23,635 reputation
266127
bio website math.purdue.edu/~eremenko
location United States
age 60
visits member for 2 years, 5 months
seen 4 hours ago
Math Professor

2d
awarded  differential-equations
2d
answered Sequence of smooth maps converging to the identity
Jan
23
answered Local rotations to world rotations
Jan
19
answered What would undergraduate research consist of?
Jan
19
comment Does Newtonian capacity increase strictly when mass is spread?
@TKM: I agree with Christian's last message. The measure cannot be supported by A or B because you said that they are both of positive capacity.
Jan
18
comment Does Newtonian capacity increase strictly when mass is spread?
I did not understand how do you use the Landkof result. Why does there exist a contraction which sends $A$ to $A$ and $B$ to $B+rv$? (I do not think this is true without further restrictions.) And what does your strange sign like $\Pi$ upside down nean? Is this the union?
Jan
18
answered What are Carnot groups?
Jan
12
comment Analytic diffeomorphisms of the circle from complex domains
MR0902292 Kirillov, A. A. Kähler structure on the K-orbits of a group of diffeomorphisms of the circle.
Jan
12
answered Simple Spectrum of Jacobi matrices
Jan
11
awarded  Nice Answer
Jan
6
awarded  Good Answer
Jan
5
comment MathScinet reviewing: should I check the proofs?
@Adam Epstein: It is nobody's responsibility:-) When you use some published result, it is only YOUR responsibility to check that it is correct.
Jan
5
awarded  Nice Answer
Jan
5
comment Research and exposition: how does writing “basic” books affect your “serious” research work?
Young mathematicians usually do not write basic textbooks, though there are few exceptions. Assuming that you are a young mathematician, I do not understand why are you asking this question.
Jan
5
answered MathScinet reviewing: should I check the proofs?
Jan
5
awarded  Good Question
Jan
2
comment Are there any serious investigations of whether “mathematicians do their best work when they're young”?
I see nothing wrong with this question: it is a legitimate "reference request" on the question which is of interest to many. I vote to re-open.
Dec
30
reviewed Close Set of critical values is compact
Dec
30
reviewed Leave Open Shortest rope to capture a sphere of diameter 1
Dec
30
reviewed Close The functional $L(\varphi)=\int_0^{2\pi}\frac{\sqrt{1-\varphi^2-(\varphi')^2}}{1-\varphi^2}d\theta$