
theorem Th27:
  for S1,S2 being unsplit gate`1=arity non empty ManySortedSign
  holds InnerVertices (S1+*S2) = (InnerVertices S1) \/ InnerVertices S2
proof
  let S1,S2 be unsplit gate`1=arity non empty ManySortedSign;
  S1 tolerates S2 by CIRCCOMB:47;
  hence thesis by CIRCCOMB:11;
end;
