#16494 ⟨
a
,
b
|
aab
=
aa
,
bab
=
aaa
⟩
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Monoid enumeration
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#16491
⟨
a
,
b
|
aab
=
aa
,
abb
=
aaa
⟩
Next:
#16497
⟨
a
,
b
|
aab
=
aa
,
bbb
=
aaa
⟩
Contents
Properties
Rewriting system
Properties
Sum of relation sides is 11
Infinite non-cancellative non-commutative monoid
Element
b
has infinite order
Not left cancellative, because left multiplication by
a
is not injective:
a
⋅
ab
=
a
2
and
a
⋅
a
=
a
2
, however
ab
≠
a
Not right cancellative, because right multiplication by
a
is not injective:
b
a
2
⋅
a
=
a
3
and
a
2
⋅
a
=
a
3
, however
b
a
2
≠
a
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 shortlex with
a
<
b
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
a
2
b
⇒
a
2
[1]
2.
bab
⇒
a
3
[2]
3.
b
a
3
⇒
a
3
[5]
4.
a
5
⇒
a
3
[3]
# ab:aab=aa,bab=aaa ab - - aab=aa bab=aaa baaa=aaa aaaaa=aaa