I study a course about commutative algebra, and I saw many questions as the following:
Find an example of a $\mathbb{Q}\left[\lambda_1,\lambda_2\right]$-module with $\ell\left(M\right)=3$ (i.e., $M$ has a composition series of length 3.
Can you please help me find such an example? And do you have any guidelines about how to approach such a question?
Thanks.