Matroid 2.7.4
| Label | 2.7.4 |
|---|---|
| Id | r2_n7_00*0**0***0****0***** |
| Rank | 2 |
| n | 7 |
Basic invariants
Representability
| Characteristic set | not computed |
|---|---|
| Realizable | yes |
| Realizable char0 | not computed |
| Regular | no |
| Binary | no |
| Ternary | no |
| Quaternary | no |
| Graphic | no |
Realization space
Geometry
Other
| Char poly splits | not computed |
|---|---|
| Simplicial arrangement | yes |
| Realization space: n qbar components | 1 |
Tutte polynomial
\(T = x_{0}^{2} x_{1} + 4 x_{0} x_{1} + x_{1}^{5} + 2 x_{1}^{4} + 3 x_{1}^{3} + 4 x_{1}^{2}\)
Combinatorics
Computed on the fly from the id.
Bases (15)
{2,3} {2,4} {3,4} {2,5} {3,5} {4,5} {2,6} {3,6} {4,6} {5,6} {2,7} {3,7} {4,7} {5,7} {6,7}Non-bases (6)
{1,2} {1,3} {1,4} {1,5} {1,6} {1,7}Circuits (21)
{1} {2,3,4} {2,3,5} {2,4,5} {3,4,5} {2,3,6} {2,4,6} {3,4,6} {2,5,6} {3,5,6} {4,5,6} {2,3,7} {2,4,7} {3,4,7} {2,5,7} {3,5,7} {4,5,7} {2,6,7} {3,6,7} {4,6,7} {5,6,7}Flats by rank (8)
- rank 0 (1): {1}
- rank 1 (6): {1,2} {1,3} {1,4} {1,5} {1,6} {1,7}
- rank 2 (1): {1,2,3,4,5,6,7}
Hyperplanes (6)
{1,2} {1,3} {1,4} {1,5} {1,6} {1,7}Dual (rank 5)
Revlex encoding in this labeling (not canonicalized, so not linked): *****0****0***0**0*00
Bases: {1,4,5,6,7} {1,3,5,6,7} {1,2,5,6,7} {1,3,4,6,7} {1,2,4,6,7} {1,2,3,6,7} {1,3,4,5,7} {1,2,4,5,7} {1,2,3,5,7} {1,2,3,4,7} {1,3,4,5,6} {1,2,4,5,6} {1,2,3,5,6} {1,2,3,4,6} {1,2,3,4,5}
Loops: 1. Parallel classes of size > 1: none.
Downloads
- Record as JSON
- OSCAR:
matroid_from_revlex_basis_encoding("00*0**0***0****0*****", 2, 7)