Hipoeliticidade global e vetores simultaneamente aproximáveis
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Universidade Federal de São Carlos
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A necessary and sufficient condition is given for a sum of squares operator to be globally hypoelliptic. This condition is expressed in terms of Diophatine approximation properties of the coefficients. The proof of the Theorem is based on L2− estimates.
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SIMSEN, Jacson. Hipoeliticidade global e vetores simultaneamente aproximáveis. 2003. 57 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2003.
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