#3544 ⟨
a
,
b
,
c
|
ab
=
aa
,
bb
=
ac
⟩
Up:
Monoid enumeration
Prev:
#3543
⟨
a
,
b
,
c
|
ab
=
aa
,
ba
=
ac
⟩
Next:
#3545
⟨
a
,
b
,
c
|
ab
=
aa
,
bc
=
aa
⟩
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
2
and
a
⋅
a
=
a
2
, however
b
≠
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 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
⇒
a
2
[1]
2.
ac
⇒
b
2
[2]
# abc:ab=aa,bb=ac ab/c - - ab=aa ac=bb