#2878 ⟨
a
,
b
,
c
|
aab
=
a
,
bbc
=
a
⟩
Up:
Monoid enumeration
Prev:
#2876
⟨
a
,
b
,
c
|
aab
=
a
,
bac
=
c
⟩
Next:
#2879
⟨
a
,
b
,
c
|
aab
=
a
,
bbc
=
b
⟩
Contents
Properties
Rewriting system
Properties
Sum of relation sides is 8
Infinite non-cancellative non-commutative monoid
Element
a
has infinite order
Not left cancellative, because left multiplication by
a
is not injective:
a
⋅
ab
=
a
and
a
⋅ 1 =
a
, however
ab
≠ 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(
b
) = 0,
a
<
b
; deg(
c
) = 1
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
a
2
b
⇒
a
[1]
2.
ac
⇒
a
4
[4]
3.
abc
⇒
a
3
[3]
4.
b
2
c
⇒
a
[2]
# abc:aab=a,bbc=a ab/c - - aab=a ac=aaaa abc=aaa bbc=a