#4981 ⟨
a
,
b
,
c
|
ab
=
a
,
ccccb
=1⟩
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Monoid enumeration
Prev:
#4978
⟨
a
,
b
,
c
|
ab
=
a
,
cccbb
=1⟩
Next:
#4982
⟨
a
,
b
,
c
|
ab
=
a
,
ccccc
=1⟩
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
and
a
⋅ 1 =
a
, however
b
≠ 1
Not right cancellative, because right multiplication by
c
3
b
is not injective:
c
3
bc
⋅
c
3
b
=
c
3
b
and 1 ⋅
c
3
b
=
c
3
b
, however
c
3
bc
≠ 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
<
c
Certificate
: derivations of all rewriting rules from the defining relations.
#
Rule
Proof
1.
ab
⇒
a
[1]
2.
c
4
b
⇒ 1
[2]
# abc:ab=a,ccccb=1 abc - - ab=a ccccb=1