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Frode Alfson Bjørdal's user avatar
Frode Alfson Bjørdal's user avatar
Frode Alfson Bjørdal's user avatar
Frode Alfson Bjørdal
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23
Is there a natural bijection from $\mathbb{N}$ to $\mathbb{Q}$?
Mar 21, 2015
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22
"The boat is not longer than it is."
Jul 10, 2021
question
13
Are some interesting mathematical statements minimal?
Apr 21
question
10
What was Gödel's Constitutional Problem? [closed]
Jun 17, 2016
question
9
A question on an ordinal for ZFC-
Jul 31, 2013
question
9
What is the least inaccessible cardinal for Tarski-Grothendieck set theory?
Jan 28
question
8
The Halting Problem and Church's Thesis
Aug 19, 2016
question
7
At what ordinal $\chi$ does $\mathrm{L}_\chi$ contain a surjection from $\omega$ to $\mathrm{L}_{\beta_0}$?
Jul 18
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6
When do we get $CON(ZF)$ in transfinite progressions of consistency statements?
Mar 8, 2017
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Does $WKL_0$ provide more comprehension than $RCA_0$?
Oct 5, 2015
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How may I rotate a tikzpicture?
24
How can I get the Russian ruble sign?
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How do I add \begin{definition} … \end{definition}?
12
How do I get filled black < and \leq?
11
How is the Scimago journal ranking (Q1-Q4) defined?