According to Tarski to know the meaning of certain sentence, it means to understand in what condition the sentence is true. For instance, the sentence 'snow is white', to know the meaning of that sentence we have to understand what condition existed that supports that sentence is true. There is a formula concerning this discussion:
S is true if and if only P
S refers to the sentence, and P refers to the condition which supports the S. from the preceding example we can say that snow is white is true and if only snow is white.
In addition, the study of truth condition falls into two basic categories: the study of different types included in individual sentences: analytic and syntactic; and the study of different types of truth connections that hold between sentences; entailment and presupposition.
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