reserve X for set;
reserve k,m,n for Nat;
reserve i for Integer;
reserve a,b,c,d,e,g,p,r,x,y for Real;
reserve z for Complex;

theorem Th6:
  rseq(0,b,0,d).n = b/d
proof
    thus rseq(0,b,0,d).n = (0*n+b)/(0*n+d) by Th5
    .= b/d;
  end;
