3 problems

Let $\mathfrak{M}_0$ be a Nakajima quiver variety resolved by a smooth Nakajima quiver variety $\mathfrak{M}\to\mathfrak{M}_0$. Let $S_{\mathfrak{M}_0}$ be the torus acting on…

Let $0 \in J \subseteq I$ and set $K \coloneqq I \setminus J$. Let $X_J$ be the corresponding partial resolution of the Kleinian singularity, let $g:X_J\to X_0$ be the natural morp…

Let $0 \in J \subseteq J' \subseteq I$, set $K \coloneqq I \setminus J$ and $K' \coloneqq I \setminus J'$, and let $\sigma_{K,K'}$ be the cone defined by … Let…