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Philosopher. Born Ludwig Josef Johann Wittgenstein in Neuwaldeggerstrasse, Neuwaldegg, Vienna, into a very wealthy Jewish international family, but brought up a Catholic. Initially he studied mechanical engineering and mathematics, then moved to Cambridge to study under Bertrand Russell. 'Tractatus Logico-Philosophicus', was his only philosophy book to be published in his lifetime, and was claimed to solve all the major problems of philosophy. Died at 76 Storeys Way, Cambridge.