All Questions
5 questions
2
votes
0
answers
369
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Extension of subharmonic function: can someone explain the details?
In this paper we have the following situation on page 60. $E$ is a compact subset of $\mathbb{R}^\tau\cup\{\infty\}$ (one point compactification) for $\tau\geq2$, $M_0$ is a point in the boundary of $...
2
votes
1
answer
178
views
Differentiability of the logarithmic potential
Assume $\mu$ is a measure supported on a real finite interval $[a,b]$, and let
$$p_\mu(z)=\int\log|z-t|d\mu(t),$$
denote the logarithmic potential associated to $\mu$. Are there (possibly simple) ...
1
vote
1
answer
337
views
Is this a superharmonic function?
Hi everyone: Let $ \Omega $ be a bounded open set of $ \mathbb{R}^{N} $, $ N\geq2 $, and $ F\subset \Omega $ with empty interior. Suppose there exists a superharmonic function $ u $ on $ \Omega\...
2
votes
1
answer
446
views
Approximation of subharmonic functions
Let $u$ be an (upper semi-continuous) locally bounded subharmonic function in a domain in $\mathbb{R}^n$. Let $\chi_\epsilon$ be a standard smoothing kernel, namely
$$\chi_\epsilon(x)=\frac{c_n}{\...
1
vote
1
answer
199
views
On a limit at the boundary of $\mathbb{D}$ related to complex and harmonic analysis
Let $p(z,t)=\frac{1}{2\pi}.\frac{1-|z|^2}{|z-t|^2}$ be the Poisson kernel on the open unit disk $\mathbb{D}$, fix $0<\alpha<1$ . Let $a\in \partial\mathbb{D}=S^1$ be fixed. Then my question is :
...