Index of binary differential equations / Índice de equações diferenciais binárias

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

In this work we study binary differential equations in a neighborhood of an isolated singular point. Following the geometric approach of Bruce and Tari in their work on multiplicity of a binary differential equation, we introduce a new definition of index for this class of equations, which coincides with the classical definition by Hopf for positive binary differential equations. The main result is a formula expressing the index in terms of information obtained from the coefficients of the original equation. The invariance of the index by smooth equivalences is also proved. Some results relating the index with the indices of 1-forms and vector fields in singular varieties are given for a special class of implicit differential equations

ASSUNTO(S)

equações diferenciais implícita implicit differential equations

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