#23 ⟨a, b | ba=ab, bb=1⟩
Quick links
- Properties
- Staircase diagram
- Rewriting system
- Isomorphic instances
- Presentation has sum-of-sides 6
- Isomorphic to ℤ2 ⊕ ℕ
- Infinite cancellative commutative monoid
- Commutative Gröbner basis: ⟨a, b | b2=1⟩
- Enveloping group is isomorphic to ℤ2 ⊕ ℤ
- Inverses of generators:
- Group of units is isomorphic to ℤ2
- 2 Archimedian components:
- Reduction order:
- Left-to-right shortlex with a < b
- Certificate: derivations of all rewriting rules from the defining relations.
# ab:ba=ab,bb=1 ab
ba=ab
bb=1
The mapping is from the listed presentation's alphabet to the current rewriting system's alphabet.
17 total
| Σ | # | Presentation | Mapping |
| 6 | 89 | ⟨a, b | aa=1, aba=b⟩ | φ(a) = b, φ(b) = a |
| 8 | 1101 | ⟨a, b | aa=1, aaaba=b⟩ | φ(a) = b, φ(b) = a |
| 8 | 1173 | ⟨a, b | aa=1, aaab=ba⟩ | φ(a) = b, φ(b) = a |
| 8 | 1176 | ⟨a, b | aa=1, aaba=ab⟩ | φ(a) = b, φ(b) = a |
| 8 | 1242 | ⟨a, b | aa=1, aba=aab⟩ | φ(a) = b, φ(b) = a |
| 10 | 9661 | ⟨a, b | aa=1, aaaaaba=b⟩ | φ(a) = b, φ(b) = a |
| 10 | 9673 | ⟨a, b | aa=1, aaabaaa=b⟩ | φ(a) = b, φ(b) = a |
| 10 | 9933 | ⟨a, b | aa=1, aaaaab=ba⟩ | φ(a) = b, φ(b) = a |
| 10 | 9936 | ⟨a, b | aa=1, aaaaba=ab⟩ | φ(a) = b, φ(b) = a |
| 10 | 9945 | ⟨a, b | aa=1, aaabaa=ba⟩ | φ(a) = b, φ(b) = a |
| 10 | 10208 | ⟨a, b | aa=1, aaaab=aba⟩ | φ(a) = b, φ(b) = a |
| 10 | 10215 | ⟨a, b | aa=1, aaaba=aab⟩ | φ(a) = b, φ(b) = a |
| 10 | 10218 | ⟨a, b | aa=1, aaaba=baa⟩ | φ(a) = b, φ(b) = a |
| 10 | 10232 | ⟨a, b | aa=1, aabaa=aba⟩ | φ(a) = b, φ(b) = a |
| 10 | 10474 | ⟨a, b | aa=1, aaba=aaab⟩ | φ(a) = b, φ(b) = a |
| 10 | 10479 | ⟨a, b | aa=1, abaa=aaba⟩ | φ(a) = b, φ(b) = a |
| 10 | 10498 | ⟨a, b | aa=1, baaa=aaab⟩ | φ(a) = b, φ(b) = a |