#6824 ⟨a, b | aab=b, bbb=aaa⟩
Contents
- Properties
- Commutative structure
- Finite structure
- Staircase diagram
- Cayley table
- Right Cayley graph
- Rewriting system
- Same cardinality
- Isomorphic instances
- Sum of relation sides is 10
- Finite commutative monoid with 9 elements
- Not cancellative, because multiplication by b is not injective:
-
b ⋅ a2 = b and b ⋅ 1 = b, however a2 ≠ 1
- Gröbner basis: ⟨a, b | a2b=b, b3=a3, a5=a3⟩
- Cancellative quotient is isomorphic to ℤ6
- Enveloping group is isomorphic to ℤ6
- Group of units is isomorphic to ℤ1
- 2 Archimedian components:
An idempotent element x satisfies x2 = x.
The index and period of x is the least m (index) and n (period) such that x(m+n) = xm.
- 1 non-trivial idempotent:
- Order of generators:
- a: index 3, period 2
- b: index 1, period 6
- Histogram:
| index 1, period 1 | 1 element | b3a |
| index 1, period 2 | 1 element | b3 |
| index 1, period 3 | 2 elements | ba, b2 |
| index 1, period 6 | 2 elements | b, b2a |
| index 2, period 1 | 1 element | a2 |
| index 3, period 2 | 1 element | a |
Idempotents are shown in bold.
|
1 | a | b | a2 | ba | b2 | b2a | b3 | b3a |
| 1 | 1 | a | b | a2 | ba | b2 | b2a | b3 | b3a |
| a | a | a2 | ba | b3 | b | b2a | b2 | b3a | b3 |
| b | b | ba | b2 | b | b2a | b3 | b3a | ba | b |
| a2 | a2 | b3 | b | b3a | ba | b2 | b2a | b3 | b3a |
| ba | ba | b | b2a | ba | b2 | b3a | b3 | b | ba |
| b2 | b2 | b2a | b3 | b2 | b3a | ba | b | b2a | b2 |
| b2a | b2a | b2 | b3a | b2a | b3 | b | ba | b2 | b2a |
| b3 | b3 | b3a | ba | b3 | b | b2a | b2 | b3a | b3 |
| b3a | b3a | b3 | b | b3a | ba | b2 | b2a | b3 | b3a |
Idempotents are shown in bold.
- Reduction order:
- Left-to-right shortlex with b < a
- Certificate: derivations of all rewriting rules from the defining relations.
# ab:aab=b,bbb=aaa ba - -
ab=ba
baa=b
aaa=bbb
bbbb=ba
26 unique, 937 total
| Σ | # | Presentation | Properties | Description | φ |
| 7 | 118 | ⟨a, b | aaa=b, bbb=1⟩ | Grp Com 9 | ℤ9 | 562 |
| 8 | 568 | ⟨a, b | aaa=a, abb=b⟩ | Noc 9 | | 5 |
| 8 | 571 | ⟨a, b | aaa=a, bbb=a⟩ | Noc Com 9 | ℕ(9 = 3) | 48 |
| 8 | 581 | ⟨a, b | aaa=b, bbb=a⟩ | Noc Com 9 | ℕ(9 = 1) | 62 |
| 8 | 601 | ⟨a, b | aba=b, bab=a⟩ | Noc 9 | | 3 |
| 9 | 1584 | ⟨a, b | aaa=aa, bbb=a⟩ | Noc Com 9 | ℕ(9 = 6) | 16 |
| 9 | 1595 | ⟨a, b | aaa=ab, bab=b⟩ | Noc 9 | | 9 |
| 9 | 1598 | ⟨a, b | aaa=ab, bbb=a⟩ | Noc Com 9 | ℕ(9 = 4) | 40 |
| 9 | 1608 | ⟨a, b | aaa=bb, bbb=a⟩ | Noc Com 9 | ℕ(9 = 2) | 70 |
| 9 | 1991 | ⟨a, b | aaa=a, abba=b⟩ | Noc 9 | | 3 |
| 9 | 2064 | ⟨a, b | aab=b, abba=a⟩ | Noc 9 | | 38 |
| 9 | 2255 | ⟨a, b | ab=aa, bba=bb⟩ | Noc 9 | | |
| 10 | 4125 | ⟨a, b | aab=aaa, baa=b⟩ | Noc 9 | | 2 |
| 10 | 4130 | ⟨a, b | aab=aaa, bbb=a⟩ | Noc Com 9 | ℕ(9 = 7) | 1 |
| 10 | 4156 | ⟨a, b | abb=aaa, bbb=a⟩ | Noc Com 9 | ℕ(9 = 5) | 12 |
| 10 | 5035 | ⟨a, b | aaa=aa, abbb=b⟩ | Noc 9 | | 3 |
| 10 | 5079 | ⟨a, b | aaa=bb, aaba=b⟩ | Noc Com 9 | | 8 |
| 10 | 5124 | ⟨a, b | aab=aa, bbbb=a⟩ | Noc Com 9 | ℕ(9 = 8) | 5 |
| 10 | 5339 | ⟨a, b | aaa=bb, aab=ab⟩ | Noc 9 | | 1 |
| 10 | 7139 | ⟨a, b | bb=aa, aaaa=ab⟩ | Noc 9 | | 3 |
| 10 | 9327 | ⟨a, b | ab=a, baaa=bbb⟩ | Noc 9 | | 3 |
| 10 | 9359 | ⟨a, b | ab=a, bbaa=bbb⟩ | Noc 9 | | 2 |
| 11 | 19506 | ⟨a, b | aab=b, aaaaa=ba⟩ | Noc 9 | | |
| 11 | 19507 | ⟨a, b | aab=b, aaaaa=bb⟩ | Noc Com 9 | | |
| 11 | 20723 | ⟨a, b | ab=aa, aaaaa=bb⟩ | Noc 9 | | 15 |
| 11 | 25656 | ⟨a, b | ab=a, bbbbb=baa⟩ | Noc 9 | | |
The mapping is from the listed presentation's alphabet to the current rewriting system's alphabet.
5 total
| Σ | # | Presentation | Mapping |
| 10 | 6840 | ⟨a, b | aba=b, bbb=aaa⟩ | φ(a) = a, φ(b) = b |
| 11 | 20136 | ⟨a, b | aab=b, babb=aaa⟩ | φ(a) = a, φ(b) = ba |
| 11 | 20152 | ⟨a, b | aab=b, bbab=aaa⟩ | φ(a) = a, φ(b) = ba |
| 11 | 20292 | ⟨a, b | aba=b, abbb=aaa⟩ | φ(a) = a, φ(b) = ba |
| 11 | 20306 | ⟨a, b | aba=b, babb=aaa⟩ | φ(a) = a, φ(b) = ba |