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Note on blow-up of solutions for a porous medium equation with convection and boundary flux

Zhiyong WangJingxue Yin — 2012

Colloquium Mathematicae

De Pablo et al. [Proc. Roy. Soc. Edinburgh Sect. A 138 (2008), 513-530] considered a nonlinear boundary value problem for a porous medium equation with a convection term, and they classified exponents of nonlinearities which lead either to the global-in-time existence of solutions or to a blow-up of solutions. In their analysis they left open the case of a certain critical range of exponents. The purpose of this note is to fill this gap.

Positive solutions for one-dimensional singular p-Laplacian boundary value problems

Huijuan SongJingxue YinRui Huang — 2012

Annales Polonici Mathematici

We consider the existence of positive solutions of the equation 1 / λ ( t ) ( λ ( t ) φ p ( x ' ( t ) ) ) ' + μ f ( t , x ( t ) , x ' ( t ) ) = 0 , where φ p ( s ) = | s | p - 2 s , p > 1, subject to some singular Sturm-Liouville boundary conditions. Using the Krasnosel’skiĭ fixed point theorem for operators on cones, we prove the existence of positive solutions under some structure conditions.

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