_10·b_3_11 + b_3_9·b_3_10 + b_3_7·b_3_10 + a_3_8·b_3_9 + a_3_8·b_3_7 + a_3_1·b_3_9
       + a_3_1·b_3_7 + a_1_1·b_1_32·b_3_9
  27. b_3_9·b_3_10 + b_3_92 + b_3_7·b_3_10 + b_1_33·b_3_9 + b_1_33·b_3_7 + b_1_26
       + a_3_8·b_3_9 + a_3_8·b_3_7 + a_3_8·b_3_5 + a_3_1·b_3_9 + a_3_1·b_3_7 + a_3_1·b_3_5
       + a_1_1·b_1_32·b_3_9 + a_1_1·b_1_32·b_3_7 + a_3_1·a_3_8 + a_3_12 + c_4_20·b_1_22
       + c_4_19·b_1_32
  28. b_3_5·b_3_10 + b_3_5·b_3_9 + b_3_5·b_3_7 + a_3_1·b_3_9 + a_3_1·b_3_7 + a_3_12
       + c_4_20·a_1_0·b_1_2 + c_4_19·a_1_12 + c_4_19·a_1_0·a_1_1
  29. a_3_12 + c_4_20·a_1_12 + c_4_19·a_1_02
  30. a_3_1·b_3_5 + a_3_12 + c_4_19·a_1_0·b_1_2 + c_4_20·a_1_0·a_1_1 + c_4_19·a_1_0·a_1_1
  31. b_3_52 + b_1_23·b_3_9 + b_1_23·b_3_7 + a_3_12 + c_4_19·b_1_22 + c_4_20·a_1_02
       + c_4_19·a_1_12
  32. b_3_52 + b_1_23·b_3_9 + b_1_23·b_3_7 + a_3_1·b_3_7 + a_3_1·b_3_5 + a_1_1·b_1_32·b_3_7
       + c_4_19·b_1_22 + c_4_20·a_1_1·b_1_3 + c_4_19·a_1_0·b_1_2 + c_4_19·a_1_12
  33. b_3_9·b_3_10 + b_3_92 + b_3_7·b_3_10 + b_3_72 + b_3_52 + b_1_33·b_3_9 + b_1_23·b_3_9
       + b_1_23·b_3_7 + a_3_8·b_3_9 + a_3_8·b_3_7 + a_3_8·b_3_5 + a_3_1·b_3_9 + a_3_1·b_3_7
       + a_3_1·b_3_5 + a_3_1·a_3_8 + a_3_12 + c_4_20·b_1_32 + c_4_19·b_1_32
       + c_4_19·b_1_22 + c_4_19·a_1_02
  34. b_3_112 + b_3_9·b_3_10 + b_3_92 + b_3_7·b_3_10 + b_1_33·b_3_7 + b_1_23·b_3_9
       + b_1_23·b_3_5 + b_1_26 + a_3_8·b_3_9 + a_3_8·b_3_7 + a_3_8·b_3_5 + a_3_1·b_3_9
       + a_3_1·b_3_7 + a_3_1·b_3_5 + a_1_1·b_1_32·b_3_11 + a_1_1·b_1_32·b_3_9 + a_3_1·a_3_8
       + c_4_21·b_1_22 + c_4_19·b_1_32 + c_4_19·b_1_22
  35. b_3_5·b_3_10 + b_3_5·b_3_9 + b_3_5·b_3_7 + a_3_8·b_3_11 + a_3_8·b_3_7 + a_3_8·b_3_5
       + a_3_1·b_3_9 + a_3_1·b_3_5 + a_1_1·b_1_32·b_3_9 + c_4_21·a_1_0·b_1_2
       + c_4_19·a_1_0·b_1_2 + c_4_19·a_1_12 + c_4_19·a_1_0·a_1_1
  36. b_3_112 + b_3_9·b_3_10 + b_3_7·b_3_10 + b_1_33·b_3_9 + a_3_8·b_3_9 + a_3_8·b_3_7
       + a_3_8·b_3_5 + a_3_1·b_3_9 + a_3_1·b_3_7 + a_3_1·b_3_5 + a_1_1·b_1_32·b_3_11
       + a_1_1·b_1_32·b_3_7 + a_3_82 + a_3_1·a_3_8 + c_4_21·a_1_12 + c_4_19·a_1_12
       + c_4_19·a_1_02
  37. a_3_8·b_3_11 + a_3_8·b_3_10 + a_3_8·b_3_7 + a_3_1·b_3_7 + a_3_1·b_3_5
       + a_1_1·b_1_32·b_3_9 + a_3_1·a_3_8 + a_3_12 + c_4_19·a_1_0·b_1_2 + c_4_21·a_1_0·a_1_1
  38. b_3_52 + b_1_23·b_3_9 + b_1_23·b_3_7 + a_3_82 + c_4_19·b_1_22 + c_4_21·a_1_02
       + c_4_19·a_1_12 + c_4_19·a_1_02
  39. b_3_9·b_3_10 + b_3_7·b_3_10 + b_3_5·b_3_10 + b_1_2·b_5_31 + b_1_23·b_3_7 + b_1_23·b_3_5
