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33 votes

10 answers

3k views

What's the closest approximation to $\pi$ using the digits $0-9$ only once?

asked Jan 3, 2018 at 23:08

12 votes

5 answers

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Must a sequence be well-founded?

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11 votes

0 answers

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Write Occam's razor rigorously

asked Jul 28, 2017 at 10:52

9 votes

3 answers

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What's $-\frac{1}{27}$ in the p-adic ring $\Bbb Z_2$? [duplicate]

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7 votes

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Show $f(x)=1-\frac{1}{x\left(\lvert x\rvert_2\right)}$ converges on $0$ in finite steps

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6 votes

1 answer

1k views

What are the higher dimensional analogues of left and right handedness?

asked Aug 7, 2016 at 8:32

6 votes

1 answer

480 views

Would Brun's constant being transcendental prove the twin prime conjecture?

asked Aug 26, 2016 at 14:06

6 votes

6 answers

1k views

How do I resolve this paradox of counting line segments?

asked Mar 31, 2017 at 11:29

5 votes

2 answers

453 views

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5 votes

4 answers

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5 votes

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Zorn's Lemma - partial order, or preorder? [duplicate]

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4 votes

2 answers

684 views

How is the concept of $\Bbb Z/2\Bbb Z$ extended to $\Bbb N/2\Bbb N$? Is $\Bbb N/2\Bbb N$ ambiguous?

asked Nov 29, 2019 at 10:30

4 votes

1 answer

464 views

How do p-adic fields degenerate for non-prime $p$?

asked Jun 3, 2019 at 8:26

4 votes

1 answer

379 views

Does some Lucas sequence contain infinitely many primes?

asked Nov 3, 2018 at 18:21

4 votes

3 answers

529 views

How might we approach Collatz Conjecture by probabilistic method?

asked Sep 10, 2017 at 18:47

4 votes

3 answers

321 views

What is a generating function?

asked Jul 19, 2017 at 17:45

4 votes

1 answer

1k views

When is a function a permutation of the integers?

asked Jul 6, 2017 at 8:03

4 votes

0 answers

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What triangles do the $p-$adic numbers generate?

asked Apr 27, 2017 at 19:44

3 votes

2 answers

788 views

How do I show convergence in the 2-adics?

asked Jul 7, 2017 at 10:00

3 votes

3 answers

64 views

Is it appropriate to use $\lim$ for a finite sum?

asked Jul 11, 2017 at 16:54

3 votes

1 answer

152 views

Are there meaningful statements about the numbers which cannot be proved with Peano+(independence from Peano)

asked Mar 17, 2017 at 15:51

3 votes

1 answer

324 views

What do we call the restriction of some function to a certain domain?

asked Apr 13, 2017 at 12:36

3 votes

1 answer

142 views

Is it possible to choose uniformly from $(0,1)$?

asked Apr 20, 2017 at 8:27

3 votes

3 answers

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What's the boundary of a sequence of integers?

asked Aug 2, 2017 at 13:06

3 votes

2 answers

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For which $\mathbb{Z}_2$ is the logarithm defined?

asked Jan 8, 2018 at 20:35

3 votes

1 answer

263 views

Does every sequence $4^nx_0+\frac{4^n-1}{3}$ contain a prime?

asked Mar 23, 2018 at 23:01

3 votes

1 answer

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How symmetric is the hierarchy of indecomposable ordinals?

asked Jun 15, 2018 at 9:19

3 votes

1 answer

454 views

What's the sum of the inverses of the Primorial numbers?

asked Jun 22, 2018 at 11:55

3 votes

2 answers

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Show that $3^{-n}$ have the interesting property that one half of their repeating binary string is the inverse of the other.

asked Oct 24, 2019 at 19:08

3 votes

1 answer

143 views

What are the topological properties of the Cantor set if a point is added at the center of every missing segment?

asked Jan 1, 2020 at 22:20

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338 Questions

What's the closest approximation to $\pi$ using the digits $0-9$ only once?

Must a sequence be well-founded?

Write Occam's razor rigorously

What's $-\frac{1}{27}$ in the p-adic ring $\Bbb Z_2$? [duplicate]

Show $f(x)=1-\frac{1}{x\left(\lvert x\rvert_2\right)}$ converges on $0$ in finite steps

What are the higher dimensional analogues of left and right handedness?

Would Brun's constant being transcendental prove the twin prime conjecture?

How do I resolve this paradox of counting line segments?

How can the Zeta function be zero?

What's the smallest difference in a group?

Zorn's Lemma - partial order, or preorder? [duplicate]

How is the concept of $\Bbb Z/2\Bbb Z$ extended to $\Bbb N/2\Bbb N$? Is $\Bbb N/2\Bbb N$ ambiguous?

How do p-adic fields degenerate for non-prime $p$?

Does some Lucas sequence contain infinitely many primes?

How might we approach Collatz Conjecture by probabilistic method?

What is a generating function?

When is a function a permutation of the integers?

What triangles do the $p-$adic numbers generate?

How do I show convergence in the 2-adics?

Is it appropriate to use $\lim$ for a finite sum?

Are there meaningful statements about the numbers which cannot be proved with Peano+(independence from Peano)

What do we call the restriction of some function to a certain domain?

Is it possible to choose uniformly from $(0,1)$?

What's the boundary of a sequence of integers?

For which $\mathbb{Z}_2$ is the logarithm defined?

Does every sequence $4^nx_0+\frac{4^n-1}{3}$ contain a prime?

How symmetric is the hierarchy of indecomposable ordinals?

What's the sum of the inverses of the Primorial numbers?

Show that $3^{-n}$ have the interesting property that one half of their repeating binary string is the inverse of the other.

What are the topological properties of the Cantor set if a point is added at the center of every missing segment?