Feynman integrals are mathematical tools used to describe the behavior of particles in quantum field theory. These integrals are named after physicist Richard Feynman, who first introduced them in the ...

Abstract: This appendix explains complex Fresnel integrals. Several forms of Fresnel integrals have been defined by various authors, and as a result, the definition often depends on the application.

In large-scale quantum-chemical calculations, the electron-repulsion integral (ERI) tensor rapidly becomes the bottleneck in terms of memory and disk space. When an external finite magnetic field is ...

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Abstract: The concept of complex time is employed to derive the time domain representation of the Green's function of a periodic structure for the first time. The spatial domain Green's function of ...