theorem Th7: ([<*> LTLB_WFF,<*A*>])^ = TVERUM '&&' 'not' A
  proof
    nega <*A*> = <*'not' A*> & [<*> l,<*A*>]`1 = <*> l
    by LTLAXIO2:14;
    hence thesis by LTLAXIO2:10, LTLAXIO2:11;
  end;
