#12319 ⟨
a
,
b
|
aaab
=
bb
,
bbaa
=
b
⟩
Up:
Monoid enumeration
Prev:
#12317
⟨
a
,
b
|
aaab
=
bb
,
babb
=
b
⟩
Next:
#12321
⟨
a
,
b
|
aaab
=
bb
,
bbab
=
b
⟩
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
b
is not injective:
b
⋅
b
5
=
b
and
b
⋅ 1 =
b
, however
b
5
≠ 1
Not right cancellative, because right multiplication by
b
is not injective:
b
5
⋅
b
=
b
and 1 ⋅
b
=
b
, however
b
5
≠ 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
) = 0; deg(
a
) = 1
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
b
6
⇒
b
[6]
2.
bab
⇒
b
4
[3]
3.
b
a
2
⇒
b
5
[7]
4.
a
3
b
⇒
b
2
[1]
# ab:aaab=bb,bbaa=b b/a - - bbbbbb=b bab=bbbb baa=bbbbb aaab=bb