#7578 ⟨
a
,
b
,
c
|
ab
=1,
caac
=
bb
⟩
Up:
Monoid enumeration
Prev:
#7577
⟨
a
,
b
,
c
|
ab
=1,
caac
=
ba
⟩
Next:
#7579
⟨
a
,
b
,
c
|
ab
=1,
caac
=
bc
⟩
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
⋅ (
aca
)
2
=
a
and
a
⋅ 1 =
a
, however (
aca
)
2
≠ 1
Not right cancellative, because right multiplication by
ac
a
2
c
is not injective:
(
aca
)
2
⋅
ac
a
2
c
=
ac
a
2
c
and 1 ⋅
ac
a
2
c
=
ac
a
2
c
, however (
aca
)
2
≠ 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(
a
) = deg(
c
) = 0,
a
<
c
; deg(
b
) = 1
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
(
a
2
c
)
2
⇒ 1
[5]
2.
ca
(
ac
)
2
⇒
ac
a
2
c
2
[6]
3.
b
⇒
ac
a
2
c
[3]
# abc:ab=1,caac=bb ac/b - - aacaac=1 caacac=acaacc b=acaac