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Modules over rings of differential operators.

2 votes
1 answer
99 views

The commutativity of minimal extension and direct image by blowing-down

Let $X$ be a sooth algebraic variety over $\mathbb{C}$. Let us assume that there exists the commutative diagram $\require{AMScd}$ \begin{CD} U @>{i}>> \hat{X}\\ @| @VV{\phi}V\\ U @>{j}>> X \end{CD} w …
3 votes
1 answer
263 views

Is direct image of simple $D$-module is also simple?

(I have asked the question The commutativity of minimal extension $\cdots$ and I simplify this question to the next simple question:) Let $X$ be a rational variety over $\mathbb{C}$, $\phi : \hat{X} …