       + b_1_26 + a_3_8·b_3_11 + a_3_8·b_3_10 + a_3_8·b_3_9 + a_3_8·b_3_7 + a_3_8·b_3_5
       + a_3_1·b_3_9 + a_1_1·b_1_32·b_3_11 + a_3_82 + a_3_1·a_3_8 + a_3_12 + c_4_19·b_1_22
       + c_4_21·a_1_1·b_1_3 + c_4_19·a_1_0·b_1_2 + c_4_19·a_1_12 + c_4_19·a_1_0·a_1_1
       + c_4_19·a_1_02
  40. b_3_112 + b_3_9·b_3_10 + b_3_7·b_3_10 + b_3_52 + b_1_33·b_3_9 + b_1_23·b_3_9
       + b_1_23·b_3_7 + a_3_8·b_3_9 + a_3_8·b_3_5 + a_3_1·b_3_9 + a_3_1·b_3_7 + a_1_1·b_5_31
       + a_1_1·b_1_32·b_3_9 + a_1_1·b_1_32·b_3_7 + c_4_19·b_1_22 + c_4_21·a_1_1·b_1_3
       + c_4_19·a_1_0·b_1_2
  41. b_3_112 + b_3_9·b_3_10 + b_3_7·b_3_10 + b_1_33·b_3_9 + a_3_8·b_3_11 + a_3_8·b_3_10
       + a_3_8·b_3_9 + a_3_1·b_3_9 + a_3_1·b_3_5 + a_1_1·b_1_32·b_3_11 + a_1_1·b_1_32·b_3_9
       + a_1_1·b_1_32·b_3_7 + a_1_0·b_5_31 + a_3_12 + c_4_19·a_1_0·b_1_2 + c_4_19·a_1_12
       + c_4_19·a_1_02
  42. b_3_112 + b_3_92 + b_3_7·b_3_11 + b_3_7·b_3_10 + b_3_72 + b_3_52 + b_1_3·b_5_31
       + b_1_33·b_3_11 + b_1_33·b_3_9 + b_1_33·b_3_7 + b_1_23·b_3_9 + b_1_23·b_3_7
       + a_3_8·b_3_11 + a_3_8·b_3_9 + a_3_8·b_3_5 + a_3_1·b_3_9 + a_3_1·b_3_7 + a_3_1·b_3_5
       + a_1_1·b_1_32·b_3_11 + a_1_1·b_1_32·b_3_9 + c_4_21·b_1_32 + c_4_19·b_1_32
       + c_4_19·b_1_22 + c_4_21·a_1_1·b_1_3 + c_4_19·a_1_12 + c_4_19·a_1_0·a_1_1
       + c_4_19·a_1_02
  43. b_3_112 + b_3_9·b_3_10 + b_3_7·b_3_10 + b_3_5·b_3_10 + b_3_5·b_3_9 + b_3_5·b_3_7
       + b_1_33·b_3_9 + b_1_2·b_5_32 + b_1_23·b_3_9 + b_1_26 + a_3_8·b_3_10 + a_3_8·b_3_9
       + a_3_8·b_3_5 + a_3_1·b_3_7 + a_1_1·b_1_32·b_3_9 + a_3_82 + a_3_1·a_3_8
       + c_4_21·a_1_1·b_1_3 + c_4_19·a_1_1·b_1_3 + c_4_19·a_1_12 + c_4_19·a_1_02
  44. a_3_8·b_3_11 + a_3_8·b_3_10 + a_3_1·b_3_5 + a_1_1·b_5_32 + a_1_1·b_1_32·b_3_11
       + a_1_1·b_1_32·b_3_7 + a_3_1·a_3_8 + a_3_12 + c_4_21·a_1_1·b_1_3 + c_4_19·a_1_1·b_1_3
       + c_4_19·a_1_0·b_1_2
  45. b_3_112 + b_3_9·b_3_10 + b_3_7·b_3_10 + b_3_5·b_3_10 + b_3_5·b_3_9 + b_3_5·b_3_7
       + b_1_33·b_3_9 + a_3_8·b_3_10 + a_3_8·b_3_9 + a_3_8·b_3_7 + a_3_1·b_3_5
       + a_1_1·b_1_32·b_3_11 + a_1_1·b_1_32·b_3_7 + a_1_0·b_5_32 + a_3_82 + a_3_1·a_3_8
       + c_4_19·a_1_0·b_1_2 + c_4_19·a_1_12
  46. b_3_112 + b_3_9·b_3_10 + b_3_7·b_3_11 + b_3_5·b_3_10 + b_3_5·b_3_9 + b_3_5·b_3_7
       + b_3_52 + b_1_3·b_5_32 + b_1_33·b_3_11 + b_1_33·b_3_7 + b_1_23·b_3_9 + b_1_23·b_3_7
       + a_3_8·b_3_10 + a_3_8·b_3_9 + a_3_8·b_3_7 + a_3_8·b_3_5 + a_3_1·b_3_7
