#4121 ⟨
a
,
b
|
aabababaa
=
ab
⟩
Up:
Monoid enumeration
Prev:
#4120
⟨
a
,
b
|
aabababaa
=
aa
⟩
Next:
#4122
⟨
a
,
b
|
aabababaa
=
bb
⟩
Contents
Properties
Rewriting system
Properties
Sum of relation sides is 11
Infinite non-cancellative non-commutative monoid
Element
a
has infinite order
Not left cancellative, because left multiplication by
a
is not injective:
a
⋅ (
ab
)
3
a
2
=
ab
and
a
⋅
b
=
ab
, however (
ab
)
3
a
2
≠
b
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
Auxiliary generators:
c
=
ab
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
c
3
a
2
⇒
c
[4]
2.
c
4
a
2
⇒
a
c
3
ac
[6]
3.
ab
⇒
c
[2]
4.
cb
⇒
a
c
3
ac
[5]
# ab:aabababaa=ab ac/b ab=c magic:0 acccaa=c ccccaa=acccac ab=c cb=acccac