reserve S for non empty non void ManySortedSign,
  A for MSAlgebra over S;

theorem Th12:
  for S being non empty non void ManySortedSign, s1,s2 being
  SortSymbol of S for A being MSAlgebra over S, f being Function st f
  is_e.translation_of A,s1,s2 holds [s1,s2] in TranslationRel S
by Def3;