       + a_1_1·b_1_32·b_3_11 + a_3_12 + c_4_21·b_1_32 + c_4_19·b_1_32 + c_4_19·b_1_22
       + c_4_19·a_1_12 + c_4_19·a_1_0·a_1_1
  47. a_1_1·a_3_1·b_3_9 + a_1_0·a_3_8·b_3_9 + a_1_02·b_5_31 + a_1_1·a_3_1·a_3_8
       + a_1_0·a_3_1·a_3_8 + c_4_21·a_1_02·a_1_1 + c_4_21·a_1_03 + c_4_20·a_1_02·a_1_1
  48. a_3_1·b_5_31 + a_1_1·b_1_3·b_3_7·b_3_9 + a_1_1·b_1_34·b_3_7 + c_4_21·a_1_1·b_3_7
       + c_4_20·a_1_1·b_3_11 + c_4_20·a_1_1·b_3_7 + c_4_20·a_1_1·b_1_33
       + c_4_19·a_1_0·b_3_10 + c_4_21·a_1_1·a_3_1 + c_4_21·a_1_0·a_3_1 + c_4_20·a_1_1·a_3_8
       + c_4_20·a_1_0·a_3_8 + c_4_19·a_1_0·a_3_8 + c_4_19·a_1_0·a_3_1
  49. b_3_5·b_5_31 + b_1_23·b_5_31 + b_1_25·b_3_7 + b_1_28 + a_1_1·b_1_3·b_3_7·b_3_9
       + a_1_1·b_1_34·b_3_7 + c_4_21·b_1_2·b_3_5 + c_4_20·b_1_2·b_3_5 + c_4_19·b_1_2·b_3_9
       + c_4_19·b_1_2·b_3_7 + c_4_19·b_1_24 + c_4_21·a_1_1·b_3_7 + c_4_21·a_1_0·b_3_10
       + c_4_21·a_1_0·b_3_9 + c_4_20·a_1_1·b_3_11 + c_4_20·a_1_1·b_3_7 + c_4_20·a_1_1·b_1_33
       + c_4_20·a_1_0·b_3_10 + c_4_20·a_1_0·b_3_9 + c_4_19·a_1_1·b_3_9 + c_4_19·a_1_1·b_3_7
       + c_4_19·a_1_0·b_3_9 + c_4_19·a_1_0·b_3_5 + c_4_21·a_1_1·a_3_1 + c_4_21·a_1_0·a_3_8
       + c_4_21·a_1_0·a_3_1 + c_4_20·a_1_1·a_3_1 + c_4_20·a_1_0·a_3_8 + c_4_19·a_1_1·a_3_1
       + c_4_19·a_1_0·a_3_1
  50. b_3_10·b_5_31 + b_1_22·b_3_5·b_3_7 + b_1_23·b_5_31 + b_1_25·b_3_7 + b_1_25·b_3_5
       + b_1_28 + a_3_8·b_5_31 + a_1_1·b_1_3·b_3_7·b_3_9 + a_1_1·b_1_34·b_3_7
       + a_1_0·a_1_1·a_3_1·a_3_8 + c_4_21·b_1_2·b_3_9 + c_4_21·b_1_2·b_3_7
       + c_4_21·b_1_2·b_3_5 + c_4_20·b_1_2·b_3_9 + c_4_20·b_1_2·b_3_7 + c_4_20·b_1_2·b_3_5
       + c_4_19·b_1_2·b_3_5 + c_4_21·a_1_1·b_3_9 + c_4_21·a_1_0·b_3_9 + c_4_20·a_1_1·b_3_11
       + c_4_20·a_1_1·b_3_9 + c_4_20·a_1_1·b_1_33 + c_4_20·a_1_0·b_3_9 + c_4_19·a_1_0·b_3_10
       + c_4_19·a_1_0·b_3_5 + c_4_21·a_1_1·a_3_1 + c_4_21·a_1_0·a_3_8 + c_4_20·a_1_1·a_3_1
       + c_4_20·a_1_0·a_3_8 + c_4_19·a_1_1·a_3_1 + c_4_19·a_1_0·a_3_8
  51. a_3_8·b_5_31 + a_1_1·b_1_3·b_3_9·b_3_11 + a_1_1·b_1_32·b_5_31 + a_1_1·b_1_34·b_3_11
       + c_4_21·a_1_1·b_3_11 + c_4_21·a_1_1·b_3_7 + c_4_21·a_1_1·b_1_33 + c_4_21·a_1_0·b_3_5
       + c_4_20·a_1_1·b_3_7 + c_4_20·a_1_0·b_3_5 + c_4_19·a_1_0·b_3_10 + c_4_19·a_1_0·b_3_5
       + c_4_21·a_1_1·a_3_8 + c_4_21·a_1_1·a_3_1 + c_4_21·a_1_0·a_3_1 + c_4_20·a_1_1·a_3_8
       + c_4_20·a_1_1·a_3_1 + c_4_20·a_1_0·a_3_8 + c_4_19·a_1_0·a_3_8 + c_4_19·a_1_0·a_3_1
  52. b_3_11·b_5_31 + b_1_32·b_3_9·b_3_11 + b_1_32·b_3_7·b_3_9 + b_1_33·b_5_31
