3 problems

Physicists' Euler number conjecture. One has

Let $(X,D,x)$ be a germ of log canonical surface singularity with $\mathbb{Q}$-boundary. Borbon–Spotti conjecture. … The conjecture relates Langer's local orbifold Euler number to…

Let $f$ be an invertible polynomial in $n$ variables, let $G\subset G_f$ be a group of diagonal symmetries, and let $S\subset S_n$ preserve $f$ and $G$. Let…