Let a, b, and c be natural numbers and Prove that
(a) if c divides a and c divides b, then c divides d.
(b) a divides b iff d = a.
(c) if a divides bc and d = 1 then a divides c.
(d) if c divides a and c divides b, then In particular,
(e) for every natural number n, gcd(an, bn) = dn.
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