Clearly this is just Scotus’ principle of contradictories, expressed in clause (iii), with clauses (i) and (ii) added by Ockham. The thrust of Ockham’s alteration is to recognize that there are more ways to account for change in truth value besides changes in what things there are; a change in time or a change of location can also explain it. But, if Ockham’s version is correct and Scotus’s is not, then Chatton’s plurality argument using his Principle will not go through: we don’t have to posit that \(n + 1\) things exist if \(n\) things will not explain the truth of some true proposition, since the truth may be adequately explained simply by the passage of time or the occurrence of change. It is absolutely clear that Ockham’s expansion of the principle of contradictories and Chatton’s ‘howsoever they are present according to arrangement and duration’ clause in version (2) of the Principle above play off each other, and in these formulas we see some of the intense mutual influence between Ockham and Chatton.