#5371 ⟨
a
,
b
,
c
|
ab
=
a
,
bbcb
=
a
⟩
Up:
Monoid enumeration
Prev:
#5370
⟨
a
,
b
,
c
|
ab
=
a
,
bbca
=
c
⟩
Next:
#5372
⟨
a
,
b
,
c
|
ab
=
a
,
bbcb
=
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
⋅
b
=
a
and
a
⋅ 1 =
a
, however
b
≠ 1
Not right cancellative, because right multiplication by
a
is not injective:
b
2
c
⋅
a
=
a
2
and
a
⋅
a
=
a
2
, however
b
2
c
≠
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:
Left-to-right shortlex with
a
<
b
<
c
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
ab
⇒
a
[1]
2.
aca
⇒
a
3
[5]
3.
acb
⇒
a
2
[3]
4.
b
2
ca
⇒
a
2
[4]
5.
b
2
cb
⇒
a
[2]
# abc:ab=a,bbcb=a abc - - ab=a aca=aaa acb=aa bbca=aa bbcb=a