Two Squares of Opposition: for Analytic and Synthetic Propositions

preprint2011arXivOpen access

Abstract

In the paper I prove that there are two squares of opposition. The unconventional one is built up for synthetic propositions. There a, i are contrary, a, o (resp. e, i) are contradictory, e, o are subcontrary, a, e (resp. i, o) are said to stand in the subalternation.

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