The answer to exercise marked [BB] can be found in the Back of the Book.
True or false? Explain your answers.
(a) For all n ∈ N, n > 1, there exists a prime p such that p |n.
(b) [BB] There exists a prime p such that p | n for all n ∈ N, n > 1.
(The position of the universal quantifier makes a world of difference!)
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