Thesis Lund. / Imprint on cover: Lund, C. W. K. Gleerup. "A study of problems connected with Riesz' generalization of the Riemann Liouville Integral."--Introd. "References": p. [98]

Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.

Thesis (Ph. D.)--Oregon State University, 2008. / Printout. Includes bibliographical references (leaves 88-95). Also available on the World Wide Web.

Thesis (Ph. D.)--University of Washington, 2000. / Vita. Includes bibliographical references (leaves 142-145).

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Orientador: Paulo Leandro Dattori da Silva / Banca: Juliana Conceição Precioso Pereira / Banca: Evandro Raimundo Silva / Resumo: Não disponível / Abstract: Not available / Mestre

Orientador: Juliana Conceição Precioso Pereira / Coorientador: Andrea Cristina Prokopczyk Arita / Banca: Michelle Fernanda Pierri Hernandez / Banca: Waldemar Donizete Bastos / Resumo: SejamAum operador fechado e densamente definido em um espa¸co de BanachX ef∈L 1 ([0,τ];X). O objetivo deste trabalho e apresentar uma condição necessária e suficiente para a existência de solução weak, dada por J. Ball, do problema { d dt u(t) = Au(t) +f(t), t > 0 u(0) = x. Neste caso, a solução weak coincide com a solução mild (dada pela Fórmula da Variação das Constantes). Como aplicação, estudaremos um problema de valor inicial e de fronteira para equações parabólicas de segunda ordem e concluiremos que sua solução fraca, no sentido usual de EDP's, coincide com a solução mild do problema de Cauchy abstrato associado / Abstract: LetAbe a closed linear operator densely defined on a Banach spaceXand f∈L 1 ([0,τ];X). The purpose of this work is to present a necessary and sufficient condition to the existence of weak solution, introduced by J. Ball, for the problem { d dt u(t) = Au(t) +f(t), t > 0 u(0) = x. In this case, the weak solution coincides with the mild solution (given by the Variation of the Constants Formula) As an application we study an initial boundary value problem for a second order parabolic and conclude that its weak solution, coincides with the mild solution of the associated Abstract Cauchy Problem / Mestre

We discuss Lojasiewicz's beautiful proof of the division theorem for smooth functions. The standard proofs are based on the Weierstrass preparation theorem for analytic functions and use techniques from the theory of partial differential equations. Lojasiewicz's approach is more geometric and syn¬thetic. In the appendices appear new proofs of results which are required for the theorem. / Dissertation (MSc (Mathematics))--University of Pretoria, 2006. / Mathematics and Applied Mathematics / unrestricted

The method of steepest descent is used to solve partial differential equations of mixed type. In the main hypothesis for this paper, H, L, and S are Hilbert spaces, T: H -> L and B: H -> S are functions with locally Lipshitz Fréchet derivatives where T represents a differential equation and B represents a boundary condition. Define ∅(u) = 1/2 II T(u) II^2. Steepest descent is applied to the functional ∅. A new smoothing technique is developed and applied to Tricomi type equations (which are of mixed type). Finally, the graphical outputs on some test boundary conditions are presented in the table of illustrations.