       + b_1_35·b_3_11 + b_1_35·b_3_7 + b_1_22·b_3_5·b_3_7 + b_1_23·b_5_31 + b_1_25·b_3_7
       + b_1_25·b_3_5 + b_1_28 + a_3_8·b_5_31 + a_1_1·b_1_34·b_3_11
       + a_1_0·a_1_1·a_3_1·a_3_8 + c_4_21·b_1_3·b_3_11 + c_4_21·b_1_34 + c_4_21·b_1_2·b_3_9
       + c_4_21·b_1_2·b_3_7 + c_4_21·b_1_2·b_3_5 + c_4_20·b_1_3·b_3_11 + c_4_20·b_1_34
       + c_4_20·b_1_2·b_3_9 + c_4_20·b_1_2·b_3_7 + c_4_20·b_1_2·b_3_5 + c_4_19·b_1_2·b_3_5
       + c_4_21·a_1_1·b_3_9 + c_4_21·a_1_1·b_1_33 + c_4_21·a_1_0·b_3_9 + c_4_21·a_1_0·b_3_5
       + c_4_20·a_1_1·b_3_11 + c_4_20·a_1_1·b_3_9 + c_4_20·a_1_1·b_1_33 + c_4_20·a_1_0·b_3_9
       + c_4_20·a_1_0·b_3_5 + c_4_19·a_1_1·b_1_33 + c_4_19·a_1_0·b_3_5 + c_4_21·a_1_1·a_3_8
       + c_4_21·a_1_0·a_3_1 + c_4_20·a_1_0·a_3_1
  53. a_3_8·b_5_32 + a_3_8·b_5_31 + a_1_0·a_1_1·a_3_1·a_3_8 + c_4_21·a_1_0·b_3_10
       + c_4_20·a_1_1·b_3_11 + c_4_20·a_1_1·b_3_7 + c_4_20·a_1_0·b_3_5 + c_4_19·a_1_1·b_3_11
       + c_4_19·a_1_1·b_3_7 + c_4_21·a_1_1·a_3_8 + c_4_21·a_1_0·a_3_8 + c_4_20·a_1_1·a_3_8
       + c_4_19·a_1_1·a_3_1 + c_4_19·a_1_0·a_3_1
  54. a_3_1·b_5_32 + a_1_1·b_1_3·b_3_7·b_3_9 + a_1_1·b_1_34·b_3_7 + a_1_0·a_1_1·a_3_1·a_3_8
       + c_4_21·a_1_1·b_3_7 + c_4_21·a_1_0·b_3_5 + c_4_20·a_1_1·b_3_11 + c_4_20·a_1_1·b_1_33
       + c_4_19·a_1_1·b_3_7 + c_4_19·a_1_0·b_3_5 + c_4_21·a_1_0·a_3_1 + c_4_20·a_1_1·a_3_1
       + c_4_20·a_1_0·a_3_8 + c_4_20·a_1_0·a_3_1 + c_4_19·a_1_0·a_3_8 + c_4_19·a_1_0·a_3_1
  55. b_3_11·b_5_32 + b_3_11·b_5_31 + b_1_22·b_3_7·b_3_9 + b_1_22·b_3_5·b_3_7
       + b_1_23·b_5_31 + a_1_1·b_1_3·b_3_7·b_3_9 + a_1_1·b_1_34·b_3_9 + a_1_1·b_1_34·b_3_7
       + c_4_21·b_1_2·b_3_9 + c_4_21·b_1_2·b_3_7 + c_4_21·b_1_2·b_3_5 + c_4_21·b_1_24
       + c_4_20·b_1_3·b_3_11 + c_4_20·b_1_2·b_3_9 + c_4_20·b_1_2·b_3_7 + c_4_20·b_1_2·b_3_5
       + c_4_19·b_1_3·b_3_11 + c_4_19·b_1_2·b_3_5 + c_4_19·b_1_24 + c_4_21·a_1_1·b_3_11
       + c_4_21·a_1_1·b_3_9 + c_4_21·a_1_1·b_3_7 + c_4_21·a_1_0·b_3_10 + c_4_21·a_1_0·b_3_9
       + c_4_21·a_1_0·b_3_5 + c_4_20·a_1_1·b_3_9 + c_4_20·a_1_1·b_3_7 + c_4_20·a_1_0·b_3_9
       + c_4_20·a_1_0·b_3_5 + c_4_19·a_1_1·b_1_33 + c_4_19·a_1_0·b_3_10 + c_4_19·a_1_0·b_3_5
       + c_4_21·a_1_1·a_3_8 + c_4_21·a_1_1·a_3_1 + c_4_20·a_1_1·a_3_8 + c_4_20·a_1_1·a_3_1
       + c_4_20·a_1_0·a_3_1 + c_4_19·a_1_1·a_3_1 + c_4_19·a_1_0·a_3_1
  56. b_3_9·b_5_32 + b_3_9·b_5_31 + b_3_7·b_5_31 + b_1_32·b_3_7·b_3_9 + b_1_35·b_3_7
