| Up: | Monoids with two generators and two relations |
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| Σ | # | Presentation | Description | Related |
|---|---|---|---|---|
| 4 | 3 | ⟨a, b | ab=1, ba=1⟩ | Isomorphic to ℤ | 601 iso |
| 8 | 486 | ⟨a, b | aabb=1, baba=1⟩ | Isomorphic to ℤ2 ⊕ ℤ | 28 iso |
| 10 | 6917 | ⟨a, b | ba=ab, aaabbb=1⟩ | Isomorphic to ℤ3 ⊕ ℤ | 6 iso |