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Constrained Function Definitions

Restrict Arguments (needs set theory):

f: A0 x ... x An-1 -> B

f(x0, ..., xn-1) := T

New axiom:

forall x0, ..., xn-1:

<x0, ..., xn-1> in A =>

f(x0, ..., xn-1) = T.

If arguments violate condition, function result is undefined.