       + b_1_22·b_3_5·b_3_7 + b_1_23·b_5_31 + b_1_25·b_3_7 + a_1_1·b_1_34·b_3_9
       + a_1_1·b_1_34·b_3_7 + a_1_0·a_1_1·a_3_1·a_3_8 + c_4_21·b_1_3·b_3_7
       + c_4_21·b_1_2·b_3_9 + c_4_21·b_1_2·b_3_7 + c_4_21·b_1_2·b_3_5 + c_4_21·b_1_24
       + c_4_20·b_1_3·b_3_11 + c_4_20·b_1_3·b_3_9 + c_4_20·b_1_3·b_3_7 + c_4_20·b_1_34
       + c_4_20·b_1_2·b_3_9 + c_4_20·b_1_2·b_3_7 + c_4_20·b_1_2·b_3_5 + c_4_19·b_1_3·b_3_9
       + c_4_19·b_1_2·b_3_5 + c_4_19·b_1_24 + c_4_21·a_1_0·b_3_9 + c_4_20·a_1_1·b_3_9
       + c_4_20·a_1_0·b_3_10 + c_4_20·a_1_0·b_3_5 + c_4_19·a_1_1·b_3_11 + c_4_21·a_1_1·a_3_1
       + c_4_21·a_1_0·a_3_1 + c_4_20·a_1_1·a_3_8 + c_4_20·a_1_0·a_3_8 + c_4_19·a_1_0·a_3_1
  57. b_3_5·b_5_32 + b_1_22·b_3_5·b_3_7 + b_1_23·b_5_31 + b_1_25·b_3_9 + b_1_25·b_3_7
       + b_1_25·b_3_5 + b_1_28 + a_1_1·b_1_3·b_3_7·b_3_9 + a_1_1·b_1_34·b_3_7
       + c_4_21·b_1_24 + c_4_20·b_1_24 + c_4_21·a_1_1·b_3_7 + c_4_21·a_1_0·b_3_10
       + c_4_21·a_1_0·b_3_9 + c_4_21·a_1_0·b_3_5 + c_4_20·a_1_1·b_3_11 + c_4_20·a_1_1·b_1_33
       + c_4_19·a_1_1·b_3_7 + c_4_19·a_1_0·b_3_9 + c_4_21·a_1_1·a_3_1 + c_4_21·a_1_0·a_3_8
       + c_4_21·a_1_0·a_3_1 + c_4_20·a_1_1·a_3_8 + c_4_20·a_1_0·a_3_8 + c_4_20·a_1_0·a_3_1
       + c_4_19·a_1_1·a_3_1
  58. b_3_7·b_5_32 + b_1_32·b_3_7·b_3_9 + b_1_35·b_3_7 + b_1_22·b_3_7·b_3_9 + b_1_25·b_3_7
       + a_1_1·b_1_3·b_3_9·b_3_11 + a_1_1·b_1_34·b_3_9 + a_1_1·b_1_34·b_3_7
       + c_4_21·b_1_3·b_3_7 + c_4_20·b_1_3·b_3_11 + c_4_20·b_1_34 + c_4_19·b_1_3·b_3_7
       + c_4_20·a_1_1·b_3_11 + c_4_20·a_1_1·b_3_7 + c_4_20·a_1_0·b_3_5 + c_4_21·a_1_1·a_3_1
       + c_4_20·a_1_1·a_3_1 + c_4_19·a_1_1·a_3_8 + c_4_19·a_1_1·a_3_1
  59. b_3_10·b_5_32 + b_1_22·b_3_7·b_3_9 + b_1_25·b_3_7 + b_1_25·b_3_5 + b_1_28
       + a_3_8·b_5_31 + a_1_1·b_1_3·b_3_7·b_3_9 + a_1_1·b_1_34·b_3_7 + c_4_21·b_1_24
       + c_4_19·b_1_24 + c_4_21·a_1_1·b_3_7 + c_4_21·a_1_0·b_3_10 + c_4_20·a_1_1·b_3_7
       + c_4_20·a_1_1·b_1_33 + c_4_19·a_1_1·b_3_11 + c_4_19·a_1_0·b_3_10
       + c_4_21·a_1_1·a_3_1 + c_4_21·a_1_0·a_3_8 + c_4_21·a_1_0·a_3_1 + c_4_20·a_1_1·a_3_8
       + c_4_20·a_1_1·a_3_1 + c_4_20·a_1_0·a_3_8 + c_4_20·a_1_0·a_3_1 + c_4_19·a_1_1·a_3_8
       + c_4_19·a_1_0·a_3_1
  60. b_5_312 + b_1_34·b_3_7·b_3_9 + b_1_24·b_3_7·b_3_9 + b_1_25·b_5_31 + b_1_27·b_3_9
       + b_1_27·b_3_7 + b_1_210 + a_1_1·b_1_33·b_3_7·b_3_9 + a_1_1·b_1_34·b_5_31
       + c_4_21·b_1_23·b_3_9 + c_4_21·b_1_23·b_3_7 + c_4_21·b_1_26 + c_4_20·b_1_33·b_3_9
