. "Path Integral" . . "Path integral formulation" . "quantum paths (or quantum trajectory)" . . . . . "Euclidean path-integral formulation" . "path integral representation" . . "quantum path integral formalism" . "configuration space" . "path-integral methods" . . "quantum mechanical underpinning" . . "path-integral view of dynamics" . . . "path integral quantization" . "path integral formalism" . "quantum path integral" . . "Path integral formulation" . "path-integral approach" . . "path integral approach" . "path integral formulation of quantum mechanics" . . . "path integration" . . . "Feynman path integral" . . . "Path integral" . . "path integral formulation" . "path integral" . "sum-over-histories" . . "path integrals" . "sum-over-paths" . "Feynman integrals" . . "Path Integral Formulation" . "Feynman\u2019s path integral expression" . "path integal" . "sum over the histories" . . . . . "Path-integral" . . "Feynman integral approach" . . . "propagator formalism" . "world line formulation of quantum field theory" . "Feynman\u2019s Path Integrals" . "Path integral formulation of quantum mechanics" . "Feynman Integrals" . . "deduced in quantum physics" . "Feynman integral" . . . "Feynman path integrals" .