Upper and lower solutions method for a class of singular fractional boundary value problems with -Laplacian operator.
Existence of concave positive solutions for boundary value problem of nonlinear fractional differential equation with -Laplacian operator.
Positive solution to nonzero boundary values problem for a coupled system of nonlinear fractional differential equations.
A large data regime for nonlinear wave equations
We also exhibit a set of localized data for which the corresponding solutions are strongly focused, which in geometric terms means that a wave travels along an specific incoming null geodesic in such a way that almost all of the energy is concentrated in a tubular neighborhood of the geodesic and almost no energy radiates out of this neighborhood.
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