SemiBase

A certified basis of 29 identities

This list of identities is a basis, proved in Lean, of 3 semigroups of order six, all of which generate the variety V[338]. Removing the identities that follow from the others leaves 3 identities (Vampire); the variety page shows the shortest known basis.

Identifier sb-a75b5dec878ec596 in the data of the bases-min seal.

Certified for

The identities

  1. x³ ≈ x²y
  2. x³ ≈ xy²
  3. x³ ≈ yx²
  4. x³ ≈ y²x
  5. x³ ≈ y³
  6. x²y ≈ xy²
  7. x²y ≈ yx²
  8. x²y ≈ y²x
  9. xy² ≈ yx²
  10. x³ ≈ y²z
  11. x³ ≈ yz²
  12. x²y ≈ x²z
  13. x²y ≈ xz²
  14. x²y ≈ y²z
  15. x²y ≈ yz²
  16. x²y ≈ zx²
  17. x²y ≈ zy²
  18. x²y ≈ z²y
  19. xy² ≈ xz²
  20. xy² ≈ yz²
  21. xy² ≈ zy²
  22. xyz ≈ zyx
  23. x²y ≈ z²t
  24. x²y ≈ zt²
  25. xy² ≈ zt²
  26. x³ ≈ yztu
  27. x²y ≈ ztuv
  28. xy² ≈ ztuv
  29. xyzt ≈ uvws