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In mathematics, Richardson's theorem establishes the undecidability of the equality of real numbers defined by expressions involving integers, π,
ln
2
,
{\displaystyle \ln 2,}
and exponential and sine functions. It was proved in 1968 by mathematician and computer scientist Daniel Richardson of the University of Bath.
Specifically, the class of expressions for which the theorem holds is that generated by rational numbers, the number π, the number ln 2, the variable x, the operations of addition, subtraction, multiplication,...
Minimum rotation to get the maximum value
I recently solved a coding challenge in one of challenge papers that my IT teacher gave to us. It was a seemingly simple, but fun challenge, so I thought it will make fun golfing.
The task
Given an input of a 2x2 matrix, like this:
a
b
c
d
We ...
I was writing a questions about keyboard shortcuts when I stumbled across the shortcut tag. It's currently described as:
A route more direct than the one ordinarily taken.
A method or means of doing something more directly and quickly than and often not so thoroughly as by ordinary procedure.
T...
Introduction:
Some times using a 24-hour clock are formatted in a nice pattern. For these patterns, we'll have four different categories:
All the same (pattern AA:AA or A:AA):
0:00
1:11
2:22
3:33
4:44
5:55
11:11
22:22
Increasing (pattern AB:CD or B:CD, where D==C+1==B+2==A+3):
0:12
1:23...
Create a DialFrost simulator code-golfrandom
inspired by this message asked in chat
DialFrost simulator upgraded: to an input, append or prepend (50% chance of each) ":3"
NOTE: no offense to DialFrost, just posted this because I personally found his trademark funny.
So basically, your task is...
Yesterday, I stumbled on a very clever thing.
Yes, that's a working implementation of Tic-Tac-Toe on a user profile page, from @minitech. Of course, the moment I saw it, I had to reverse engineer his idea and one-up him :P
Here's my own example embedded directly in the post. It's a tad buggy ...-58
Using built-in functions to do the work
Mathematica is a big one for this, with Fibonacci[n] to calculate the n'th Fibonacci number.... I have no objection to these being posted as a side note within the main answer though - that is interesting and helps me learn different languages capabilities...
The following solution uses my own custom domain-specific programming language which I have called NULL:
3499538
In case you are wondering how this works: My language consists of only of one statment per program. The statement represents a StackOverflow thread ID belonging to a code golf thre...
One of the classic patterns
***
..*
.*
My avatar was created using my version of the Game of Life using this pattern and rule(note that it is not 23/3):
#D Thanks to my daughter Natalie
#D Try at cell size of 1
#R 8/1
#P -29 -29
.*********************************************************
*.***...
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