6,800 reputation
12882
bio website sas.upenn.edu/~vnanda
location Philadelphia, PA
age
visits member for 3 years, 8 months
seen 13 mins ago

Currently a post-doc at Penn, was a graduate student at Rutgers. Here are some papers, some software, and a seminar.


20h
comment Contractibility of regular CW sphere minus open star
@TylerLawson Or you could use the minimal CW circle that glues the boundary of an interval to a single vertex. Then the open star of that vertex is everything and its complement is therefore empty.
21h
awarded  Good Question
23h
revised Contractibility of regular CW sphere minus open star
added 180 characters in body
1d
asked Contractibility of regular CW sphere minus open star
May
26
comment How hard is it to destroy a diamond? (with a real)
I've upvoted in order to partially offset the inevitable backlash from environmentalists who react negatively to "blow up the continuum and destroy all the Suslin trees."
May
15
comment Generalize $\pi_0(B\mathcal{C})\cong\{\text{objects}\}/\{\text{morphisms}\}$ to categories internal to topological spaces
How exactly is the quotient (objects)/(morphisms) being defined? Do you mean to indicate that two objects $x$ and $y$ are equivalent if there exists $f:x \to y$? Or maybe $f:y \to x$? Or either?
May
10
comment Bunnity of multilinear maps
You should offer a bounty to whoever manages to frame the answer in terms of Wascal's triangle.
May
7
comment Is the space of immersions of $S^n$ into $\mathbb R^{n+1}$ simply connected?
@QiaochuYuan If it helps, I suspect Ryan's comment lies in the space of unbased critiques from Professors to Grad Students.
May
7
comment Graph of graph homomorphisms
@EricWofsey What does the box in "$G$ box $H$" mean?
May
4
comment Who introduced the concept of topological mixing?
The definition is due to Adler, Konheim and McAndrew from 1965. You can find this and more on wikipedia. Their work was motivated by Rohlin's 1959 paper which contains the definition for metric spaces (V. A. Rohlin, Entropy of metric automorphism, Dokl. Akad. Nauk SSSR124(1959), 980-983.)
May
4
revised Who introduced the concept of topological mixing?
Added history overview
May
1
revised Graph of graph homomorphisms
OP altered question to specifically preclude this answer
May
1
answered Graph of graph homomorphisms
Apr
30
revised Finite-space dynamical systems
added indefinite article
Apr
30
answered Finite-space dynamical systems
Apr
28
comment Poset-enrichment of abelian categories
Thanks for the wonderful answer, Eric!
Apr
28
comment Poset-enrichment of abelian categories
Thanks, Qiaochu! This is exactly what I was looking for!
Apr
28
accepted Poset-enrichment of abelian categories
Apr
28
comment Poset-enrichment of abelian categories
Hmmm, a preorder would be fine!
Apr
28
comment Poset-enrichment of abelian categories
@QiaochuYuan no, there's isn't.