File: andrews.in

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prover9-manual 0.0.200902a-2.1
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formulas(goals).

% Andrews challenge problem (stated positively)

(
   (
     (exists x all y (p(x) <-> p(y)))
     <->
     ((exists u q(u)) <-> (all v p(v)))
   )
   <->
   (
     (exists w all z (q(z) <-> q(w)))
     <->
     ((exists x1 p(x1)) <-> (all x2 q(x2)))
   )
).

end_of_list.