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“Turing attended Wittgenstein's lectures on the philosophy of mathematics in Cambridge in 1939 and disagreed strongly with a line of argument that Wittgenstein was pursuing which wanted to allow contradictions to exist in mathematical systems. Wittgenstein argues that he can see why people don't like contradictions outside of mathematics but cannot see what harm they do inside mathematics. Turing is exasperated and points out that such contradictions inside mathematics will lead to disasters outside mathematics: bridges will fall down. Only if there are no applications will the consequences of contradictions be innocuous. Turing eventually gave up attending these lectures. His despair is understandable. The inclusion of just one contradiction (like 0 = 1) in an axiomatic system allows any statement about the objects in the system to be proved true (and also proved false). When Bertrand Russel pointed this out in a lecture he was once challenged by a heckler demanding that he show how the questioner could be proved to be the Pope if 2 + 2 = 5. Russel replied immediately that 'if twice 2 is 5, then 4 is 5, subtract 3; then 1 = 2. But you and the Pope are 2; therefore you and the Pope are 1'! A contradictory statement is the ultimate Trojan horse.”
John D. Barrow“I want a permanent relationship, and I might feel inclined to reject anything which of its nature could not be permanent.”
Alan Turing“Ture stories can't be told forward, only backward. We invent them from the vantage point of an ever-changing present and tell ourselves how they unfolded.”
Siri Hustvedt, The Shaking Woman, or A History of My Nerves“Everyone know—or at least, was probably told as a child—that you can make a wish on a shooting star. Not everyone knows that the only way to be sure it will come ture is to speak it aloud before the star disappears, and this is a nearly imposssible fet to manage.”
Kate Milford, Greenglass House“We can only see a short distance ahead, but we can see plenty there that needs to be done.”
Alan Turing, Computing machinery and intelligence“The truest smiles are those which spread across our faces when no one's watching us.”
Minhal Mehdi