A study is made of the analytical properties of contributions to the Feynman amplitude from very simple diagrams. The double spectral representation is shown to be valid for the contributions from diagrams 1, 2 under some restrictions as to the mass variables.
Citation Example:Kolomitsev V. I. Analytical properties of contributions to the Feynman amplitude from some very simple diagrams // Ukr. Mat. Zh. - 1962. - 14, № 2. - pp. 129-137.