, Volume 42, Issue 2, pp 391-407
Date: 21 Apr 2012

The Syllogistic with Unity

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Abstract

We extend the language of the classical syllogisms with the sentence-forms “At most 1 p is a q” and “More than 1 p is a q”. We show that the resulting logic does not admit a finite set of syllogism-like rules whose associated derivation relation is sound and complete, even when reductio ad absurdum is allowed.