The Absorption law reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Absorption law

In mathematics, the absorption law is an identity between two binary operations. It is valid and fundamental in Boolean algebra, and lattice theory.

For the binary operators ∧ and ∨, which are defined respectively as the logical AND and OR, the following applies:

a ∧ (a ∨ b) = a ∨ (a ∧ b) = a.

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