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Singular functions on metric measure spaces.

Ilkka Holopainen, Nageswari Shanmugalingam (2002)

Collectanea Mathematica

On relatively compact domains in metric measure spaces we construct singular functions that play the role of Green functions of the p-Laplacian. We give a characterization of metric spaces that support a global version of such singular function, in terms of capacity estimates at infinity of such metric spaces. In addition, when the measure of the space is locally Q-regular, we study quasiconformal invariance property associated with the existence of global singular functions.

Singular sets of separately analytic functions

Zbigniew Błocki (1992)

Annales Polonici Mathematici

We complete the characterization of singular sets of separately analytic functions. In the case of functions of two variables this was earlier done by J. Saint Raymond and J. Siciak.

Singularité et intégrabilité des fonctions plurisousharmoniques

Mongi Blel, Saoud K. Mimouni (2005)

Annales de l’institut Fourier

On étudie les singularités et l’intégrabilité d’une classe de fonctions plurisousharmoniques sur une variété analytique X de dimension n 1 . Pour étudier ce problème, nous commençons par contrôler les nombres de Lelong de certains types de fonctions plurisousharmoniques ϕ . Ensuite, nous étudions les singularités du transformé strict du courant d d c ϕ par un éclatement de X au dessus d’un point. Nous répondons ainsi positivement au problème d’intégrabilité locale de e - ϕ , lorsque dim X = 2 , et lorsque ϕ est une fonction plurisousharmonique...

Smale's Conjecture on Mean Values of Polynomials and Electrostatics

Dimitrov, Dimitar (2007)

Serdica Mathematical Journal

2000 Mathematics Subject Classification: Primary 30C10, 30C15, 31B35.A challenging conjecture of Stephen Smale on geometry of polynomials is under discussion. We consider an interpretation which turns out to be an interesting problem on equilibrium of an electrostatic field that obeys the law of the logarithmic potential. This interplay allows us to study the quantities that appear in Smale’s conjecture for polynomials whose zeros belong to certain specific regions. A conjecture concerning the electrostatic equilibrium...

Smooth potentials with prescribed boundary behaviour.

Stephen J. Gardiner, Anders Gustafsson (2004)

Publicacions Matemàtiques

This paper examines when it is possible to find a smooth potential on a C1 domain D with prescribed normal derivatives at the boundary. It is shown that this is always possible when D is a Liapunov-Dini domain, and this restriction on D is essential. An application concerning C1 superharmonic extension is given.

Smoothness of Green's functions and Markov-type inequalities

Leokadia Białas-Cież (2011)

Banach Center Publications

Let E be a compact set in the complex plane, g E be the Green function of the unbounded component of E with pole at infinity and M ( E ) = s u p ( | | P ' | | E ) / ( | | P | | E ) where the supremum is taken over all polynomials P | E 0 of degree at most n, and | | f | | E = s u p | f ( z ) | : z E . The paper deals with recent results concerning a connection between the smoothness of g E (existence, continuity, Hölder or Lipschitz continuity) and the growth of the sequence M ( E ) n = 1 , 2 , . . . . Some additional conditions are given for special classes of sets.

Smoothness of the Green function for a special domain

Serkan Celik, Alexander Goncharov (2012)

Annales Polonici Mathematici

We consider a compact set K ⊂ ℝ in the form of the union of a sequence of segments. By means of nearly Chebyshev polynomials for K, the modulus of continuity of the Green functions g K is estimated. Markov’s constants of the corresponding set are evaluated.

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