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|Set Theory||I 165
Nouns/Prior: no names, no class name - Epsilon/Principia Mathematica/Russell: "x ε a": Translation: "A is an element of the class of humans" seems to be a relation between a concrete and an abstract object - Vs: better "x is a": "Russell is a man" - Prior: "is a" is no real verb that makes a sentence of a name, rather a sentence of name and noun - "ε" is not a real predicate.
Objects of thought Oxford 1971
Arthur N. Prior
Papers on Time and Tense 2nd Edition Oxford 2003