8. Undecidability
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1:16:37
9. Reducibility
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1:21:41
10. Computation History Method
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5:27
A Sad Moment in American History
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1:02:34
MIT Godel Escher Bach Lecture 1
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1:14:49
6. TM Variants, Church-Turing Thesis
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1:17:32
11. Recursion Theorem and Logic
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14:15
Undecidability Tangent (History of Undecidability Part 1) - Computerphile
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34:00