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Jaarboek Thomas Instituut 1997 - Thomas Instituut te Utrecht

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ARE GOD AND HUMAN CREATURES FREE? 121<br />

page 38 is qui<strong>te</strong> different from the meaning of M on page 257.9<br />

4.5.1 Particularly in section 7.1 there is a wealth of points<br />

to be commen<strong>te</strong>d on and it is not an easy affair to sort out all the<br />

different strands. The first objection (260-263) revolves around the<br />

semantics and ontology of possible worlds. Now every type of a<br />

metaphysical theory can be rephrased and extrapola<strong>te</strong>d into the modal<br />

logic and semantics of possible worlds, but whether the ontology of a<br />

specific thinker is an ontology of possible worlds is qui<strong>te</strong> a different<br />

issue. The ontology of the young John Duns af<strong>te</strong>r 1297 is apt to be<br />

elabora<strong>te</strong>d into an actualist semantics and ontology of possible worlds,<br />

but Duns Scotus does not dispose of such an ontology as, to my<br />

knowledge, no medieval thinker does."<br />

4.5.2 The first instance of a primitive possible worlds<br />

ontology I am acquain<strong>te</strong>d with is the scientia media ontology of<br />

Molina in the seventies of the six<strong>te</strong>enth century. Although there is a<br />

historical connection between Leibniz and the Scotism of the<br />

seven<strong>te</strong>enth century, Duns' and Leibniz' ontologies are markedly<br />

different. Therefore arguments against modern semantics of possible<br />

worlds are not in order concerning Duns Scotus' view, because there<br />

is no possible worlds ontology in Duns. "Scotus coined the expression<br />

possibile logicum, for which non-contradiction is the only cri<strong>te</strong>rion"<br />

(260). This is possibly true, but according to Duns genuine possibility<br />

in our factual world is not what is logically possible in that specific<br />

sense, because this genuine possibility consists in being compatible<br />

M = possibility operator (usually two-sided possibility).<br />

9 Possible (M) =df true in at least one possible world.<br />

10 See for Duns' theory of contingency A. Vos, Kennis en<br />

noodzakelijkheid (KN), Kampen 1981, 81-87 and 269-275. Compare KN 82:<br />

"De clou van Duns Scotus' argument in dezen is in <strong>te</strong>rmen van onze<br />

metafysica van mogelijke werelden gemakkelijk <strong>te</strong> herformuleren" and KN<br />

271-273: no metaphysics of possible worlds and no purely ontological<br />

treatment of divine knowledge with KN 270, thesis (89): If a sta<strong>te</strong> of affairs S<br />

is contingent, then S is factual as a partial formalization of Duns' concept of<br />

synchronic contingency. My own concept of radical contingency is in fact<br />

rather different in several respects, but still deducible from Duns' view - see<br />

KN 241-244 and 282 f.f.

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