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In accordance with his belief that philosophical problems arise from misunderstandings of the logic of our language, Wittgenstein's philosophical investigations were always focused on the problems of logic of language. Indeed, it can be said that his investigations were logical investigations. But w...

In accordance with his belief that philosophical problems arise from misunderstandings of the logic of our language, Wittgenstein's philosophical investigations were always focused on the problems of logic of language. Indeed, it can be said that his investigations were logical investigations. But what was the logic as conceived by him? He regarded logic as grammar from the beginning, but between his two different philosophical periods, there were important changes in his conceptions of grammar. In his earlier period, he understood the logic of language as the truth-functional syntax realizable in an ideal notation, while in his later period he regarded logic as the rules of language-use in various language games. It was a change from viewing logic as an ideally strict and universal system in which every logical possibilities are determined to viewing logic as an open system of non-strict grammatical rules specific to each language game. This paper deals with the gists of his earlier and later views on logic and the reasons for the change of his views, including specifically the reasons for the change of his views concerning the autonomy and necessity of logic as grammar.

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