Is absorption an axiom for a boolean algebra?

[Bipolarity]

According to wikipedia, absorption is an axiom for a boolean algebra. This seems incorrect to me, since I believe absorption can be proved from the other axioms (distributivity, associativity, commutativity, complement, identity).

Thoughts?

$AB' + A = AB' + A*1 = A(B'+1) = A(1) = A$

BiP

 

[mfb]

It is not needed as axiom: Axiomatization of Boolean algebras#Axiomatics
It is in the "proven" box, not in the axiom box.

 

[Bipolarity]

I don't see what you see. Where is this axiom/proven box?

BiP

 

[mfb]

To the right, with the titles "Huntington 1904 Boolean algebra axioms" and "Proven properties".