2 papers
math-ph2026
Electron-photon interaction: Feynman diagrams and contact points
Lev Sakhnovich
In this note, we formulate the notions of the direct and inverse problems and contact points for the Feynman diagrams. For the electron-photon interaction case, the solutions of th…
math.CA2024
Differential equations on a -dimensional torus: Poincaré type results
Lev Sakhnovich
Ordinary differential equations of the first order on the torus have been investigated in detail by H. Poincaré and A. Denjoy. The long-standing problem of generalising these resul…