Schneider, Baruch2023-06-162023-06-1620051072-6691https://hdl.handle.net/20.500.14365/3263We give a short proof of a formula of Poincare-Bertrand in the setting of time-harmonic solutions of the relativistic Dirac equation on a piecewise Liapunov surface, as well as for some versions of quaternionic analysis.eninfo:eu-repo/semantics/closedAccessRelativistic Dirac equationCauchy-type integralquaternionic analysisArticle2-s2.0-24344433212