Biquaternionic Analysis, Cyclic Quaternionic Fields, and Generalization of the Kerr–Penrose Theorem

We give a concise introduction to biquaternionic analysis and the so-called algebrodynamical approach to field theory and highlight some of its connections to twistors, shear-free null congruences and classical field/particle dynamics. We also attempt to extend the analysis to another (“cyclic”) class of solutions to the equations of biquaternionic differentiability and explore some of the properties of the associated congruences and static singularities which allow for the construction of classical models of particles.