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The conjecture that the equations for a Robbins algebra, commutativity, associativity, and the Robbins axiom
where denotes NOT and denotes OR, imply those for a Boolean algebra. The conjecture was finally proven using a computer (McCune 1997).
Kolata, G. "Computer Math Proof Shows Reasoning Power." New York Times, Dec. 10, 1996.
McCune, W. "Solution of the Robbins Problem." J. Automat. Reason. 19, 263-276, 1997.
McCune, W. "Robbins Algebras Are Boolean." http://www.cs.unm.edu/~mccune/papers/robbins/.
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