#15703 ⟨
a
,
b
|
aab
=
ba
,
abbbb
=
a
⟩
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Monoid enumeration
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#15696
⟨
a
,
b
|
aab
=
ba
,
ababb
=
b
⟩
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#15706
⟨
a
,
b
|
aab
=
ba
,
baaaa
=
b
⟩
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
⋅
b
4
=
a
and
a
⋅ 1 =
a
, however
b
4
≠ 1
Not right cancellative, because right multiplication by
a
is not injective:
a
16
⋅
a
=
a
2
and
a
⋅
a
=
a
2
, however
a
16
≠
a
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:
Right-to-left recursive path with deg(
a
) = 0; deg(
b
) = 1
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
a
17
⇒
a
2
[3]
2.
ba
⇒
a
2
b
[1]
3.
a
b
4
⇒
a
[2]
# ab:aab=ba,abbbb=a reversed:a/b - - aaaaaaaaaaaaaaaaa=aa ba=aab abbbb=a