bio  website  cs.smith.edu/~orourke 

location  Smith College, U.S.  
age  
visits  member for  3 years, 11 months 
seen  1 min ago  
stats  profile views  14,122 
Professor of Computer Science; Professor of Mathematics.
5h

revised 
What was the Question that led Euler to his Investigations on Polyhedra?
Joe M.'s quote. 
9h

awarded  Nice Answer 
15h

comment 
Diameter of $n$unitvector closed scribble
@guest: Invented myself, in ignorance of the literature. :) 
15h

revised 
Diameter of $n$unitvector closed scribble
Responding to guest's reasonable query. 
15h

comment 
Diameter of $n$unitvector closed scribble
@guest: Good question! Maybe I should answer directly in the post... 
16h

asked  Diameter of $n$unitvector closed scribble 
17h

comment 
What is the Essential Reason that allows a PTAS for the EUCLIDEAN TSP?
And note that Mitchell independently discovered (about the same time) a PTAS for TSP, based on his guillotine subdivisions: "Guillotine Subdivisions Approximate Polygonal Subdivisions: A Simple PolynomialTime Approximation Scheme for Geometric TSP, kMST, and Related Problems." I cannot myself summarize to what extent his algorithm relies on the Euclidean metric. 
18h

revised 
What was the Question that led Euler to his Investigations on Polyhedra?
Clarified that what I posted is an image, not searchable text. 
21h

revised 
What was the Question that led Euler to his Investigations on Polyhedra?
added 14 characters in body 
21h

comment 
What was the Question that led Euler to his Investigations on Polyhedra?
@TheMaskedAvenger: There is no caption, but, Yes, that is Cauchy. See this bio (link), which includes the same picture. 
22h

answered  What was the Question that led Euler to his Investigations on Polyhedra? 
23h

answered  Is the diameter of a centrally symmetric convex body realized by a pair of antipodal points? 
1d

comment 
What is the best lower bound for 3sunflowers?
Does the $C$ in $A_i \cap A_j = C$ have anything to do with $C_t$? I assume $C$ is a set. Or did you mean $A_i \cap A_j = C$ with $C \in \mathbb{N}$? 
2d

comment 
Is there a sidewayswalking rolling convex body?
@JoelDavidHamkins: Perhaps I should modify the question to require the initial vector of motion to be straight down $y$roughly as in the drawn contact path. This would exclude the cylinder and many other examples. 
2d

comment 
Is there a sidewayswalking rolling convex body?
@JoelDavidHamkins: I meant composed of a uniform material, i.e., not like loaded dice, with one interior portion including more dense material than another interior portion. 
2d

comment 
Is there a sidewayswalking rolling convex body?
@JoelDavidHamkins: I don't see how to alter the question to exclude the cylinder, but that is not what I meant. :) What I sought you found at MoMath. Thanks! 
2d

accepted  Is there a sidewayswalking rolling convex body? 
2d

asked  Is there a sidewayswalking rolling convex body? 
Apr 16 
comment 
Tomography problem involving a set of point masses
For points in $\mathbb{R}^3$, a version of the problem is called "shape from shadows," and is heavily studied. E.g., "The Episolar Constraint: Monocular Shape from Shadow Correspondence" PDF download link 
Apr 15 
accepted  Limit of distance between two random points in a unitradius $n$sphere 