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23 Questions

Votes Activity Newest Views

votes

answers

views

Is the graceful labeling conjecture still unsolved?

trees

Mar 26 '19 at 19:54 djhaskin987 187

votes

answers

155

views

How many solutions are there to $2^a + 3^b = 2^c + 3^d$?

number-theory

Mar 27 '14 at 15:44 naslundx 9,079

votes

answers

493

views

Proving that a set is/is not semilinear

linear-algebra

Apr 11 at 21:51 Bjørn Kjos-Hanssen 2,547

votes

answer

414

views

Density of semiprimes on short intervals

prime-numbers semiprimes

Feb 4 '20 at 2:25 Mathphile 2,287

votes

answers

119

views

Probability of a submatrix with all 1s

probability

May 28 '13 at 23:37 Vor 660

votes

answers

104

views

Has this function a name?

terminology trigonometric-series

Feb 19 '13 at 12:58 joriki 207k

votes

answer

views

Hidden logic self-reference?

logic

Apr 26 '18 at 9:46 Vor 660

votes

answers

187

views

Example of PA model in which Prov(1=0) and 1 != 0?

logic

May 8 '18 at 3:54 Dan Christensen 12k

votes

answer

views

Expressing an equal sized partition in second order logic

logic

May 4 '18 at 17:18 Noah Schweber 190k

votes

answers

views

Double left-right arrow meaning

notation

Oct 28 '17 at 14:44 Natasha 11

votes

answer

views

Logic built on “strings”

reference-request logic

Mar 23 '15 at 17:28 Mauro ALLEGRANZA 83.6k

votes

answers

417

views

Tight bounds on the prime counting function

prime-numbers

May 14 '13 at 16:45 Ian Coley 5,660

vote

answers

651

views

Generalizations of pairing function

functions

May 16 '19 at 22:13 Lars Fabricius-Olsen 1

vote

answer

views

Provability in ZFC + Con(ZFC)

logic

May 3 '18 at 18:35 Noah Schweber 190k

vote

answer

views

Enumeration of points with infinite dimensions

combinatorics

Nov 10 '17 at 18:22 Marie. P. 1,613

vote

answers

320

views

Prime number greater than n

prime-numbers

Aug 22 '16 at 18:20 Oscar Smith 131

vote

answer

views

Paramatric curve that touches all integer $(x,y)$ points of the plane

geometry

Oct 25 '15 at 0:35 Ross Millikan 351k

vote

answers

264

views

Bijective functions over naturals

combinatorics elementary-set-theory

Jun 18 '14 at 11:43 Martin Sleziak 52k

vote

answers

views

Name of the “left” set on which a partial function $f\colon \mathbb N \times \mathbb N \to\mathbb N$ is defined

elementary-set-theory terminology

Mar 29 '14 at 21:38 Git Gud 30.1k

vote

answer

288

views

Math expression for an infinite sequence of primes

prime-numbers

Jun 27 '13 at 18:09 Community♦ 1

votes

answers

views

Graph with distinct automorphisms but no fixed-point free automorphism

graph-theory automorphism-group

Feb 28 '18 at 19:46 Vor 660

votes

answers

views

No primes in $f(n) = n(n+3)/2$ except 2 and 5

number-theory prime-numbers

Jul 11 '16 at 14:06 JukesOnYou 606

votes

answer

views

Notation about factors

notation prime-numbers terminology

May 18 '15 at 11:48 Vor 660

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23 Questions

Is the graceful labeling conjecture still unsolved?

How many solutions are there to $2^a + 3^b = 2^c + 3^d$?

Proving that a set is/is not semilinear

Density of semiprimes on short intervals

Probability of a submatrix with all 1s

Has this function a name?

Hidden logic self-reference?

Example of PA model in which Prov(1=0) and 1 != 0?

Expressing an equal sized partition in second order logic

Double left-right arrow meaning

Logic built on “strings”

Tight bounds on the prime counting function

Generalizations of pairing function

Provability in ZFC + Con(ZFC)

Enumeration of points with infinite dimensions

Prime number greater than n

Paramatric curve that touches all integer $(x,y)$ points of the plane

Bijective functions over naturals

Name of the “left” set on which a partial function $f\colon \mathbb N \times \mathbb N \to\mathbb N$ is defined

Math expression for an infinite sequence of primes

Graph with distinct automorphisms but no fixed-point free automorphism

No primes in $f(n) = n(n+3)/2$ except 2 and 5

Notation about factors