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...Lambda calculus for engineers pieter h hartel and willem g vree faculty of electrical engineering mathematics computer science university twente e mail address utwente nl technology policy management technical delft w tudelft abstract inpurefunctionalprogrammingitisawkwardtouseastatefulsub computation in a predominantly stateless the problem is that state sub has to be passed around using ugly plumbing classical examples are providing supply fresh names random numbers we propose use deterministic inductive denitions rather than recursion equations as basic paradigm show how this makes it easier add introduction variable convention states if m mn occur certain mathematical context denition proof then these terms all bound variables chosen dierent from free one such dening equation substitution abstraction y toadhere may necessary rename which turn requires example below z name appears only here x authors like other concerned with seem ingly trivial issue freshness over past years number...