 96383 Hans Koch
 A Renormalization Group for Hamiltonians, with Applications to KAM Tori
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Aug 22, 96

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Abstract. We describe a family of renormalization group transformations
which apply to the problem of stability of invariant tori
for analytic Hamiltonians.
Each of these transformations corresponds to a fixed rotation vector,
within a certain class of vectors in R^d.
As an application, we prove a KAMtype theorem that yields
analytic invariant dtori depending analytically on the Hamiltonian.
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