Cataldo, Peter J.  "Whitehead and Aristotle on Propositions."  Process Studies 12, no. 1 (Spring 1982): 15-22.

Abstract

This article is a general comparative study of the central differences among Whitehead's and Aristotle's theories about propositions.  It is shown that Aristotle identifies propositions as such with their judgments and linguistic expressions.  An exposition of the main elements of Whitehead's theory is given in order to show that Whitehead divorces the nature of a proposition from its corresponding judgment and linguistic expressions.  This difference from Aristotle's theory means that Whitehead avoids the logical problem of 'negative facts'.  [Abstract from The Philosopher's Index]