theorem Th65:
  H is neg-inner-most implies (H is Sub_atomic or H is conjunctive
  or H is disjunctive or H is next or H is Until or H is Release)
proof
  assume
A1: H is neg-inner-most;
  per cases by MODELC_2:2;
  suppose
    H is atomic;
    hence thesis;
  end;
  suppose
A2: H is negative;
    set G = the_argument_of H;
A3: G is atomic by A1,A2;
    H = 'not' G by A2,MODELC_2:def 18;
    hence thesis by A3;
  end;
  suppose
    H is conjunctive or H is disjunctive or H is next or H is Until or
    H is Release;
    hence thesis;
  end;
end;
