Will Brian

Member for 7 years, 11 months
Last seen this week

wrbrian.wordpress.com
Charlotte, NC, United States

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gn.general-topology

574/400 score

70/80 answers

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Answers

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122

Tweetable Mathematics

Apr 26, 2017

66

Bijection from the plane to itself that sends circles to squares

Apr 10, 2017

45

When can one continuously prescribe a unit vector orthogonal to a given orthonormal system?

Nov 5, 2018

42

Which popular games have been studied mathematically?

Jan 9, 2018

40

A topology on $\Bbb R$ where the compact sets are precisely the countable sets

Nov 21, 2016

Questions

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32

Can $[0,1]^4$ be partitioned into copies of $(0,1)^3$?

Aug 26, 2021

30

Is there a subset of the plane that meets every line in two open intervals?

Jul 9, 2015

20

If $S_\mathbb N$ is partitioned into finitely many pieces, must one piece contain a "skew copy" of every countable group?

Sep 2, 2019

14

Is there a countably infinite closed interval in the lattice of topologies?

Jan 12

13

Does van der Waerden's Theorem hold for $\omega_1$?

May 18, 2015

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set-theory

668

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92

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gn.general-topology

577

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78

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lo.logic

164

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15

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real-analysis

134

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14

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cardinal-characteristics

106

Score

17

posts

Reputation

+245

A metric characterization of the real line

+10

Can the cardinal $2^{\aleph_0}$ be order-embedded in ${\cal P}(\omega)/(\text{fin})$?

+10

Can every Borel set be partitioned into $\leq\!\aleph_1$ $F_{\sigma \delta}$ sets?

+10

How do the compact Hausdorff topologies sit in the lattice of all topologies on a set?

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