The answer to exercise marked [BB] can be found in the Back of the Book.
Let a and b be natural numbers.
(a) Find the prime decomposition of lcm (a, b)in terms of the prime decompositions of a and b and prove your answer. (See Problem 17, p. 118.)
(b) Use (a) to prove formula (2) of Section 4.2 in the case et, b > 0: gcd (a, b)lcm(a, b)= ab.
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