Commutative implies flexible: Difference between revisions

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(Created page with '{{magma property implication| stronger = commutative magma| weaker = flexible magma}} ==Statement== Suppose <math>(S,*)</math> is a commutative magma, i.e, we have: <math>…')
 
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<math>x * (y * x) = (x * y) * x \ \forall \ x,y \in S</math>
<math>x * (y * x) = (x * y) * x \ \forall \ x,y \in S</math>


This also shows that a commutative [[non-associative ring]] must be a [[fact about::flexible ring]].
==Proof==
==Proof==



Latest revision as of 21:53, 3 March 2010

This article gives the statement and possibly, proof, of an implication relation between two magma properties. That is, it states that every magma satisfying the first magma property (i.e., commutative magma) must also satisfy the second magma property (i.e., flexible magma)
View all magma property implications | View all magma property non-implications
Get more facts about commutative magma|Get more facts about flexible magma

Statement

Suppose (S,*) is a commutative magma, i.e, we have:

a*b=b*aa,bS

Then, (S,*) is also a flexible magma, i.e., we have:

x*(y*x)=(x*y)*xx,yS

This also shows that a commutative non-associative ring must be a Flexible ring (?).

Proof

Given: A magma (S,*) where a*b=b*a for all a,bS.

To prove: x*(y*x)=(x*y)*x for all x,yS.

Proof:

By commutativity between x and y, we have:

x*(y*x)=x*(x*y)()

Further, by commutativity of x and x*y, we have:

x*(x*y)=(X*y)*x()

Combining () and (), we obtain what we need to prove.