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By the logical syntax of a language, we mean the formal theory of the linguistic forms of that language -- the systematic statement of the formal rules which govern it together with the development of the consequences which follow from these rules. A theory, a rule, a definition, or the like is to be called formal when no reference is made in it either to the meaning of the symbols or to the sense of the expressions , but simply and solely to the kinds and order of the symbols from which the expressions are constructed. (en) |