Career
His area of contributions embraced nonlinear singular integral equations, differential equations, potential theory and functional analysis. Huseynov was first to study the nonlinear Hilbert problem as applied to analytic functions. He also created the Hα, β, γ function space and proved some theorems for nonlinear singular integral equations with Cauchy kernel within that space.
Huseynov held positions in some Azerbaijani scientific institutions.