On the rigidity of certain Pham-Brieskorn rings

Michael Chitayat, Daniel Daigle

Fix a field $k$ of characteristic zero. If $a_1,...,a_n$ ($n>2$) are positive integers, the integral domain $B=k[X_1,...,X_n]/(X_1^{a_1}+...+X_n^{a_n})$ is called a P…