It is clearly explained: *What it is for a statement to be necessarily true, *Why necessity, possibility, existence, and non-existence are properties of propositions (truths and falsehoods), not of objects or states of affairs, *What conditions a class of expressions must meet if the expressions belonging to it jointly constitute a single language, *The significance for meta-linguistic research of the concepts of systematicity and productivity, as Chomsky defines these terms, and the relevance of these concepts to researches into the nature of necessity, *Why Quine's attempt to prove the non-existence of analytic truth is not only false but self-defeating, and, finally, *Why empirical science relies on truths of purely conceptual, non-observational kind to organize the data at its disposal.
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