29 resultados para Pseudo-Differential Operators

em Bulgarian Digital Mathematics Library at IMI-BAS


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We study the continuity of pseudo-differential operators on Bessel potential spaces Hs|p (Rn ), and on the corresponding Besov spaces B^(s,q)p (R ^n). The modulus of continuity ω we use is assumed to satisfy j≥0, ∑ [ω(2−j )Ω(2j )]2 < ∞ where Ω is a suitable positive function.

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Mathematics Subject Classification: 35J05, 35J25, 35C15, 47H50, 47G30

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2002 Mathematics Subject Classification: 35S05, 47G30, 58J42.

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Mathematics Subject Classification: 26A33, 45K05, 35A05, 35S10, 35S15, 33E12

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The general ordinary quasi-differential expression M of n-th order with complex coefficients and its formal adjoint M + are considered over a regoin (a, b) on the real line, −∞ ≤ a < b ≤ ∞, on which the operator may have a finite number of singular points. By considering M over various subintervals on which singularities occur only at the ends, restrictions of the maximal operator generated by M in L2|w (a, b) which are regularly solvable with respect to the minimal operators T0 (M ) and T0 (M + ). In addition to direct sums of regularly solvable operators defined on the separate subintervals, there are other regularly solvable restrications of the maximal operator which involve linking the various intervals together in interface like style.

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2000 Mathematics Subject Classification: 42B10, 43A32.

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Toric coordinates and toric vector field have been introduced in [2]. Let A be an arbitrary vector field. We obtain formulae for the divA, rotA and the Laplace operator in toric coordinates.

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Mathematics Subject Classification: 26A33, 47B06, 47G30, 60G50, 60G52, 60G60.

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2000 Mathematics Subject Classification: Primary 26A33, 30C45; Secondary 33A35

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Mathematics Subject Classification: 26A33, 34A25, 45D05, 45E10

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2000 Mathematics Subject Classification: 26A33, 33C60, 44A20

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2010 Mathematics Subject Classification: Primary 35S05, 35J60; Secondary 35A20, 35B08, 35B40.

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2010 Mathematics Subject Classification: 35Q15, 31A25, 37K10, 35Q58.