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Dark Malthorp
Everything has a closed form for a sufficiently broad definition of "closed form".
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Top Questions
17
votes
If $r\in\mathbb{Q}\setminus\mathbb{Z}$ is it possible that $r^{r^{r^r}}\in \mathbb{Q}$?
reference-request
exponentiation
irrational-numbers
tetration
asked May 2, 2020 at 16:25
math.stackexchange.com
10
votes
Find radius of convergence for a complicated series for $f'(f(x)) = f(f'(x))$
sequences-and-series
complex-analysis
power-series
taylor-expansion
functional-equations
asked Jan 20, 2020 at 19:29
math.stackexchange.com
9
votes
Given $f(z)$ can you find $g(z)$ such that $g(z+1) = f(z) + g(z)$
complex-analysis
functional-equations
asked Jun 17, 2018 at 16:19
math.stackexchange.com
8
votes
Evaluate $\lim\limits_{n\rightarrow\infty} \mathrm{srt}_n\left({^{n+1}}2\right)$
sequences-and-series
limits
approximation
tetration
asked Feb 13, 2020 at 17:49
math.stackexchange.com
8
votes
$f(z) = z + f(z^2)$ outside the unit disk?
complex-analysis
power-series
functional-equations
analytic-functions
analytic-continuation
asked Feb 28, 2020 at 16:30
math.stackexchange.com
6
votes
Constructing analytic solutions to the delay differential equation $f'(x) = x f(x-1) - f(x)$
real-analysis
integration
delay-differential-equations
asked Jan 10, 2020 at 23:53
math.stackexchange.com
5
votes
Real, analytic exponential factorial $f(x) = x^{f(x-1)}$
real-analysis
complex-analysis
functional-equations
analytic-functions
asked Jan 21, 2020 at 18:25
math.stackexchange.com
5
votes
Why are two-winged animals much more common than four-winged?
zoology
entomology
ornithology
flight
asked Apr 11, 2020 at 23:18
biology.stackexchange.com
5
votes
Which came first? Chinese 蘑菇 or Mongolian мөөг?
etymology
loanwords
asked Feb 16, 2021 at 0:59
chinese.stackexchange.com
5
votes
Does anyone know a simple proof of $\lim_{x\rightarrow\infty} x\int_0^1 t^{x t} dt = 1$
integration
limits
asked Jun 15, 2018 at 22:55
math.stackexchange.com
Top Answers
19
Is it impossible to perfectly fit a polynomial to a trigonometric function on a closed interval?
math.stackexchange.com
13
Making π from 1 2 3 4 5 6 7 8 9
puzzling.stackexchange.com
10
Proof of solutions to “24” operations game
math.stackexchange.com
10
"What does it sound like" vs "How does it sound like"
ell.stackexchange.com
8
How do I stop Megalodon from going extinct?
worldbuilding.stackexchange.com
8
Calculate $\int_{0}^{3}\sqrt{4-x^2}\,dx$ using a Riemann sum
math.stackexchange.com
7
Differentiable functions satisfying $f'(f(x))=f(f'(x))$
math.stackexchange.com
6
In how many different ways can you prove that $\sin^2x + \cos^2x = 1$
math.stackexchange.com
6
Moving away from Christian faith: how to retain relationships?
interpersonal.stackexchange.com
5
Taylor series for tetration
math.stackexchange.com
5
Determine the limit of the integral $\lim_{n\to \infty}\int_0^1nx^nf(x)\,dx$
math.stackexchange.com
5
Expression for the value of $\int_0^1 x^{1/x}dx$
math.stackexchange.com
5
"$\mathbb{R}^2$ can't be totally ordered" (nicely)
math.stackexchange.com
5
How to prove the sequence $\{a_n\}$ is unbounded, which satisfies the recurrence relation $a_{n+1}=\ln |a_n|$?
math.stackexchange.com
5
Mass extinction because of too low CO2-levels
worldbuilding.stackexchange.com
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