2 problems

Let … The set $\mathcal{C}\mathcal{S}$ parametrizes standard Cappell–Shaneson matrices via $(c,d,n)\mapsto X_{c,d,n}$. Let $\sim$ denote Gompf equivalence on…

A Cappell–Shaneson matrix is a matrix $A\in SL(3;\mathbb{Z})$ satisfying $\det(A-I)=1$. Two such matrices are Gompf equivalent when they are related by Gompf's equivalence relation…