       + c_4_20·b_1_36 + c_4_20·b_1_23·b_3_9 + c_4_20·b_1_23·b_3_7 + c_4_19·b_1_36
       + c_4_19·b_1_23·b_3_7 + c_4_19·b_1_23·b_3_5 + c_4_21·a_1_1·b_1_35
       + c_4_20·a_1_1·b_1_32·b_3_11 + c_4_20·a_1_1·b_1_32·b_3_7 + c_4_19·a_1_1·b_1_35
       + c_4_212·b_1_32 + c_4_212·b_1_22 + c_4_202·b_1_32 + c_4_202·b_1_22
       + c_4_19·c_4_21·b_1_22 + c_4_19·c_4_20·b_1_22 + c_4_192·b_1_22
       + c_4_20·c_4_21·a_1_12 + c_4_20·c_4_21·a_1_02 + c_4_202·a_1_02
       + c_4_19·c_4_21·a_1_12 + c_4_19·c_4_21·a_1_02 + c_4_192·a_1_12
       + c_4_192·a_1_02
  61. b_5_322 + b_5_312 + b_1_24·b_3_7·b_3_9 + b_1_25·b_5_31 + b_1_27·b_3_7
       + b_1_27·b_3_5 + b_1_210 + c_4_21·b_1_23·b_3_9 + c_4_21·b_1_23·b_3_7
       + c_4_20·b_1_23·b_3_9 + c_4_20·b_1_23·b_3_7 + c_4_19·b_1_23·b_3_7
       + c_4_19·b_1_23·b_3_5 + c_4_19·b_1_26 + c_4_212·b_1_22 + c_4_202·b_1_32
       + c_4_202·b_1_22 + c_4_19·c_4_21·b_1_22 + c_4_19·c_4_20·b_1_22
       + c_4_192·b_1_32 + c_4_192·b_1_22 + c_4_212·a_1_02 + c_4_20·c_4_21·a_1_02
       + c_4_202·a_1_12 + c_4_202·a_1_02 + c_4_19·c_4_21·a_1_12
       + c_4_19·c_4_20·a_1_12 + c_4_19·c_4_20·a_1_02 + c_4_192·a_1_12
  62. b_5_31·b_5_32 + b_5_312 + b_1_22·b_3_7·b_5_31 + b_1_24·b_3_7·b_3_9
       + b_1_24·b_3_5·b_3_7 + b_1_25·b_5_31 + b_1_27·b_3_9 + b_1_27·b_3_5
       + a_1_1·b_1_33·b_3_9·b_3_11 + a_1_1·b_1_33·b_3_7·b_3_9 + a_1_1·b_1_36·b_3_9
       + c_4_21·b_1_23·b_3_5 + c_4_21·b_1_26 + c_4_20·b_1_3·b_5_31 + c_4_20·b_1_23·b_3_5
       + c_4_19·b_1_3·b_5_31 + c_4_19·b_1_23·b_3_7 + c_4_21·a_3_8·b_3_9 + c_4_21·a_3_1·b_3_9
       + c_4_21·a_1_1·b_1_32·b_3_11 + c_4_21·a_1_1·b_1_32·b_3_9
       + c_4_21·a_1_1·b_1_32·b_3_7 + c_4_21·a_1_0·b_5_31 + c_4_20·a_3_8·b_3_9
       + c_4_20·a_3_1·b_3_9 + c_4_20·a_1_1·b_5_31 + c_4_20·a_1_1·b_1_32·b_3_7
       + c_4_20·a_1_1·b_1_35 + c_4_19·a_1_1·b_1_32·b_3_11 + c_4_19·a_1_1·b_1_32·b_3_7
       + c_4_19·a_1_1·b_1_35 + c_4_21·a_3_1·a_3_8 + c_4_212·b_1_22 + c_4_202·b_1_22
       + c_4_19·c_4_21·b_1_22 + c_4_19·c_4_20·b_1_22 + c_4_192·b_1_22
       + c_4_212·a_1_1·b_1_3 + c_4_212·a_1_0·b_1_2 + c_4_202·a_1_1·b_1_3
       + c_4_202·a_1_0·b_1_2 + c_4_192·a_1_0·b_1_2 + c_4_212·a_1_12 + c_4_212·a_1_02
       + c_4_20·c_4_21·a_1_0·a_1_1 + c_4_202·a_1_0·a_1_1 + c_4_202·a_1_02
       + c_4_19·c_4_21·a_1_12 + c_4_19·c_4_20·a_1_12 + c_4_19·c_4_20·a_1_0·a_1_1
       + c_4_192·a_1_12 + c_4_192·a_1_0·a_1_1

About the group Ring generators Ring relations Completion information Restriction maps Back to groups of order 128

