Abstract
Let G ∞ be the group of one parameter identity-tangent diffeomorphisms on the line whose coefficients are formal Laurent series in the parameter ε with a pole of finite order at 0. It is well-known that the Birkhoff decomposition can be defined in such a group. We investigate the stability of the Birkhoff decomposition in subgroups of G ∞ and give a formula for this decomposition. As proven by A. Connes and D. Kreimer, the Birkhoff decomposition is related to renormalization in quantum field theory and we give an application of our results in the last section. To cite this article: F. Menous, C. R. Acad. Sci. Paris, Ser. I 342 (2006).
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