|Substitution, philosophy: here we are concerned with replacing verbal elements or logical symbols within expressions or logical formulas by other linguistic elements or logical symbols that are able to form a meaningful statement at the same syntactic position. If the truth value (true or false) of the statement is preserved, one speaks of the substitutability of a term by another term in a certain context. See also equality, insertion, meaning, identity, co-reference._____________Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.|
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Substitutability/substitution/QuineVsLeibniz: the strength of this requirement varies with the richness of the language -we need both single- and multi-digit predicates, truth functions (not, and, or, etc.), classes, classes of classes, descriptions, singular term - this language is then extensional: any two predicates that match extensionally (are true for the same object) are substitutable salva veritate - but that does not secure cognitive synonymy.
Substitutability/Quine: question salvo quo? Something is always changed.
Replace/substitution/Quine: if in a statement that has been substituted for "Fx" free variables other than "x" occurr, then they may not be such that fall under the scope of quantifiers that occur in the scheme in which the substitution was made._____________Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution.
Wort und Gegenstand Stuttgart 1980
Theorien und Dinge Frankfurt 1985
Grundzüge der Logik Frankfurt 1978
Mengenlehre und ihre Logik Wiesbaden 1967
Die Wurzeln der Referenz Frankfurt 1989
Unterwegs zur Wahrheit Paderborn 1995
From a logical point of view Cambridge, Mass. 1953
Bezeichnung und Referenz
Zur Philosophie der idealen Sprache, J. Sinnreich (Hg), München 1982
Philosophie der Logik Bamberg 2005
Ontologische Relativität Frankfurt 2003