#5657 ⟨
a
,
b
,
c
|
aa
=
a
,
bcb
=
ac
⟩
Up:
Monoid enumeration
Prev:
#5656
⟨
a
,
b
,
c
|
aa
=
a
,
bcb
=
ab
⟩
Next:
#5658
⟨
a
,
b
,
c
|
aa
=
a
,
bcb
=
bb
⟩
Contents
Properties
Rewriting system
Properties
Sum of relation sides is 8
Infinite non-cancellative non-commutative monoid
Element
ba
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(
b
) = deg(
a
) = 0,
b
<
a
; deg(
c
) = 1
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
a
2
⇒
a
[1]
2.
ac
⇒
bcb
[2]
3.
abcb
⇒
bcb
[3]
# abc:aa=a,bcb=ac ba/c - - aa=a ac=bcb abcb=bcb