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Kevin P. Costello's user avatar
Kevin P. Costello's user avatar
Kevin P. Costello's user avatar
Kevin P. Costello
  • Member for 15 years, 2 months
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  • Riverside, CA
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About

Currently an Associate Professor of Teaching at UC-Riverside. Interested in Combinatorics, Probability, and especially in their intersection.

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123
If you break a stick at two points chosen uniformly, the probability the three resulting sticks form a triangle is 1/4. Is there a nice proof of this?
Oct 23, 2009
answer
65
Tweetable Mathematics
Apr 26, 2017
answer
32
What's a nice argument that shows the volume of the unit ball in $\mathbb R^n$ approaches 0?
Dec 9, 2009
answer
24
Cauchy-Schwarz and pigeonhole
Oct 15, 2009
answer
23
What are your favorite instructional counterexamples?
Feb 9, 2017
answer
22
The coupon collector's earworm
Aug 28, 2015
answer
18
Splitting Pythagorean triples
Oct 19, 2009
answer
17
Number of invertible {0,1} real matrices?
Mar 18, 2010
answer
13
A strange sum over bipartite graphs
Mar 5, 2012
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12
What are some good examples of non-monotone graph properties?
Sep 28, 2010
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34
Why is the Derangement Probability so Close to $\frac{1}{e}$?
25
List of interesting integrals for early calculus students
18
Picking random points in the volume of sphere with uniform probability
13
Motivation for spectral graph theory.
12
On the invertibility of the adjacency matrix of a graph