Ideas from 'How to Russell a Frege-Church' by David Kaplan [1975], by Theme Structure

[found in 'The Possible and the Actual' (ed/tr Loux,Michael J.) [Cornell 1979,0-8014-9178-9]].

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5. Theory of Logic / F. Referring in Logic / 2. Descriptions / c. Theory of definite descriptions
For Russell, expressions dependent on contingent circumstances must be eliminated
10. Modality / E. Possible worlds / 3. Transworld Objects / d. Haecceitism
'Haecceitism' is common thisness under dissimilarity, or distinct thisnesses under resemblance
'Haecceitism' says that sameness or difference of individuals is independent of appearances
If quantification into modal contexts is legitimate, that seems to imply some form of haecceitism