#20048 ⟨
a
,
b
|
aab
=
b
,
aaaa
=
aaa
⟩
Up:
Monoid enumeration
Prev:
#20047
⟨
a
,
b
|
aab
=
a
,
bbbb
=
bbb
⟩
Next:
#20051
⟨
a
,
b
|
aab
=
b
,
aaaa
=
abb
⟩
Contents
Properties
Rewriting system
Properties
Sum of relation sides is 11
Infinite non-cancellative non-commutative monoid
Element
b
has infinite order
Not left cancellative, because left multiplication by
a
is not injective:
a
⋅
a
3
=
a
3
and
a
⋅
a
2
=
a
3
, however
a
3
≠
a
2
Not right cancellative, because right multiplication by
b
is not injective:
a
⋅
b
=
b
and 1 ⋅
b
=
b
, 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 shortlex with
a
<
b
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
ab
⇒
b
[3]
2.
a
4
⇒
a
3
[2]
# ab:aab=b,aaaa=aaa ab - - ab=b aaaa=aaa