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Truth/truth theory/Wittgenstein: is not a concept. - Therefore, there is no truth theory.
Reason: to help you decide e.g. between physical theories, one needs a lot of empirical evidence. - In this truth is applied. - (So to distinguish between theories). - Then there can be no theory of truth.
Vorlesungen 1930-35 Frankfurt 1989
Das Blaue Buch - Eine Philosophische Betrachtung Frankfurt 1984
Tractatus Logico Philosophicus Frankfurt/M 1960