4 research outputs found

    Controllability of invariant control systems at uniform time

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    summary:Let GG be a compact and connected semisimple Lie group and Σ\Sigma an invariant control systems on GG. Our aim in this work is to give a new proof of Theorem 1 proved by Jurdjevic and Sussmann in [6]. Precisely, to find a positive time sΣs_{\Sigma } such that the system turns out controllable at uniform time sΣs_{\Sigma }. Our proof is different, elementary and the main argument comes directly from the definition of semisimple Lie group. The uniform time is not arbitrary. Finally, if A=t>0A(t,e) A=\bigcap _{ t > 0}A(t,e) denotes the reachable set from arbitrary uniform time, we conjecture that it is possible to determine AA as the intersection of the isotropy groups of orbits of GG-representations which contains exp(z)\exp (\mathfrak{z}), where z\mathfrak{z} is the Lie algebra determined by the control vectors

    Isosceles triangles in Riemannian geometry – a characterization of the n-sphere

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    Padrão observado no uso de habitats por espécies migradoras e sedentárias em lagos de várzea.

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    Consideradas ricos ecossistemas da bacia amazônica, as áreas de várzea são formadas por rios de água branca, influenciadas diretamente pelo pulso hidrológico e comportam grande diversidade animal e vegetal. Dentro da diversidade ictíica temos: espécies sedentárias, que passam boa parte do seu ciclo de vida em lagos e espécies com necessidades migratórias, que necessitam realizar migrações sazonais. Serão realizadas coletas em seis lagos de várzea localizados ao longo do rio Solimões entre os municípios de Iranduba e Manacapuru. Para cada lago ocorrerão 4 pescarias por ano, com esforço de pesca padronizado em todas as amostragens, com o uso de rede de espera uma a cada estação hidrológica em duas fisionomias de habitats comum as áreas de várzea: água aberta, vegetação aquática e floresta alagada. Após a captura será realizado a identificação e biometria dos peixes, uso de estatística descritiva, verificar a constância das espécies e análise multivariada.Voluntári

    Controllability of invariant control systems at uniform time

    Get PDF
    summary:Let GG be a compact and connected semisimple Lie group and Σ\Sigma an invariant control systems on GG. Our aim in this work is to give a new proof of Theorem 1 proved by Jurdjevic and Sussmann in [6]. Precisely, to find a positive time sΣs_{\Sigma } such that the system turns out controllable at uniform time sΣs_{\Sigma }. Our proof is different, elementary and the main argument comes directly from the definition of semisimple Lie group. The uniform time is not arbitrary. Finally, if A=t>0A(t,e) A=\bigcap _{ t > 0}A(t,e) denotes the reachable set from arbitrary uniform time, we conjecture that it is possible to determine AA as the intersection of the isotropy groups of orbits of GG-representations which contains exp(z)\exp (\mathfrak{z}), where z\mathfrak{z} is the Lie algebra determined by the control vectors
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