On the Frobenius number of some Lucas numerical semigroups.
Ýlhan, Sedat, Kýper, Ruveyde (2008)
Acta Universitatis Apulensis. Mathematics - Informatics
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Ýlhan, Sedat, Kýper, Ruveyde (2008)
Acta Universitatis Apulensis. Mathematics - Informatics
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Mijatović, M., Pilipović, S. (2001)
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Kolmykov, V.A. (2004)
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Benhissi, Ali (2007)
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Daniel Abraham Romano (2005)
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Megan, Mihail, Pogan, Alin (2002)
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Nils Dencker (2003)
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We prove the Nirenberg-Treves conjecture : that for principal type pseudo-differential operators local solvability is equivalent to condition (). This condition rules out certain sign changes of the imaginary part of the principal symbol along the bicharacteristics of the real part. We obtain local solvability by proving a localizable estimate for the adjoint operator with a loss of two derivatives (compared with the elliptic case). The proof involves a new metric in the Weyl (or Beals-Fefferman)...
M. Kostić (2009)
Bulletin, Classe des Sciences Mathématiques et Naturelles, Sciences mathématiques
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