SemiBase

A certified basis of 18 identities

This list of identities is a basis, proved in Lean, of 2 semigroups of order six, all of which generate the variety V[5635]. Removing the identities that follow from the others leaves 3 identities (Vampire); the variety page shows the shortest known basis.

Identifier sb-75737d6223881171 in the data of the bases-min seal.

Certified for

The identities

  1. x³ ≈ x⁴
  2. x³y ≈ xyx
  3. x²y ≈ x²y²
  4. xyx ≈ xyx²
  5. xy² ≈ xy³
  6. x²yxy ≈ xyx
  7. xyx ≈ xyxyx
  8. xyx ≈ xy²xy
  9. xyz ≈ xyz²
  10. x²yz ≈ x²zy
  11. xy²z ≈ xzyz
  12. xyxyz ≈ xyxz
  13. xyxz ≈ xyxzx
  14. xyxz ≈ xyxzy
  15. xyxz ≈ xy²xz
  16. xyxz ≈ xyzxy
  17. xyxz ≈ xyzxz
  18. xyxz ≈ xyzyx