#4893 ⟨
a
,
b
|
aaaaaaa
=
abab
⟩
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Monoid enumeration
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#4892
⟨
a
,
b
|
aaaaaaa
=
aabb
⟩
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#4894
⟨
a
,
b
|
aaaaaaa
=
abba
⟩
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
a
is not injective:
a
⋅
a
6
= (
ab
)
2
and
a
⋅
bab
= (
ab
)
2
, however
a
6
≠
bab
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(
a
) = 0; deg(
b
) = 1
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
a
8
b
⇒
ab
a
7
[2]
2.
(
ab
)
2
⇒
a
7
[1]
# ab:aaaaaaa=abab a/b - - aaaaaaaab=abaaaaaaa abab=aaaaaaa