
theorem Th87:
  for x,y,z being set holds InnerVertices GFA2AdderStr(x,y,z) = {
  [<*x,y*>,xor2c]} \/ {GFA2AdderOutput(x,y,z)}
proof
  let x,y,z be set;
  GFA2AdderOutput(x,y,z) = GFA1AdderOutput(x,y,z);
  hence thesis by Th55;
end;
