William of Sherwood, Singular Propositions and the Hexagon of Opposition
نویسنده
چکیده
In Aristotelian logic, the predominant view has always been that there are only two kinds of quantities: universal and particular. For this reason, philosophers have struggled with singular propositions (e.g., “Socrates is running”). One modern approach to this problem, as first proposed in 1955 by Tadeusz Czeżowski, is to extend the traditional Square of Opposition to a Hexagon of Opposition. We note that the medieval author William of Sherwood developed a similar theory of singular propositions, much earlier than Czeżowski, and that it is not impossible that the Hexagon itself could have been present in Sherwood’s writings.
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