KSBA surfaces with elliptic quotient singularities, ${\pi }_1=1$, $p_g=0$, and $K^2=1,2$

Arié Stern, Giancarlo Urzúa

Among log canonical surface singularities, the ones which have a rational homology disk smoothing are the cyclic quotient singularities $\frac{1}{n^2}(1,na-1)$ with gcd$(a,n)=1$, a…