Computer Science – Logic in Computer Science
Scientific paper
2002-11-13
Computer Science
Logic in Computer Science
6 pages, no figures
Scientific paper
It has long been an open question whether the formula XCB = EpEEEpqErqr is,
with the rules of substitution and detachment, a single axiom for the classical
equivalential calculus. This paper answers that question affirmatively, thus
completing a search for all such eleven-symbol single axioms that began seventy
years ago.
Fitelson Branden
Ulrich Dolph
Wos Larry
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