Singularity categories of deformations of Kleinian singularities

Simon Crawford

Let $G$ be a finite subgroup of $\text{SL}(2,\mathbb{k})$ and let $R=\mathbb{k}[x,y{]}^G$ be the coordinate ring of the corresponding Kleinian singularity. In 1998, Crawley-Boevey and Hollan…