4 problems

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…

Let $V$ be a two-dimensional complex vector space and let $\Gamma$ be a finite subgroup of $SL(2,\mathbb{C})$, so that $V/\Gamma$ is a Kleinian singularity. Let…

Let $Y=\mathbb{C}^2/\Gamma$, where $\Gamma$ is a finite subgroup of $\operatorname{SL}_2(\mathbb{C})$, and let $\mathfrak{h}_\Gamma^*$ be the Cartan space associated with the ADE t…