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...Cheat sheet calculus bnfgrammar parenthesis application is left associative t x variable tt abstraction right y and well known terms i s z xz yz k free variables vs bound dened outside a term intern to the name essential cannot be modied not important can fv inductive denition of n substitution by replacing all occurrences within if on conversion or equivalence renaming dening occurrence its depending e g but reduction applied anywhere in...