|Geach, Peter T.
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|Sets||I 215 ~
Classes/Geach: must not be treated as objects (> paradoxes) - Solution:
I 215 ~
Relation/Geach: instead of a class: solution to problems - a class may be no object (> paradoxes) Relation: E.g. diameter/Plate: - E.g. father-son-grandson: same relation, but no common subject.
"is a..."/Geach: no logical relation between an x and an object (class) called "man".
Classes/Geach: can be viewed as an object only when we say, "the class of A’s may be the same as the class of the B’s, although something is an A, without being a B".
Logic Matters Oxford 1972