z3 - How to simplify the result of (eval (f x y))? -


how can simplify boolean expression obtained result of evaluating uninterpreted function? instance, in example: http://rise4fun.com/z3/g8sl, 

(eval (f x y))

yields (not (and (not x) (not y)))

i want instead expression (or x y). 

(simplify (eval (f x y))

gives error.

this not supported in smt-lib 2.0 front-end. should consider 1 programmatic front-ends z3. example, here how using z3 python front-end (also available here):

b = boolsort() f = function('f', b, b, b) x, y = bools('x y') b1, b2 = bools('b1 b2')  s = solver() s.add(forall([b1, b2], implies(or(b1, b2), f(b1, b2)))) s.add(exists([b1, b2], not(f(b1, b2))))  print(s.check()) m = s.model() print(m.evaluate(f(x, y))) print(simplify(m.evaluate(f(x, y)), elim_and=true))

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