Zdzislaw Jackiewicz

Zdzislaw Jackiewicz is a mathematician working in numerical analysis whose work includes methods for ordinary differential equations, delay differential equations and Volterra integral equations. His authored account of general linear methods describes a framework combining internal stage evaluations with a vector of information passed between successive time steps.^[ref]

For $y^{\prime }=f(y)$, a Runge-Kutta method passes an approximation to $y$ between steps while computing several intermediate stages. A linear multistep method instead retains values from several earlier times. General linear methods put both patterns in one matrix formulation, allowing accuracy and numerical stability to be designed together. His Arizona State University profile identifies this subject and the construction of implicit-explicit methods as research interests.^[ref]