#443 ⟨
a
,
b
|
aabaab
=
aa
⟩
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Monoid enumeration
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#442
⟨
a
,
b
|
aaabbb
=
ba
⟩
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#444
⟨
a
,
b
|
aabaab
=
ab
⟩
Contents
Properties
Rewriting system
Properties
Sum of relation sides is 8
Infinite non-cancellative non-commutative monoid
Element
a
has infinite order
Not left cancellative, because left multiplication by
a
is not injective:
a
⋅
ab
a
2
b
=
a
2
and
a
⋅
a
=
a
2
, however
ab
a
2
b
≠
a
Rewriting system
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
Reduction order:
Left-to-right shortlex with
b
<
a
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
a
4
b
⇒
a
2
b
a
2
[2]
2.
(
a
2
b
)
2
⇒
a
2
[1]
# ab:aabaab=aa ba - - aaaab=aabaa aabaab=aa