Mathematics · Ring Theory
Let R and S be commutative rings with unity, f : R → S be a surjective ring homomorphism, and Q ⊆ S be a non-zero prime ideal. Which of the following statements is true?
- 1f −1 (Q) is a maximal ideal in R if x 5 = x for all x ∈ R
- 2f −1 (Q) is a maximal ideal in R if R is a finite commutative ring with unity
- 3f −1 (Q) is a maximal ideal in R if R is a PID
- 4f −1 (Q) is a non-zero prime ideal in R✓
Correct answer
f −1 (Q) is a non-zero prime ideal in R
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