User Maximilian Janisch

17 votes

3 answers

2k views

When is the number of areas obtained by cutting a circle with $n$ chords a power of $2$?

asked Nov 18, 2019 at 9:28

14 votes

3 answers

2k views

How to prove $e^x\left|\int_x^{x+1}\sin(e^t) \,\mathrm d t\right|\le 1.4$?

asked Mar 10, 2020 at 21:58

14 votes

2 answers

2k views

How many people have the same exact number of hairs?

asked Mar 26, 2021 at 19:39

13 votes

0 answers

1k views

Why am I unable to find primes of the form $(9n)!+n!+1$?

asked Dec 10, 2019 at 0:34

5 votes

1 answer

392 views

Proving equivalence of two definitions of a convex-type Hamming distance

asked Jun 25, 2020 at 11:02

5 votes

1 answer

501 views

How to apply Hahn-Banach to the convex hull?

asked Jun 26, 2020 at 14:25

5 votes

1 answer

804 views

Is the second weak derivative a self-adjoint operator?

asked Aug 14, 2021 at 15:19

5 votes

3 answers

164 views

Reference for a Grünwald–Letnikov-type definition of the $n$-th derivative of a function

asked Apr 30, 2021 at 13:54

4 votes

1 answer

395 views

Decay of solutions to the wave equation $\ddot\phi(t, x)+\frac{n p}{t}\dot\phi(t,x)-t^{-2p}\Delta\phi(t,x)=0$

asked Oct 18, 2021 at 22:45

4 votes

1 answer

481 views

Uniqueness of distributional solutions to the Poisson equation

asked Apr 1, 2021 at 15:42

3 votes

0 answers

467 views

Opposite of the curl operator and Biot-Savart kernel

asked Dec 15, 2020 at 1:00

3 votes

1 answer

542 views

How to rigorously differentiate the convolution of a distribution and a $L^2$ function?

asked Aug 7, 2021 at 18:52

2 votes

1 answer

280 views

Is the parameter-dependent integral of a Sobolev function continuous?

asked Jul 17, 2021 at 10:19

2 votes

1 answer

222 views

Does the inequality $\mu F(\mu)^2\geq \int_{\mu}^{b}F(x)\cdot(1-F(x))\,\mathrm dx$ hold for compactly supported continuous random variables?

asked Oct 22, 2019 at 23:32

2 votes

1 answer

268 views

An oversimplified model for optimal distribution of wealth

asked Aug 5, 2022 at 9:26

2 votes

0 answers

195 views

Asymptotics of $\vartheta(x+y)-\vartheta(x)$, where $\vartheta$ is the Chebyshev function, when $y\in[x^\alpha, x]$ for some $\alpha\in(0,1)$

asked Mar 5 at 20:07

2 votes

1 answer

235 views

Kolmogoroff condition for truncated random variables

asked Apr 23, 2019 at 10:00

1 vote

2 answers

167 views

Number of zeroes and sign switches in a constructed zero-sum double sequence

asked Sep 25, 2019 at 17:20

1 vote

1 answer

428 views

Winning money from random walks?

asked Dec 7, 2020 at 15:23

1 vote

0 answers

205 views

"Potential" for a divergence-free distribution

asked Apr 2, 2021 at 15:41

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20 Questions

When is the number of areas obtained by cutting a circle with $n$ chords a power of $2$?

How to prove $e^x\left|\int_x^{x+1}\sin(e^t) \,\mathrm d t\right|\le 1.4$?

How many people have the same exact number of hairs?

Why am I unable to find primes of the form $(9n)!+n!+1$?

Proving equivalence of two definitions of a convex-type Hamming distance

How to apply Hahn-Banach to the convex hull?

Is the second weak derivative a self-adjoint operator?

Reference for a Grünwald–Letnikov-type definition of the $n$-th derivative of a function

Decay of solutions to the wave equation $\ddot\phi(t, x)+\frac{n p}{t}\dot\phi(t,x)-t^{-2p}\Delta\phi(t,x)=0$

Uniqueness of distributional solutions to the Poisson equation

Opposite of the curl operator and Biot-Savart kernel

How to rigorously differentiate the convolution of a distribution and a $L^2$ function?

Is the parameter-dependent integral of a Sobolev function continuous?

Does the inequality $\mu F(\mu)^2\geq \int_{\mu}^{b}F(x)\cdot(1-F(x))\,\mathrm dx$ hold for compactly supported continuous random variables?

An oversimplified model for optimal distribution of wealth

Asymptotics of $\vartheta(x+y)-\vartheta(x)$, where $\vartheta$ is the Chebyshev function, when $y\in[x^\alpha, x]$ for some $\alpha\in(0,1)$

Kolmogoroff condition for truncated random variables

Number of zeroes and sign switches in a constructed zero-sum double sequence

Winning money from random walks?

"Potential" for a divergence-free distribution