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Irreducibility of the punctual quotient scheme of a surface

Irreducibility of the punctual quotient scheme of a surface

It is shown that the punctual quotient scheme Q ${}_{l}^{r}$ parametrizing all zero-dimensional quotients $\mathcal{O}_{A^2 }^{ \oplus ^r } \to T$ of length l and supported at some fixed point O∈A2 in the plane is irreducible.