#7421 ⟨
a
,
b
,
c
|
ab
=1,
acba
=
bc
⟩
Up:
Monoid enumeration
Prev:
#7418
⟨
a
,
b
,
c
|
ab
=1,
acba
=
ac
⟩
Next:
#7423
⟨
a
,
b
,
c
|
ab
=1,
acba
=
cb
⟩
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
⋅
ba
=
a
and
a
⋅ 1 =
a
, however
ba
≠ 1
Not right cancellative, because right multiplication by
b
is not injective:
ba
⋅
b
=
b
and 1 ⋅
b
=
b
, however
ba
≠ 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 shortlex with
a
<
b
<
c
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
ab
⇒ 1
[1]
2.
bc
⇒
ac
[7]
3.
a
2
c
⇒
c
[6]
4.
cba
⇒
c
[5]
# abc:ab=1,acba=bc abc - - ab=1 bc=ac aac=c cba=c