On naked singularities in the extreme double Reissner-Nordstr\"{o}m   solution
  We present a quite simple analytical study on the appearance or absence of naked singularities in binary systems. As an example we consider the double Reissner-Nordstr\"om solution and fix the conditions it should satisfy in order to avoid or develop singular surfaces off the axis. The proof shows that singular surfaces appear as a consequence of the presence of negative masses in the solution. 
I. Cabrera-Munguia, Alfredo Mac\'ias
gr-qc