public void changedCell(DF_LatticeCell cell){
  Iterator<DF_Equation> e=cell.getUses();
  while (e.hasNext()) {
    newEquations.add(e.next());
  }
}

public void changedCell ( DF_LatticeCell cell ) { Iterator < DF_Equation > e = cell . getUses ( ) ; while ( e . hasNext ( ) ) { newEquations . add ( e . next ( ) ) ; } }
call this method when the contents of a lattice cell changes . this routine adds all equations using this cell to the set of new equations .