Data used for Benson′s test

  • Benson′s completion test succeeded in degree 10.
  • The completion test was perfect: It applied in the last degree in which a generator or relation was found.
  • The following is a filter regular homogeneous system of parameters:
    1. c_4_19, a Duflot regular element of degree 4
    2. c_4_20, a Duflot regular element of degree 4
    3. c_4_21, a Duflot regular element of degree 4
    4. b_1_32 + b_1_22, an element of degree 2
  • The Raw Filter Degree Type of that HSOP is [-1, -1, -1, 8, 10].
  • The filter degree type of any filter regular HSOP is [-1, -2, -3, -4, -4].

About the group Ring generators Ring relations Completion information Restriction maps Back to groups of order 128

Restriction maps

Restriction map to the greatest central el. ab. subgp., which is of rank 3

  1. a_1_0 → 0, an element of degree 1
  2. a_1_1 → 0, an element of degree 1
  3. b_1_2 → 0, an element of degree 1
  4. b_1_3 → 0, an element of degree 1
  5. a_3_1 → 0, an element of degree 3
  6. a_3_8 → 0, an element of degree 3
  7. b_3_5 → 0, an element of degree 3
  8. b_3_7 → 0, an element of degree 3
  9. b_3_9 → 0, an element of degree 3
  10. b_3_10 → 0, an element of degree 3
  11. b_3_11 → 0, an element of degree 3
  12. c_4_19 → c_1_24, an element of degree 4
  13. c_4_20 → c_1_24 + c_1_14, an element of degree 4
  14. c_4_21 → c_1_04, an element of degree 4
  15. b_5_31 → 0, an element of degree 5
  16. b_5_32 → 0, an element of degree 5

Restriction map to a maximal el. ab. subgp. of rank 4

  1. a_1_0 → 0, an element of degree 1
  2. a_1_1 → 0, an element of degree 1
  3. b_1_2 → 0, an element of degree 1
  4. b_1_3 → c_1_3, an element of degree 1
  5. a_3_1 → 0, an element of degree 3
  6. a_3_8 → 0, an element of degree 3
  7. b_3_5 → 0, an element of degree 3
  8. b_3_7 → c_1_22·c_1_3 + c_1_1·c_1_32 + c_1_12·c_1_3, an element of degree 3
  9. b_3_9 → c_1_22·c_1_3, an element of degree 3
  10. b_3_10 → 0, an element of degree 3
  11. b_3_11 → c_1_2·c_1_32, an element of degree 3
  12. c_4_19 → c_1_24 + c_1_1·c_1_33 + c_1_12·c_1_32, an element of degree 4
  13. c_4_20 → c_1_22·c_1_32 + c_1_24 + c_1_1·c_1_33 + c_1_14, an element of degree 4
  14. c_4_21 → c_1_2·c_1_33 + c_1_1·c_1_33 + c_1_12·c_1_32 + c_1_02·c_1_32 + c_1_04, an element of degree 4
  15. b_5_31 → c_1_22·c_1_33 + c_1_23·c_1_32 + c_1_24·c_1_3 + c_1_1·c_1_34
       + c_1_1·c_1_2·c_1_33 + c_1_12·c_1_2·c_1_32 + c_1_14·c_1_3 + c_1_02·c_1_33
