Matrices associated with classes of arithmetical functions (Q1310838)

Let \(S=\{x_ 1,x_ 2,\dots,x_ n\}\) be a set of distinct positive integers. The authors investigate the structures, determinants and inverses of \(n\times n\) matrices \([\Psi(x_ i,x_ j)]\) when \(\Psi\) is of the form \(\Psi(m,r)= \sum_{d\mid(m,r)} f(d)g(m/d)h(r/d)\) and when \(\Psi\) belongs to Cohen's classes of even and completely even functions \(\pmod r\). The classical Smith's determinant is obtained as a special case. The authors also study \(n\times n\) matrices \([f(x_ i x_ j)]\) which have \(f\) evaluated at the product \(x_ i x_ j\) and where \(f\) is a specially multiplicative function or a quadratic function, that is, the Dirichlet convolution of two completely multiplicative functions.