bio | website | math.psu.edu/petrunin |
---|---|---|
location | Penn State | |
age | 46 | |
visits | member for | 4 years, 9 months |
seen | yesterday | |
stats | profile views | 10,458 |
From my son's writing:
Mein Vater hat keine Haare aber er hat einen schwarzen Bart. Er hat grüne Augen so wie ich. Er benutzt seine Brille sehr selten. Sein Name ist Tosha. Er mag Musik spielen aber ist ganz schlecht dabei und ist 44 Jahre alt.
Aug 16 |
awarded | Nice Question |
Aug 9 |
comment |
Roadmap to learning about Ricci Flow?
The curvature evolution equation was not fully developed in 1982 and it simplifies presentation quite a bit. "Manifolds with positive curvature operators are space forms" by Boehm and Wilking is more readable and more general. |
Jul 19 |
answered | Point of maximal distance on a non-positively curved PL surface |
Jul 2 |
awarded | Inquisitive |
Jul 2 |
awarded | Curious |
Jun 29 |
comment |
A geometric characterization of smooth points of a complex algebraic variety
Note that your $X$ is minimal. Therefore, by monotonicity formula, your limit exists and it has to be $\ge 1$. |
Jun 11 |
answered | The set of strained points in an Alexandrov space is open |
Jun 6 |
answered | Volume of a polytope with relaxed constraints |
May 26 |
answered | Metric density theorem in most general setting? |
May 22 |
awarded | Nice Answer |
Apr 21 |
comment |
Are the higher homotopy groups of the Hawaiian earring trivial?
Nice argument; so you claim that in general planar continua (i.e., not for Hawaiian earring) there is a gap; can you fix it? |
Apr 20 |
awarded | Nice Answer |
Apr 20 |
answered | Are the higher homotopy groups of the Hawaiian earring trivial? |
Apr 19 |
comment |
Dimension of a set detected by a homology class
@IgorBelegradek, All this follows directly from the construction. |
Apr 19 |
comment |
Dimension of a set detected by a homology class
@IgorBelegradek, I think all this standard, isn't it? I only wanted to indicate the construction. |
Apr 19 |
revised |
Dimension of a set detected by a homology class
+pic |
Apr 18 |
answered | Dimension of a set detected by a homology class |
Apr 18 |
comment |
Length inequalities in trees and CAT(0) spaces
Close, but not the same. We ment something like that: mathoverflow.net/questions/7794/ (you will not need the consition on rank. For Lobachevsky space or sphere you need to use hyperbolic/spherical cosine rule instead.) |
Apr 18 |
reviewed | Approve suggested edit on Projective modules over noncommutative tori? |
Apr 18 |
reviewed | Approve suggested edit on Drinfeld's noncommutative projective line and noncommutative geometry |