SemiBase

A certified basis of 11 identities

This list of identities is a basis, proved in Lean, of 4 semigroups of order six, all of which generate the variety V[12959]. Removing the identities that follow from the others leaves 4 identities (Vampire); the variety page shows the shortest known basis.

Identifier sb-81cafe3dd874edc6 in the data of the bases-min seal.

Certified for

The identities

  1. x² ≈ x³
  2. x²yx ≈ xyx
  3. xyx ≈ xyx²
  4. xyx ≈ xy²x
  5. xyx ≈ xyxyx
  6. xyxyz ≈ xyxz
  7. xyxzx ≈ xyzx
  8. xy²zx ≈ xyzx
  9. xyzx ≈ xyzyx
  10. xyzx ≈ xyz²x
  11. xyxzy ≈ xyzxy