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Ludwig Josef Johann Wittgenstein (April 26, 1889 – April 29, 1951) was a philosopher of Austrian origin who worked primarily in the foundations of logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language.His influence has been wide-ranging, and he is regarded by some as the most important philosopher since Immanuel Kant. Before his death at the age of 62,[3] the only book-length work Wittgenstein had published was the Tractatus Logico-Philosophicus. Philosophical Investigations, which Wittgenstein worked on in his later years, was published shortly after he died. Both of these works have been regarded as highly prominent in analytic philosophy.