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Oscar Cunningham's user avatar
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Oscar Cunningham
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Top posts
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question
95
Can a row of five equilateral triangles tile a big equilateral triangle?
Apr 13, 2017
question
38
Could groups be used instead of sets as a foundation of mathematics?
Feb 9, 2020
question
34
Does "every" first-order theory have a finitely axiomatizable conservative extension?
Mar 27, 2019
answer
30
Decision problems for which it is unknown whether they are decidable
Nov 6, 2019
question
24
Is there a 'certainty' principle?
Aug 29, 2020
answer
22
Results true in a dimension and false for higher dimensions
Sep 17, 2014
answer
21
Nuances Regarding Naturality
Jul 11, 2016
question
19
Has this "backwards" perspective on toposes been studied?
Sep 25, 2019
answer
17
How can one construct a four-coloring of a tiling of the plane with Smith, Myers, Kaplan, and Goodman-Strauss's aperiodic monotile?
Mar 25, 2023
question
16
Is there a universal way to force the Axiom of Choice to be true?
Mar 22, 2018
Top network posts
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154
Simple theorems that are instances of deep mathematics
93
Collection of surprising identities and equations.
91
Can a row of five equilateral triangles tile a big equilateral triangle?
88
Why isn't Tyrion mentioned in the in-universe book "A Song of Ice and Fire"?
71
Nice expression for minimum of three variables?