#13230 ⟨
a
,
b
|
baa
=
aab
,
bbb
=
ab
⟩
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Monoid enumeration
Prev:
#13229
⟨
a
,
b
|
baa
=
aab
,
bbb
=
aa
⟩
Next:
#13231
⟨
a
,
b
|
baa
=
aab
,
bbb
=
bb
⟩
Contents
Properties
Rewriting system
Properties
Sum of relation sides is 11
Infinite non-cancellative non-commutative monoid
Element
a
has infinite order
Not left cancellative, because left multiplication by
b
is not injective:
b
⋅
a
2
=
b
5
and
b
⋅
b
4
=
b
5
, however
a
2
≠
b
4
Not right cancellative, because right multiplication by
b
is not injective:
a
⋅
b
=
b
3
and
b
2
⋅
b
=
b
3
, however
a
≠
b
2
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 recursive path with deg(
b
) = 0; deg(
a
) = 1
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
ab
⇒
b
3
[2]
2.
b
a
2
⇒
b
5
[3]
# ab:baa=aab,bbb=ab b/a - - ab=bbb baa=bbbbb