Philosophy Lexicon of Arguments

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Geach, Peter T.
 
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Content I 99
Content/Geach: if two sentences (sentence constructions) UVW and UXY as a whole have the same content, it does not mean that U in UVW and U in UXY has the same meaning!
E.g.
(5) All cats are mortal - is equivalent to the following two sentences:
(6) All cats are a subclass of mortals -
(7) All cats are the same class as some (subclasses of) mortals.
Each is as plausible as the other one, but they cannot both be correct, i.e. both are false.

Gea I
P.T. Geach
Logic Matters Oxford 1972


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Ed. Martin Schulz, access date 2017-05-01