Philosophy Lexicon of Arguments

Author Item Excerpt Meta data

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I 53
Two-Classes-Theory/GeachVs: is even worse than the Two-Names-Theory: the assumption that the general term "philosopher" denotes the "class of philosophers". - Socrates would then only be a part of the class. Vs: the element-relation is quite different from the subclass-relation: E.g. a parliamentary committee is not a member of Parliament. - But: "Is a philosopher" means exactly the same in both applications. - copula: fallacy of separation: as if there were two varieties of "is": one for "is a philosopher" and one for "is an element of the class of philosophers" - Geach: equivalent sentences must not be divided into equivalent partial sentences. - "Every logician" is not equivalent to "class of logicians".

Gea I
P.T. Geach
Logic Matters Oxford 1972

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Ed. Martin Schulz, access date 2017-05-29