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Andrei Paskevich authored
the verification algorithm must always terminate and be reasonably performant in practice, but its worst-case complexity is unknown and probably exponential. What is quite easy when there is only one recursive definition, becomes difficult when there is a group of mutually recursive definitions. An educated discussion would be highly appreciated. BTW, I had to convert a couple of recursive "logic"s on integers into an abstract "logic" + axiom. Pretty much all of them supposed that the argument was non-negative, and thus were non-terminating!
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