Une expression explicite des fonctions àη points de l’équation dx/dt = η + (α/gn!)x^ν

Summary

Theη-point functions describing the retarded solution of the equation dx/dt = η + (α/gn!)x^ν, whereη is an arbitrary source vanishing fort < 0, α a given function oft andν an integer, are constructed with the help of diagrams, different from Feynman diagrams, associated with explicit expressions, that is expressions free from integrations.