       + c_1_04·c_1_3, an element of degree 5
  16. b_5_32 → c_1_23·c_1_32 + c_1_24·c_1_3 + c_1_1·c_1_34 + c_1_1·c_1_2·c_1_33
       + c_1_12·c_1_33 + c_1_12·c_1_2·c_1_32 + c_1_02·c_1_33 + c_1_04·c_1_3, an element of degree 5

Restriction map to a maximal el. ab. subgp. of rank 4

  1. a_1_0 → 0, an element of degree 1
  2. a_1_1 → 0, an element of degree 1
  3. b_1_2 → c_1_3, an element of degree 1
  4. b_1_3 → 0, an element of degree 1
  5. a_3_1 → 0, an element of degree 3
  6. a_3_8 → 0, an element of degree 3
  7. b_3_5 → c_1_33 + c_1_2·c_1_32 + c_1_22·c_1_3, an element of degree 3
  8. b_3_7 → c_1_33 + c_1_2·c_1_32 + c_1_22·c_1_3 + c_1_1·c_1_32 + c_1_12·c_1_3, an element of degree 3
  9. b_3_9 → c_1_2·c_1_32 + c_1_22·c_1_3 + c_1_0·c_1_32 + c_1_02·c_1_3, an element of degree 3
  10. b_3_10 → c_1_33 + c_1_1·c_1_32 + c_1_12·c_1_3 + c_1_0·c_1_32 + c_1_02·c_1_3, an element of degree 3
  11. b_3_11 → c_1_33 + c_1_1·c_1_32 + c_1_12·c_1_3 + c_1_0·c_1_32 + c_1_02·c_1_3, an element of degree 3
  12. c_4_19 → c_1_22·c_1_32 + c_1_24 + c_1_1·c_1_33 + c_1_12·c_1_32 + c_1_0·c_1_33
       + c_1_02·c_1_32, an element of degree 4
  13. c_4_20 → c_1_22·c_1_32 + c_1_24 + c_1_12·c_1_32 + c_1_14, an element of degree 4
  14. c_4_21 → c_1_1·c_1_33 + c_1_12·c_1_32 + c_1_02·c_1_32 + c_1_04, an element of degree 4
  15. b_5_31 → c_1_35 + c_1_2·c_1_34 + c_1_24·c_1_3 + c_1_1·c_1_34 + c_1_1·c_1_2·c_1_33
       + c_1_1·c_1_22·c_1_32 + c_1_12·c_1_2·c_1_32 + c_1_12·c_1_22·c_1_3
       + c_1_14·c_1_3 + c_1_0·c_1_2·c_1_33 + c_1_0·c_1_22·c_1_32 + c_1_02·c_1_33
       + c_1_02·c_1_2·c_1_32 + c_1_02·c_1_22·c_1_3 + c_1_04·c_1_3, an element of degree 5
  16. b_5_32 → c_1_35 + c_1_2·c_1_34 + c_1_22·c_1_33 + c_1_0·c_1_34 + c_1_02·c_1_33, an element of degree 5

About the group Ring generators Ring relations Completion information Restriction maps Back to groups of order 128


Simon A. King David J. Green
Fakultät für Mathematik und Informatik Fakultät für Mathematik und Informatik
Friedrich-Schiller-Universität Jena Friedrich-Schiller-Universität Jena
Ernst-Abbe-Platz 2 Ernst-Abbe-Platz 2
D-07743 Jena D-07743 Jena
Germany Germany
E-mail: simon dot king at uni hyphen jena dot de
Tel: +49 (0)3641 9-46184
Fax: +49 (0)3641 9-46162
Office: Zi. 3524, Ernst-Abbe-Platz 2
E-mail: david dot green at uni hyphen jena dot de
Tel: +49 3641 9-46166
Fax: +49 3641 9-46162
Office: Zi 3512, Ernst-Abbe-Platz 2

Last change: 25.08.2009