#5139 ⟨
a
,
b
,
c
|
aa
=
a
,
bacb
=
a
⟩
Up:
Monoid enumeration
Prev:
#5138
⟨
a
,
b
,
c
|
aa
=
a
,
babc
=
c
⟩
Next:
#5140
⟨
a
,
b
,
c
|
aa
=
a
,
bacb
=
b
⟩
Contents
Properties
Rewriting system
Properties
Sum of relation sides is 8
Infinite non-cancellative non-commutative monoid
Element
ab
has infinite order
Not left cancellative, because left multiplication by
a
is not injective:
a
⋅
a
=
a
and
a
⋅ 1 =
a
, however
a
≠ 1
Not right cancellative, because right multiplication by
a
is not injective:
a
⋅
a
=
a
and 1 ⋅
a
=
a
, however
a
≠ 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 recursive path with deg(
a
) = deg(
c
) = 0,
a
<
c
; deg(
b
) = 1
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
a
2
⇒
a
[1]
2.
abaca
⇒
baca
[4]
3.
acb
⇒
baca
[3]
4.
b
2
aca
⇒
a
[5]
# abc:aa=a,bacb=a ac/b - - aa=a abaca=baca acb=baca bbaca=a