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>McCarthy not understanding it is surprising.

I think he is commenting on the subtleties of it.

I think many reading here will say they understand it or have studied it in a course but I am not so sure everyone gets the subtle points. Myself I have always puzzled over the difference between what programmers call LC and what seems to be discussed by Church.

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I understand that Turing and Church came up with different approaches to describing the fundamentals of computing. You can see there is a relationship between LC and LISP. My question is how did we get to the von Neumann architecture and CPU instruction sets from either Church or Turing's work ?

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