Variety V[7976]
The variety generated by [6, 7976]: all semigroups that satisfy every identity of [6, 7976]. 1 semigroup of order six generates it, and 1,314 semigroups of order six lie in it.
Shortest known basis
6 identities irredundant
- x² ≈ x³
- xyx ≈ xy²x
- xyx ≈ xyxyx
- x²y² ≈ x²y²x²y²
- x²y²x² ≈ y²x²y²x²
- xyxzx ≈ xzxyx
Irredundant: none of these identities follows from the others; for each, a semigroup satisfies the others but not it. Obtained from a certified basis by removing identities that follow from the others (Vampire). Shortest known, not known to be minimal.
Certified bases
- 6 identities, certified in Lean for 1 semigroup
Among the 505 varieties
- Directly above
- Directly below
A variety lies above another when it contains it. An inclusion holds when the basis of the smaller variety derives that of the larger one, proved by Vampire; it fails when a semigroup of order six lies in the one and not in the other.
Explore V[7976] in the inclusion graph, with everything above and below it.
Generated by 1 semigroup of order six
Contains 1,314 semigroups of order six
The semigroups of order six that satisfy the basis.