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Oct 24, 2017 at 12:28 comment added Noah Schweber Something like this exists in the form of Girard's proof nets, or in Hughes' combinatorial proofs. I think an important problem with applying these ideas to this question, though, is determining what "a single step" should mean. There are long arguments which seem "content-free" to me, in the sense of not adding to the essential number of steps in some sense.
Oct 24, 2017 at 12:16 history answered Sylvain JULIEN CC BY-SA 3.0