A nonstandard proof for Szpilrajn's theorem
  Recall that Szpilrajn (1930) ([4], [5]) states that on a given set, any partial order can be extended to a total order on the same set. In this work we give, in the context of the IST theory ([2],[3],[6]), a more constructive proof for this theorem. In addition, we benefit of the tools used to give some other results. 
Abdelmadjid Boudaoud (LMPA)
math.LO