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# ab:aa=1,abbba=b b/a bbbbbbbbb=b ba=abbb aa=1
| 1 | a | b | ab | b2 | ab2 | b3 | ab3 | b4 | ab4 | b5 | ab5 | b6 | ab6 | b7 | ab7 | b8 | ab8 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | a | b | ab | b2 | ab2 | b3 | ab3 | b4 | ab4 | b5 | ab5 | b6 | ab6 | b7 | ab7 | b8 | ab8 |
| a | a | 1 | ab | b | ab2 | b2 | ab3 | b3 | ab4 | b4 | ab5 | b5 | ab6 | b6 | ab7 | b7 | ab8 | b8 |
| b | b | ab3 | b2 | ab4 | b3 | ab5 | b4 | ab6 | b5 | ab7 | b6 | ab8 | b7 | ab | b8 | ab2 | b | ab3 |
| ab | ab | b3 | ab2 | b4 | ab3 | b5 | ab4 | b6 | ab5 | b7 | ab6 | b8 | ab7 | b | ab8 | b2 | ab | b3 |
| b2 | b2 | ab6 | b3 | ab7 | b4 | ab8 | b5 | ab | b6 | ab2 | b7 | ab3 | b8 | ab4 | b | ab5 | b2 | ab6 |
| ab2 | ab2 | b6 | ab3 | b7 | ab4 | b8 | ab5 | b | ab6 | b2 | ab7 | b3 | ab8 | b4 | ab | b5 | ab2 | b6 |
| b3 | b3 | ab | b4 | ab2 | b5 | ab3 | b6 | ab4 | b7 | ab5 | b8 | ab6 | b | ab7 | b2 | ab8 | b3 | ab |
| ab3 | ab3 | b | ab4 | b2 | ab5 | b3 | ab6 | b4 | ab7 | b5 | ab8 | b6 | ab | b7 | ab2 | b8 | ab3 | b |
| b4 | b4 | ab4 | b5 | ab5 | b6 | ab6 | b7 | ab7 | b8 | ab8 | b | ab | b2 | ab2 | b3 | ab3 | b4 | ab4 |
| ab4 | ab4 | b4 | ab5 | b5 | ab6 | b6 | ab7 | b7 | ab8 | b8 | ab | b | ab2 | b2 | ab3 | b3 | ab4 | b4 |
| b5 | b5 | ab7 | b6 | ab8 | b7 | ab | b8 | ab2 | b | ab3 | b2 | ab4 | b3 | ab5 | b4 | ab6 | b5 | ab7 |
| ab5 | ab5 | b7 | ab6 | b8 | ab7 | b | ab8 | b2 | ab | b3 | ab2 | b4 | ab3 | b5 | ab4 | b6 | ab5 | b7 |
| b6 | b6 | ab2 | b7 | ab3 | b8 | ab4 | b | ab5 | b2 | ab6 | b3 | ab7 | b4 | ab8 | b5 | ab | b6 | ab2 |
| ab6 | ab6 | b2 | ab7 | b3 | ab8 | b4 | ab | b5 | ab2 | b6 | ab3 | b7 | ab4 | b8 | ab5 | b | ab6 | b2 |
| b7 | b7 | ab5 | b8 | ab6 | b | ab7 | b2 | ab8 | b3 | ab | b4 | ab2 | b5 | ab3 | b6 | ab4 | b7 | ab5 |
| ab7 | ab7 | b5 | ab8 | b6 | ab | b7 | ab2 | b8 | ab3 | b | ab4 | b2 | ab5 | b3 | ab6 | b4 | ab7 | b5 |
| b8 | b8 | ab8 | b | ab | b2 | ab2 | b3 | ab3 | b4 | ab4 | b5 | ab5 | b6 | ab6 | b7 | ab7 | b8 | ab8 |
| ab8 | ab8 | b8 | ab | b | ab2 | b2 | ab3 | b3 | ab4 | b4 | ab5 | b5 | ab6 | b6 | ab7 | b7 | ab8 | b8 |
| Σ | # | Presentation | Description | Related |
|---|---|---|---|---|
| 9 | 3387 | ⟨a, b | aa=1, abbbbb=b⟩ | Finite non-commutative monoid with 18 elements | 22 iso, 9 anti-iso |
| 10 | 5521 | ⟨a, b | aaab=1, bbbbbb=1⟩ | Isomorphic to ℤ18 | 33 iso |
| 10 | 6732 | ⟨a, b | aba=a, aaab=bb⟩ | Finite non-commutative monoid with 18 elements | |
