reserve X for set;
reserve a,b,c,k,m,n for Nat;
reserve i,j for Integer;
reserve r,s for Real;
reserve p,p1,p2,p3 for Prime;
reserve z for Complex;

theorem
  for k being n_or_greater Nat holds k in GreaterOrEqualsNumbers(n)
  by EC_PF_2:def 1,Th56;
