On boundedness of a certain class of Hardy-Steklov type operators in Lebesgue spaces.
Stepanov, V.D., Ushakova, E.P. (2010)
Banach Journal of Mathematical Analysis [electronic only]
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Stepanov, V.D., Ushakova, E.P. (2010)
Banach Journal of Mathematical Analysis [electronic only]
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Song Li (1996)
Colloquium Mathematicae
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Raffoul, Youssef N. (2009)
Banach Journal of Mathematical Analysis [electronic only]
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S. Askhabov (1991)
Colloquium Mathematicae
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Paweł Wójcik, Michail A. Sheshko, Dorota Pylak, Paweł Karczmarek (2012)
Annales UMCS, Mathematica
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In the present paper, we give the exact solutions of a singular equation with logarithmic singularities in two classes of functions and construct formulae for the approximate solutions.
Bartušek, M., Osička, J. (2001)
Georgian Mathematical Journal
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Meskhi, A. (1998)
Georgian Mathematical Journal
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Kokilashvili, V., Meskhi, A. (2001)
Georgian Mathematical Journal
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Bartušek, Miroslav (2006)
Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
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Hans Jarchow (2004)
Extracta Mathematicae
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Nils Dencker (2003)
Journées équations aux dérivées partielles
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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)...