if n belongs to integer and n is not equal to 0, prove that n can be written uniquely in the form n=2^k * m, where k>=0 and m is odd.
P.S. WHY do you keep labeling these abstract algebra???? I get all excited to answer a question on free groups or something and when I get here....number theory . Juts becuase you are doing something in an abstract algebra course does it mean it is abstract algebra.