#2603 ⟨
a
,
b
|
ababba
=
abaa
⟩
Up:
Monoids with two generators and one relation
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#2602
⟨
a
,
b
|
ababba
=
aabb
⟩
Next:
#2604
⟨
a
,
b
|
ababba
=
abab
⟩
Quick links
Properties
Rewriting system
Properties
Presentation has sum-of-sides 10
Infinite non-cancellative non-commutative monoid
Not left cancellative, because left multiplication by
a
is not injective:
a
⋅
ba
b
2
a
=
ab
a
2
and
a
⋅
b
a
2
=
ab
a
2
, however
ba
b
2
a
≠
b
a
2
Not right cancellative, because right multiplication by
a
is not injective:
aba
b
2
⋅
a
=
ab
a
2
and
aba
⋅
a
=
ab
a
2
, however
aba
b
2
≠
aba
Enveloping group is isomorphic to ℤ
2
∗ ℤ
Rewriting system
Format:
Pretty
Plain
Word to reduce:
Tips:
Lowercase letters stand for generators.
Spaces are ignored.
Numbers repeat the previous letter, e.g.
b90
.
Reduction strategy:
Leftmost
Rightmost
Path to normal form:
1
1
Reduction order:
Left-to-right shortlex with
a
<
b
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
aba
b
2
a
⇒
ab
a
2
[1]
# ab:ababba=abaa ab ababba=abaa