#5322 ⟨
a
,
b
|
abaabab
=
bbbb
⟩
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Monoid enumeration
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#5321
⟨
a
,
b
|
abaabab
=
bbba
⟩
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#5323
⟨
a
,
b
|
abaabba
=
aaaa
⟩
Contents
Properties
Rewriting system
Properties
Sum of relation sides is 11
Infinite non-cancellative non-commutative monoid
Element
a
has infinite order
Not right cancellative, because right multiplication by
b
is not injective:
(
aba
)
2
⋅
b
=
b
4
and
b
3
⋅
b
=
b
4
, however (
aba
)
2
≠
b
3
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.
(
aba
)
2
b
⇒
b
4
[1]
2.
ab
a
2
b
5
⇒
b
4
a
(
ab
)
2
[2]
# ab:abaabab=bbbb ba - - abaabab=bbbb abaabbbbb=bbbbaabab