Netted matrices.
New families of integer matrices whose leading principal minors form some well-known sequences.
Nonexistence results for Hadamard-like matrices.
Normalizers of Modular Groups.
Norms in Quadratic Fields and Their Relations to Non Commuting 2x2 Matrices I.
Note on some greatest common divisor matrices
Some quadratic forms related to "greatest common divisor matrices" are represented in terms of L²-norms of rather simple functions. Our formula is especially useful when the size of the matrix grows, and we will study the asymptotic behaviour of the smallest and largest eigenvalues. Indeed, a sharp bound in terms of the zeta function is obtained. Our leading example is a hybrid between Hilbert's matrix and Smith's matrix.
Notes on power LCM matrices
Notes on the divisibility of GCD and LCM matrices.