#7841 ⟨
a
,
b
,
c
|
ab
=1,
cac
=
bcb
⟩
Up:
Monoid enumeration
Prev:
#7839
⟨
a
,
b
,
c
|
ab
=1,
cac
=
bbc
⟩
Next:
#7842
⟨
a
,
b
,
c
|
ab
=1,
cac
=
bcc
⟩
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:
Right-to-left 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.
ab
⇒ 1
[1]
2.
cac
⇒
bcb
[2]
3.
c
2
b
⇒
bcbac
[3]
# abc:ab=1,cac=bcb reversed:ab/c - - ab=1 cac=bcb ccb=bcbac