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2 votes

Jensen formula in $\mathbb{C}^n$?

See, for example, L. Ronkin, Introduction to the theory of entire functions of several variables, AMS 1974, MR0346175 Ch. I section 3, and Ch. IV, section 4. Other books on entire functions of severa …
Alexandre Eremenko's user avatar
5 votes
Accepted

Extension of pluriharmonic functions

Your condition $\dim M>2$ does not save the situation: you can have many counterexamples with $M=M'\times C^n$ where $\dim M'=1$ and your functions are independent of the second variable. And in dimen …
Alexandre Eremenko's user avatar
2 votes

Why do we study biholomorphically invariant pseudodistances/metrics

Invariant metrics and pseudometrics are used to study holomorphic maps between complex manifolds. The model is the use of the hyperbolic metric in dimension 1. For example, a manifold is called hyperb …
Alexandre Eremenko's user avatar
15 votes
Accepted

Fundamental motivation for several complex variables

On my opinion, there are two very general reasons why analytic functions are important. Solutions of many (almost all) important differential (and functional) equations are analytic. For example, …
1 vote

Can any plurisubharmonic function be represented as a sum of non-positive plurisubharmonic f...

(Edit). I think the answer is no. Let $\Omega$ be a region in the plane, and let me use positive superharmonic functions $F=-f,U=-u,V=-v$. Then your question is whether you can write a positive super …
Alexandre Eremenko's user avatar
3 votes
Accepted

A question about Lelong number

Your first question is unclear. The answer to the second question is positive: you can have a plurisubharmonic function such that $f(x_k)=-\infty$ on some sequence $x_k\to 0$. For this function $\lims …
Alexandre Eremenko's user avatar
4 votes
Accepted

Practically calculating the domain of a power series for function of several complex variables

The usual Cauchy-Hadamard formula has a generalization to several variables. The numbers $r_1,\ldots,r_n$ are called conjugate radii of convergence if the series converges in the open polydisk $B(r_1, …
Alexandre Eremenko's user avatar
3 votes

Holomorphic Sard's theorem 2

If you mean that your function $w$ vanishes on the critical values and nowhere else, then the answer is no. Take $(y_1,y_2)=(x_1^2,x_1x_2)$. The Jacobian determinant is zero on the line $x_1=0$ but t …
Alexandre Eremenko's user avatar
5 votes

Extensions of Real Analytic to Holomorphic Functions in One & Several Variables: References?

You have to state a specific problem to get a reasonable answer. The proof of the statements you cite is trivial. A function is called analytic at $x_0$ if in some neighborhood of $x_0$ it is represen …
Alexandre Eremenko's user avatar
6 votes
Accepted

Are there such things as non-trivial entire semigroups?

Set $f_t(z)=\phi(t,z)$. Notice that entire functions $z\mapsto f_t(z)$ all commute with each other. I. N. Baker proved that if $f$ is a non-affine entire function with a repelling fixed point then the …
Alexandre Eremenko's user avatar
22 votes

If $f$ is $C^{\infty}$ and $f^2$ is analytic, then $f$ is analytic

Here is a simple proof for complex-analytic case. If restrictions of $f$ on all complex lines are analytic, then $f$ is analytic. This reduces the problem to the case $n=1$. Now $f^2$ is analytic so n …
Alexandre Eremenko's user avatar