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By Carlos Simpson

This publication issues the query of the way the answer of a process of ODE's varies while the differential equation varies. The objective is to offer nonzero asymptotic expansions for the answer when it comes to a parameter expressing how a few coefficients visit infinity. a selected classof households of equations is taken into account, the place the reply shows a brand new type of habit no longer obvious in so much paintings identified in the past. The concepts comprise Laplace rework and the tactic of desk bound part, and a combinatorial process for estimating the contributions of phrases in an unlimited sequence growth for the answer. Addressed basically to researchers inalgebraic geometry, traditional differential equations and complicated research, the e-book can also be of curiosity to utilized mathematicians engaged on asymptotics of singular perturbations and numerical resolution of ODE's.

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Additional info for Asymptotic Behavior of Monodromy: Singularly Perturbed Differential Equations on a Riemann Surface

Example text

For each such index let Zz be the space Z n. =llz, I We will work with chains which are combinations of singular and de Rham chains. Our manifolds will have linear structures, in other words embeddings as open sets in vector spaces. By a k-chain on such a manifold Y we will mean a linear functional on the space of C ~ differential k-forms on Y which can be expressed as a sum of components of the following form h(u * H). Here H is a k + l dimensional space, compact, with linear structure and algebraic boundary, together with h : H --, Y a smooth algebraic map (in other words the map is given by coordinate functions which are algebraic over the ring of polynomial functions on H).

Let r e ( l ) , . . ,re(q) d e n o t e the indices such t h a t 1,~ < / ~ - 1 . ) T h e re(i) are an increasing sequence between 1 and r, so there are less t h a n C" possibilities. T h u s we m a y assume t h a t the re(i) are fixed. If i > re(a) t h e n ki-1 (_ Im(,) + i - re(a). In p a r t i c u l a r / , _(Ira(,) + i - re(a), so m(a + 1) ___ re(a). Therefore the sequence {Im(~)- re(a)} is increasing. F u r t h e r m o r e - r _< l m ( , ) re(a) (_ n + r so the n u m b e r of choices of the sequence Im(~) is b o u n d e d by C "+'.

A , respectively. We now list the conditions for nondegeneracy, and then count the number of pairs of sequences {ki}, {/i} which satisfy those conditions. For the purposes of this argument, consider the left side edges to have been assigned the number 1 and the right side edges to have been assigned the number O. First of all, if Ij > kj-1 then the cell is degenerate. For then the picture is one of sj+l 0 L° Sj + l 57 s kj > kj-i 1 with t h e possibilities for the result of choosing k i < k i _ l , k s = kj_~, or k i > ki_x , shown in order.

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