reserve x for set;
reserve a, b, c, d, e for Real;
reserve m, n, m1, m2 for Nat;
reserve k, l for Integer;
reserve p for Rational;

theorem Th22:
  a>0 & n>=1 implies n-root a - 1 <= (a-1)/n
proof
  assume
A1: a>0 & n>=1;
then  n -Root a - 1 <= (a-1)/n by PREPOWER:31;
  hence thesis by A1,Def1;
end;
