Аннотация:The possibility of applying the homotopy (deformation) method to studying the invariance of extremals for a generalized system of equations of relativistic electrodynamics is considered. This approach allows to investigate the stability of extremals for the action functional.
https://doi.org/10.1088/1742-6596/1141/1/012118
http://iopscience.iop.org/article/10.1088/1742-6596/1141/1/012118/meta
http://iopscience.iop.org/issue/1742-6596/1141/1