1) In F[x] where F is a field, if f is irreducible and whenever f=gh for some g,h in F[x], then g is a unit or _____. 2) In F[x], f is a unit in F[x] if and only if f is a/an ______. 3) Let f be in ℤ[x]. We say that f is irreducible over ℤ if and only if f is ____ and f is irreducible over ℚ. 4) R must be at least a/an _____ so that deg(fg) = deg(f)+deg(g) for f,g in R[x]. 5) We say that r is a _____ iff f(r)=0

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Complete each statement by filling in each blank with the correct word or phrase to give it a logical sense. Use lowercase letters.

1) In F[x] where F is a field, if f is irreducible and whenever f=gh for some g,h in F[x], then g is a unit or _____.
2) In F[x], f is a unit in F[x] if and only if f is a/an ______.
3) Let f be in ℤ[x]. We say that f is irreducible over ℤ if and only if f is ____ and f is irreducible over ℚ.
4) R must be at least a/an _____ so that deg(fg) = deg(f)+deg(g) for f,g in R[x].
5) We say that r is a _____ iff f(r)=0 and f'(r)≠0.

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