#1990 ⟨a, b | aaa=a, abba=a⟩

Properties

Sum of relation sides is 9
Infinite non-cancellative non-commutative monoid
Element aba has infinite order
Not left cancellative, because left multiplication by a is not injective:
- a ⋅ a² = a and a ⋅ 1 = a, however a² ≠ 1
Not right cancellative, because right multiplication by a is not injective:
- a² ⋅ a = a and 1 ⋅ a = a, however a² ≠ 1

Format:	Pretty Plain
Word:
	Enter a word above to compute its normal form. Tips: Lowercase letters stand for generators. Spaces are ignored. Numbers repeat the previous letter, e.g. `b90`.
Strategy:	Leftmost Rightmost
Result:	1 1

#	Rule	Proof
1.	a³ ⇒ a	[1]
2.	ab²a ⇒ a	[2]

# ab:aaa=a,abba=a ab - -
aaa=a
abba=a

The mapping is from the listed presentation's alphabet to the current rewriting system's alphabet.

5 total

Σ	#	Presentation	Mapping
11	12250	⟨a, b \| aaab=ab, abba=a⟩	φ(a) = a, φ(b) = b
11	18700	⟨a, b \| aaa=a, aaabba=a⟩	φ(a) = a, φ(b) = b
11	18710	⟨a, b \| aaa=a, aabbaa=a⟩	φ(a) = a, φ(b) = b
11	19254	⟨a, b \| aaa=a, aabba=aa⟩	φ(a) = a, φ(b) = b
11	19814	⟨a, b \| aaa=a, abba=aaa⟩	φ(a) = a, φ(b) = b