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5. Theory of Logic / I. Semantics of Logic / 6. Intensionalism

[semantic system built on reference to properties]

4 ideas
Frege is intensionalist about reference, as it is determined by sense; identity of objects comes first [Frege, by Jacquette]
Frege moved from extensional to intensional semantics when he added the idea of 'sense' [Frege, by Sawyer]
Intension is not meaning, as 'cube' and 'square-faced polyhedron' are intensionally the same [Putnam]
Intensionalists say meaning is determined by the possession of properties [Jacquette]