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Mathematics
Steve D's user avatar
Steve D's user avatar
Steve D's user avatar
Steve D
  • Member for 9 years
  • Last seen this week
  • Stony Brook, NY
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About

Left math for software, but still like thinking about it.

I used to post a lot on this site; you can still find most of my posts under user641. My favorite.

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Top posts
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answer
13
Which finite group is this?
Oct 30, 2017
answer
12
infinite abelian group where all elements have order 1, 2, or 4
Aug 16, 2017
answer
10
How many nondecreasing functions $f:\{1,2, \ldots, n\} \to \{1,2, \ldots, n\}$ with $f(i)\leq i$ are there?
Aug 21, 2018
question
10
Moving bricks into piles
Oct 26, 2016
answer
10
Find all connected covers of $\mathbb{RP}^2 \vee \mathbb{RP}^2$
Sep 4, 2018
question
9
Interactive web game for the word problem in groups?
Apr 27, 2018
answer
8
Diameter of the Symmetric group
Sep 21, 2018
answer
7
Embedding of 3-manifold $S^3/Q_8$ in $\mathbb R^4$
Sep 9, 2018
answer
7
Generalized Sylow's theorem
Jun 21
answer
6
$(N \times M)/G \to M/G$ is a fibration with fibers $N$
Aug 12, 2018
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90
Can a vector space over an infinite field be a finite union of proper subspaces?
75
Examples of eventual counterexamples
60
Quick proofs of hard theorems
54
Who should win at tug of war?
51
What causes a dog to lunge at an unknown child and how should the owner respond?