Infinitesimal Lyapunov functions for singular flows |
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Authors: | Vitor Araujo Luciana Salgado |
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Institution: | 1. Instituto de Matemática, Universidade Federal da Bahia, Av. Adhemar de Barros, S/N, Ondina, 40170-110, Salvador, BA, Brazil 2. Instituto de Matemática Pura e Aplicada, Estrada Dona Castorina, 110, Jardim Botanico, Rio de Janeiro, 22460-320, Brazil
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Abstract: | We present an extension of the notion of infinitesimal Lyapunov function to singular flows, and from this technique we deduce a characterization of partial/sectional hyperbolic sets. In absence of singularities, we can also characterize uniform hyperbolicity. These conditions can be expressed using the space derivative $DX$ of the vector field $X$ together with a field of infinitesimal Lyapunov functions only, and are reduced to checking that a certain symmetric operator is positive definite at the tangent space of every point of the trapping region. |
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