On some definitions in matrix algebra
Jan R. Magnus, Karim Maher Abadir · RePEc: Research Papers in Economics · 2007
Many definitions in matrix algebra are not standardized. This notediscusses some of thepitfalls associated with undesirable orwrong definitions, anddealswith central conceptslikesymmetry, orthogonality, square root, Hermitian and quadratic forms, and matrix derivatives.