Wittgenstein’s first period, culminating in 1921’s Tractatus Logico-Philosophicus(which Pears had co-translated), drew heavily on Bertrand Russell’s work in philosophical logic and made a huge impact on the logical positivist movement of the time, which would later in turn influence computer science, artificial intelligence, and linguistics. The Tractatus makes an ambitious and ostensibly definitive attempt to chart out the relationship between language and the world.
Then he went away and did other things for ten years (like teaching school and beating up his students, for instance), and then he said no that was all wrong, and started over.
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Language did not have such a fixed, eternal relation to reality bound by logic.