@article{Hale_2007, title={A general class of evolutionary equations}, volume={59}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/3307}, abstractNote={Using observable quantities and state variable of a dynamical process, a general evolutionary equation is defined which unifies classical ordinary differential equations, partial differential equations, and hereditary systems of retarded and neutral type. Specific illustrations are given using transmission lines nearest-neighbor coupled at the boundary and the theory of heat transfer in solids. Some spectral theory for linearization of the equations is also discussed.}, number={2}, journal={Ukrains’kyi Matematychnyi Zhurnal}, author={Hale, J. K.}, year={2007}, month={Feb.}, pages={268–288} }