Lexicon of Arguments

 

II 64
Contingent/Necessary/Predicate/Cresswell: suppose predicate P is contingent and applies to the objects a1, a2...
N.B.: we can convert this contingent predicate into a necessary predicate:
Necessary/Predicate: Q: should necessarily apply to precisely those objects to which P applies contingently.
Solution: Q: "is a1 or a2 or is..."
Meaning: the meaning of these two predicates is of course not the same, but it would have to be, because they apply to the same set of things.
>Extensionality.
Could there be two such predicates? Some perception predicates seem to work like this.
E.g. Suppose the set of red and round things happened to be the same set - but the internal patterns (devices) in recognizing subjects are different.
>Perception, >Attribution, >Observation, >Observation language, >Observation sentence.