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Mathematics Subject Classification: 26A33; 70H03, 70H25, 70S05; 49S05We treat the fractional order differential equation that contains the left
and right Riemann-Liouville fractional derivatives. Such equations arise as
the Euler-Lagrange equation in variational principles with fractional derivatives.
We reduce the problem to a Fredholm integral equation and construct
a solution in the space of continuous functions. Two competing approaches
in formulating differential equations of fractional order...
We study a variational problem which was introduced by Hannon,
Marcus and Mizel [ESAIM: COCV9 (2003) 145–149] to
describe step-terraces on surfaces of so-called “unorthodox” crystals.
We show that there is no nondegenerate intervals on which the absolute
value of a minimizer is identically.
In this Note, by using a generalization of the classical Fermat principle, we prove the existence and multiplicity of lightlike geodesics joining a point with a timelike curve on a class of Lorentzian manifolds, satisfying a suitable compactness assumption, which is weaker than the globally hyperbolicity.
The present part of the paper completes the discussion in Part I in two directions. Firstly, in Section 5 a number of existence theorems for a solution to Problem III (principle of minimum potential energy) is established. Secondly, Section 6 and 7 are devoted to a discussion of both the classical and the abstract approach to the duality theory as well as the relationship between the solvability of Problem III and its dual one.
In recent ten years, there has been much concentration and increased research activities on Hamilton’s Ricci flow evolving on a Riemannian metric and Perelman’s functional. In this paper, we extend Perelman’s functional approach to include logarithmic curvature corrections induced by quantum effects. Many interesting consequences are revealed.
The paper deals with solutions of transonic potential flow problems handled in the weak form or as variational inequalities. Using suitable generalized methods, which are well known for elliptic partial differential equations of the second order, some properties of these solutions are derived. A maximum principle, a comparison principle and some conclusions from both ones can be established.
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