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The arborification-coarborification transform: analytic, combinatorial, and algebraic aspects. (English) Zbl 1078.37016
This paper is a long and detailed survey (but presenting also some new formulary) on the so-called arborification/coarborification transforms. Very roughly speaking, taken a non-convergent infinite series of type $\sum A^\omega B_\omega$ (called mould-comould expansion) the arborification/coarborification transform is a way of properly selecting indices to be summed in the mould part $A^\omega$ and in the comould part $B_\omega$ in order to obtain (at least in most of the interesting cases) a convergent series. In the paper under review, the authors try to explain both combinatorial and algebraic aspects of the arborification/coarborification process and give several applications of this technique to analysis. For instance, just to name a few, they apply this process to the linearization of vector fields and diffeomorphisms with diophantine or resonant spectra and to KAM theory. The paper is well organized and each part contains a preamble with heuristic and understandable explanations of what comes. On the other hand, the mathematical part itself might be a little hard for non-experts because of the systematic use of non-standard notations which is not always explained in the present paper.

MSC:
37C99Smooth dynamical systems
34M15Algebraic aspects of ODE in the complex domain
37E20Universality, renormalization
37F50Small divisors, rotation domains and linearization; Fatou and Julia sets
37G05Normal forms
40A05Convergence and divergence of series and sequences
32S65Singularities of holomorphic vector fields and foliations
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