
theorem Th3:
  for n being non zero Nat
   ex k being Nat,
      l being odd Nat st n = l * 2|^k
proof
let n be non zero Nat;
consider a,b being Nat such that
A1: n = (2|^a)*(2*b+1) by NAGATA_2:1;
take a,2*b+1;
thus thesis by A1;
end;
