<p>This article deals with two problems related with germs of foliations induced by real–analytic vector fields in <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\((\mathbb {R} ^2,0)\)</EquationSource> </InlineEquation> having singularity at 0 of order <i>n</i>, <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(n\ge 2\)</EquationSource> </InlineEquation>. We will denote this class of vector fields by <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\mathcal {A}_n\)</EquationSource> </InlineEquation>. The goal of the first problem is to obtain a set of real–analytic invariants, called <i>real–analytic Thom’s invariants</i>, that allow us to achieve the real–analytic classification of vector fields satisfying genericity assumptions in a subclass <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(\mathcal {A}^0_n\)</EquationSource> </InlineEquation> of <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(\mathcal {A}_n\)</EquationSource> </InlineEquation>. The second problem we deal with is called <i>the realization problem</i>, which consists in constructing a real analytic vector field having as real–analytic invariants a suitable group <i>G</i> of conformal mappings and a collection <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(\{\alpha _{ij}\}\)</EquationSource> </InlineEquation> of <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\((n-3)(n-2)/2\)</EquationSource> </InlineEquation> real constants that are given in advance.</p>

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Analytic Invariants for Real-Analytic Germs of Vector Fields in \((\mathbb {R}^{2}, 0)\)

  • Guadalupe Martínez Salgado

摘要

This article deals with two problems related with germs of foliations induced by real–analytic vector fields in \((\mathbb {R} ^2,0)\) having singularity at 0 of order n, \(n\ge 2\) . We will denote this class of vector fields by \(\mathcal {A}_n\) . The goal of the first problem is to obtain a set of real–analytic invariants, called real–analytic Thom’s invariants, that allow us to achieve the real–analytic classification of vector fields satisfying genericity assumptions in a subclass \(\mathcal {A}^0_n\) of \(\mathcal {A}_n\) . The second problem we deal with is called the realization problem, which consists in constructing a real analytic vector field having as real–analytic invariants a suitable group G of conformal mappings and a collection \(\{\alpha _{ij}\}\) of \((n-3)(n-2)/2\) real constants that are given in advance.