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

theorem Th36:
  m * n = 325 implies m = 1 & n = 325
                   or m = 5 & n = 65
                   or m = 13 & n = 25
                   or m = 25 & n = 13
                   or m = 65 & n = 5
                   or m = 325 & n = 1
  proof
    assume
A1: m*n = 325;
    m divides m*n;
    then m = 1 or m = 5 or m = 13 or m = 25 or m = 65 or m = 325 by A1,Th22;
    hence thesis by A1;
  end;