| 10 | 6788 | ⟨a, b | aba=b, baab=aa⟩ | Finite non-commutative monoid with 18 elements | |
| 10 | 6795 | ⟨a, b | aba=b, bbbb=aa⟩ | Finite non-commutative monoid with 18 elements | |
| 10 | 7039 | ⟨a, b | bb=aa, aaaba=b⟩ | Finite non-commutative monoid with 18 elements | 2 iso |
| 10 | 8910 | ⟨a, b | aa=a, bbbbb=ab⟩ | Finite non-commutative monoid with 18 elements | 1 iso |
| 11 | 12187 | ⟨a, b | aaaa=ab, babb=b⟩ | Finite non-commutative monoid with 18 elements | 2 iso |
| 11 | 15797 | ⟨a, b | aab=bb, bbbba=a⟩ | Finite non-commutative monoid with 18 elements | |
| 11 | 16042 | ⟨a, b | aaa=ab, bbbb=ab⟩ | Finite non-commutative monoid with 18 elements | |
| 11 | 16043 | ⟨a, b | aaa=ab, bbbb=ba⟩ | Finite non-commutative monoid with 18 elements | |
| 11 | 16313 | ⟨a, b | aab=bb, baba=aa⟩ | Finite non-commutative monoid with 18 elements | |
| 11 | 18758 | ⟨a, b | aaa=a, bbbbbb=a⟩ | Isomorphic to ℕ(18 = 6) | |
| 11 | 18830 | ⟨a, b | aaa=b, bbbbbb=a⟩ | Isomorphic to ℕ(18 = 1) | |
| 11 | 18831 | ⟨a, b | aaa=b, bbbbbb=b⟩ | Isomorphic to ℕ(18 = 3) | |
| 11 | 19624 | ⟨a, b | aab=b, bbbba=aa⟩ | Finite non-commutative monoid with 18 elements | |
| 11 | 20914 | ⟨a, b | bb=aa, ababa=aa⟩ | Finite non-commutative monoid with 18 elements | 1 iso |
17 total
| Σ | # | Presentation | Mapping |
|---|---|---|---|
| 8 | 1192 | ⟨a, b | aa=1, abbb=ba⟩ | φ(a) = a, φ(b) = b |
| 8 | 1255 | ⟨a, b | aa=1, bbb=aba⟩ | φ(a) = a, φ(b) = b |
| 10 | 9685 | ⟨a, b | aa=1, aaabbba=b⟩ | φ(a) = a, φ(b) = b |
| 10 | 9725 | ⟨a, b | aa=1, abaabba=b⟩ | φ(a) = a, φ(b) = b |
| 10 | 9731 | ⟨a, b | aa=1, abababa=b⟩ | φ(a) = a, φ(b) = ab |
| 10 | 9957 | ⟨a, b | aa=1, aaabbb=ba⟩ | φ(a) = a, φ(b) = b |
| 10 | 9979 | ⟨a, b | aa=1, aabbba=ab⟩ | φ(a) = a, φ(b) = b |
| 10 | 9995 | ⟨a, b | aa=1, abaabb=ba⟩ | φ(a) = a, φ(b) = b |
| 10 | 9999 | ⟨a, b | aa=1, ababab=ba⟩ | φ(a) = a, φ(b) = ab |
| 10 | 10011 | ⟨a, b | aa=1, abbaab=ba⟩ | φ(a) = a, φ(b) = b |
| 10 | 10221 | ⟨a, b | aa=1, aaaba=bbb⟩ | φ(a) = a, φ(b) = b |
| 10 | 10254 | ⟨a, b | aa=1, aabbb=aba⟩ | φ(a) = a, φ(b) = b |
| 10 | 10291 | ⟨a, b | aa=1, abbba=aab⟩ | φ(a) = a, φ(b) = b |
| 10 | 10312 | ⟨a, b | aa=1, baabb=aba⟩ | φ(a) = a, φ(b) = b |
| 10 | 10320 | ⟨a, b | aa=1, babab=aba⟩ | φ(a) = a, φ(b) = ab |
| 10 | 10493 | ⟨a, b | aa=1, abbb=aaba⟩ | φ(a) = a, φ(b) = b |
| 10 | 10501 | ⟨a, b | aa=1, baaa=abbb⟩ | φ(a) = a, φ(b) = b |