Module isomorphism and length of tensor product.
See image: Why is the isomorphism of $\Psi_A$ modules true and how do we show the length equality? Notation: $A$ is a commutative, Noetherian, local ring together with a surjective homomorphism to a discrete valuation ring: $\lambda: A \rightarrow \mathcal{O} , p_A=ker(\lambda), I_A= Ann[p_A]$ (the annihilator of the kernel of the map), $\Psi_A=\mathcal{O}/\lambda(I_A), M[I]=\{m \in M: mi=0, \forall i \in I\}$ (for every ideal $I$ of $A$), $\hat{\Psi}_A= \frac{M}{M[I_A]+I_AM}$. Please let me know if you need to know any more facts.
152
Answer
Answers can only be viewed under the following conditions:
- The questioner was satisfied with and accepted the answer, or
- The answer was evaluated as being 100% correct by the judge.
779
The answer is accepted.
Join Matchmaticians Affiliate Marketing
Program to earn up to a 50% commission on every question that your affiliated users ask or answer.
- answered
- 954 views
- $30.00
Related Questions
- When is Galois extension over intersection of subfields finite
- Linearly independent vector subsets.
- How do you go about solving this question?
- Clock Problem
- Algebra Word Problem #1
- Let $z = f(x − y)$. Show that $\frac{\partial z}{\partial x}+\frac{\partial z}{\partial y}=0$
- I really can't figure out equations with a power of 2 in it, please solve these and explain every step as if I was a baby.
- Representation theory question