Displaying similar documents to “On the sharpness of the Stolz approach.”

Martin boundary associated with a system of PDE

Allami Benyaiche, Salma Ghiate (2006)

Commentationes Mathematicae Universitatis Carolinae

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In this paper, we study the Martin boundary associated with a harmonic structure given by a coupled partial differential equations system. We give an integral representation for non negative harmonic functions of this structure. In particular, we obtain such results for biharmonic functions (i.e. ▵ 2 ϕ = 0 ) and for non negative solutions of the equation ▵ 2 ϕ = ϕ .

Forcing in the alternative set theory. I

Jiří Sgall (1991)

Commentationes Mathematicae Universitatis Carolinae

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The technique of forcing is developed for the alternative set theory (AST) and similar weak theories, where it can be used to prove some new independence results. There are also introduced some new extensions of AST.