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323
Answers
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33
Additive Subgroups of the Reals.
Mar 29 '11 at 15:51
32
Do all the roots of the polynomial lie in the unit disk?
Jun 27 '13 at 15:55
31
Do you believe P=NP?
Apr 15 '11 at 17:47
30
A puzzle about finding three points $(x,y)$, $(x,z)$ and $(y,z)$ in a subset of a square.
Feb 25 '11 at 16:36
29
Can ZFC prove it cannot derive an inconsistency in $n$ steps?
Jan 27 '15 at 14:37
25
Countable group with uncountable number of subgroups $< 2^{\aleph_0}$
Jun 17 '15 at 15:17
20
Can we find CH in the analytical hierarchy?
Sep 18 '15 at 17:31
20
Probability, that a graph G does not contain a cycle
Mar 2 '11 at 14:30
19
Special infinitary relations and ultrafilters
Apr 7 '11 at 15:21
18
Even XOR Odd Infinities?
Jan 23 '13 at 14:17
18
The NP version of Matiyasevich's theorem
Jul 20 '11 at 13:46
18
Are there examples of nonconstructive metaproofs?
Jun 8 '11 at 15:58
18
Transcendental numbers: yet another classification
Mar 29 '11 at 15:05
17
The (un)decidability of Robinson-Arithmetic-without-Multiplication?
Jul 25 '14 at 11:36
17
What metatheory proves $\mathsf{ACA}_0$ conservative over PA?
Apr 10 '13 at 12:26
17
Countable Dense Sub-Groups of the Reals…
Jun 8 '11 at 13:47
16
Is factorial definable using a $\Delta_0$ formula?
Feb 25 '15 at 13:05
16
Is the Riemann Hypothesis equivalent to a $\Pi_1$ sentence?
Jun 23 '14 at 10:42
16
Starting PhD at the age of 25
Mar 29 '11 at 18:49
15
Are there “non-constructive” sets in second-order arithmetic?
May 16 '14 at 16:24
15
Morse-Kelley set theory consistency strength
Feb 1 '12 at 16:24
15
Does Fermat's last theorem hold in the ordinals?
Dec 9 '13 at 14:56
15
Sums of binomials with even coefficients
Nov 4 '11 at 16:49
15
More on Lebesgue non-measurability
Aug 3 '11 at 11:12
15
Fast evaluation of polynomials
Jul 4 '11 at 16:09
14
Verifying the correctness of a Sudoku solution
May 6 '13 at 19:12
14
Continued Fractions from Digit Streams
Aug 26 '15 at 11:19
14
Is it easy to produce hard-to-color graphs?
May 30 '14 at 15:48
14
Is there any large cardinal beyond Kunen inconsistency?
Jul 8 '13 at 12:30
14
When does $ZFC \vdash\ ' ZFC \vdash \varphi\ '$ imply $ZFC \vdash \varphi$?
Apr 12 '13 at 10:14
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