Vanquishing the XCB Question: The Methodological Discovery of the Last Shortest Single Axiom for the Equivalential Calculus

detail a question that, for a quarter of a century, remained open despite intense study by various researchers. Is the formula XC B = e(x e(e(e( ) e( )) z)) a single axiom for the classical equivalential calculus when the rules of inference consist..
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Robert E. Tax (1973). On the Intuitionistic Equivalential Calculus. Notre Dame Journal of Formal Logic 14 (4):448-456.

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