
formulas(assumptions).

% The candidate below is a theorem of the equivalential calculus.
% We can show that it is not a single axiom, because e(x,x) does not
% follow.

% Mace4 should produce a counterexample immediately.

  -P(e(x,y)) | -P(x) | P(y) # label(Condensed_detachment).

  P(e(e(x,y),e(e(y,z),e(z,x)))) # label(candidate).

end_of_list.

formulas(goals).

  P(e(x,x)) # label(Reflexivity).

end_of_list.
