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Periodic solutions for indefinite singular equations with singularities in the spatial variable and non-monotone nonlinearity
(American Institute of Mathematical Sciences, 2018-10)
TWe prove the existence of T−periodic solutions for the second order non-linear equation u0 1 − u02 0 = h(t)g(u), where the non-linear term g has two singularities and the weight function h changes sign. We find a relation ...
On Dirichlet problems with singular nonlinearity of indefinite sign
(2015)
Let Ω be a smooth bounded domain in RN , N ≥ 1, let K, M be two nonnegative functions and let α, γ > 0. We study existence and nonexistence of positive solutions for singular problems of the form −Δu = K(x)u−α − λM (x)u−γ ...
The spectrum of the p-Laplacian with singular weight
(Pergamon-elsevier Science LtdOxfordInglaterra, 2012)
A geometric representation of improper indefinite affine spheres with singularities
(2011)
Given a pair of planar curves, one can define its generalized area distance, a concept that generalizes the area distance of a single curve. In this paper, we show that the generalized area distance of a pair of planar ...
Ray tracing in anisotropic media with singularities
(2001)
Singularities often cause trouble in tracing rays in inhomogeneous anisotropic media. The ray-tracing algorithms can break down in the vicinity of the singularities because the medium becomes nearly degenerate and the ...
On the existence and multiplicity of solutions with some type of recurrence for second-order indefinite singular equationsExistencia y multiplicidad de soluciones con algún tipo de recurrencia para ecuaciones diferenciales singulares de segundo orden
(2018)
In this thesis firstly we study the existence of T−periodic solutions to the second order differential equation $$u′′ =\frac{ h(t)}{u^\lambda}.$$ Here $h \in L(\mathbb{R}/T\mathbb{Z})$ is a piecewise constant sign-changing ...
Nombres escuetos en contextos no verídicosBare nouns in non-veridical contexts
(Universidade de Santiago de Compostela, 2021-10-29)
En el presente trabajo analizamos la distribución de los nombres contables en singular sin determinante bajo el alcance de la negación en español (e. g., No leí libro mejor que este). Nuestra propuesta es que estos nombres ...
Stability of the Einstein static universe in the presence of vacuum energy
(2009)
The Einstein static universe has played a central role in a number of emergent scenarios recently put forward to deal with the singular origin of the standard cosmological model. Here we study the existence and stability ...