Browsing Matemática - PPGM by Subject "Vetores simultaneamente aproximáveis"
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Hipoeliticidade global e vetores simultaneamente aproximáveis.
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Matemática - PPGM, , 11/08/2003)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 ...