#4690 ⟨
a
,
b
|
aaab
=
b
,
baba
=
b
⟩
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Monoid enumeration
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#4688
⟨
a
,
b
|
aaab
=
b
,
baab
=
b
⟩
Next:
#4691
⟨
a
,
b
|
aaab
=
b
,
babb
=
a
⟩
Contents
Properties
Rewriting system
Properties
Sum of relation sides is 10
Infinite non-cancellative non-commutative monoid
Element
a
has infinite order
Not left cancellative, because left multiplication by
b
is not injective:
b
⋅
a
=
b
2
and
b
⋅
b
=
b
2
, however
a
≠
b
Not right cancellative, because right multiplication by
b
is not injective:
b
3
⋅
b
=
b
and 1 ⋅
b
=
b
, however
b
3
≠ 1
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.
ba
⇒
b
2
[7]
2.
b
4
⇒
b
[6]
3.
a
3
b
⇒
b
[1]
# ab:aaab=b,baba=b ba - - ba=bb bbbb=b aaab=b