Wittgenstein (1889–1951)
Ludwig Josef Johann Wittgenstein was an Austrian philosopher who contributed several ground-breaking works to contemporary philosophy, primarily on the foundations of logic, the philosophy of mathematics, the philosophy of language, and the philosophy of mind. He is widely regarded as one of the most influential philosophers of the 20th century.
From Wikipedia
See also:
Internet Encyclopaedia of Philosophy
Stanford Encyclopaedia of Philosophy
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