This one by Ramanujan gives me the goosebumps:
$$
\frac{2\sqrt{2}}{9801} \sum_{k=0}^\infty \frac{ (4k)! (1103+26390k) }{ (k!)^4 396^{4k} } = \frac1{\pi}.
$$
P.S. Just to make this more intriguing, define the fundamental unit $U_{29} = \frac{5+\sqrt{29}}{2}$ and fundamental solutions to Pell e...
0
I noticed earlier today that the Befunge interpreter on TIO no longer functioned in quite the same way as the old version (I guess this was caused by the nexus update). As a result, one of my old answers that relied on undefined behaviour that was specific to the TIO implementation is now no long...
Iteratino over vectors in matrices.
Given a set of vector as matrix, you can actually iterate over them via a single for loop like
for v=M
disp(v);
end
while "traditionally" you probably would have done it like
for k=1:n
disp(M(:,k));
end
I've only learned about this trick just now...
Willard Van Orman Quine (/kwaɪn/; June 25, 1908 – December 25, 2000) (known to intimates as "Van") was an American philosopher and logician in the analytic tradition, recognized as "one of the most influential philosophers of the twentieth century." From 1930 until his death 70 years later, Quine was continually affiliated with Harvard University in one way or another, first as a student, then as a professor of philosophy and a teacher of logic and set theory, and finally as a professor emeritus who published or revised several books in retirement. He filled the Edgar Pierce Chair of Philosophy...
27
Create an equation who's only solution is the numerical ASCII code of the equation itself code-golf quine
Your equation will be run as a Wolfram Alpha query with Solve prepended to it.
The equation must start with (spaces optional):
y =
f(x)
g(x)
h(x)
Output is considered to be the string i...
(2048)^2 kolmogorov-complexity code-challenge code-golf
We've had different kinds of challenges based the classic tic-tac-toe game.
One such challenge was to represent a full tic-tac-toe game as efficiently as possible.
And now, you're going to do it for the popular game 2048, among other thin...
The Biham-Middleton-Levine traffic model is a self-organizing cellular automaton that models simplified traffic.
It consists of a number of cars represented by points on a lattice with a random starting position, where each car may be one of two types: those that only move downwards (shown a...
PATH is an environment variable on Unix-like operating systems, DOS, OS/2, and Microsoft Windows, specifying a set of directories where executable programs are located. In general, each executing process or user session has its own PATH setting.
== History ==
Multics originated the idea of a search path. The early Unix shell only looked for program names in /bin, but by Version 3 Unix the directory was too large and /usr/bin, and a search path, became part of the operating system.
== Unix and Unix-like ==
On POSIX and Unix-like operating systems, the $PATH variable is specified as a list of one...
Golf a Sound Change Applier
(Snappier title suggestions appreciated)
code-golf interpreter parsing
Background
The pronunciation of human languages changes over time. Often, sound changes follow discernable rules, with the same change applied consistently across many words in a language. For...
Given a rectangular grid of text, line up the diagonals that go from the upper-left to the bottom-right into columns such that the lowest-rightmost characters of all diagonals are on a level. Use spaces for indentation.
For example, if the input grid of text is
abcd
1234
WXYZ
then you'd line ...
The Futuristic Gun Duel king-of-the-hill
Background
In the year 2017, two players face each other off in a futuristic gun battle where only one player may survive. Are you experienced enough to defeat your opponent?
Rules
The rules of the gun duel are as follows:
Each player owns an u...
