Suppose first that 𝑓 ∈ ℚ[𝑥]. As we have seen, we may factorize 𝑓 in an essentially unique way into irreducible factors. Further, 𝑓 can be written as λg, where λ ∈ ℚ and 𝑔 is a primitive element of ℤ[𝑥].
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