Philosophy Lexicon of Arguments

Logic: logic is the doctrine of the admissibility or inadmissibility of relations between statements and thus the validity of the compositions of these statements. In particular, the question is whether conclusions can be obtained from certain presuppositions such as premises or antecedents. Logical formulas are not interpreted at first. Only the interpretation, i. e. the insertion of values, e.g. objects instead of the free variables, makes the question of their truth meaningful.
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I 108
logical procedure / Geach: not linguistically, but a function defined by inserting: "P is used for Q in E", so as to obtain E " - it means that there is an expression E"", that is the value of P for the argument E and E " is the value of Q for E"" as an argument. - ((s) otherwise only mutual references: Q, namely Peter - Peter, namely Q. (> identity)).

Gea I
P.T. Geach
Logic Matters Oxford 1972

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Ed. Martin Schulz, access date 2017-05-28