16,860 reputation
352136
bio website math.psu.edu/petrunin
location Penn State
age 46
visits member for 4 years, 8 months
seen Jul 19 at 22:48

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.


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
Apr
18
answered Length inequalities in trees and CAT(0) spaces
Apr
1
comment A question on the curvature of smooth and embedded curves in a plane
No, check the picture in this question: mathoverflow.net/questions/126128/…