tim_hutton
Joined 14 years ago
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1,220
Submissions
122
Member since
Feb 20
https://github.com/timhutton
https://mathstodon.xyz/@timhutton
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Comment · 2 years ago
Two orbital things we might look for:
1. Activity in geostationary orbits.
2. Orbits where the planet's year is exactly divisible by its day, eliminating leap years.
Comment · 3 years ago
Fredkin’s Self-Replicating Cellular Automata:
Sum the neighbors, modulo 2, and assign to the cell on the next timestep.
Astonishingly this allows patterns to replicate in multiple directions across the plane. https://cellpylib.org/fredkin.html
Works with any kind of lattice. Even works in 3D.
Comment · 3 years ago
"According to biographer Robert Wright, the character Stephen Falken in the film WarGames was modeled after Fredkin." [https://en.wikipedia.org/wiki/Edward_Fredkin]
Comment · 3 years ago
Did you know, cats are believed to be the only mammals that don't taste sweetness! To unsubscribe at any time, reply STOP to this message.
Comment · 3 years ago
Sandy Crush
Comment · 3 years ago
The only was I can remember which is port and starboard is by thinking about boarding an airplane. The steps/tunnel are always docked on the 'port' side, just as boats always dock on the port side. The cockpit/bow is always on your left when you board.
Comment · 3 years ago
Not hidden in the knitting in the sense of the specific stitches (which is also very cool: https://www.popsci.com/story/diy/secret-code-messages-knitti...) but it seems she needed the knitting needle to insert the one-time codes (on a piece of silk) into a shoelace. Amazing story.
Comment · 3 years ago
One route to understanding how CPUs work is to explore the computers that have been made in cellular automata. Golly (https://golly.sourceforge.net/) has several, including one by John von Neumann, one by Edgar Codd and another by John Devore. The advantage of course is that the physics is trivial and you can see everything that happens and step backwards and forwards.
Example:
https://timhutton.github.io/2010/03/10/30984.html
https://github.com/GollyGang/ruletablerepository/wiki/CoddsD...
Comment · 3 years ago
I'm very skeptical of hydrogen as a general solution for reducing carbon emissions. It feels like greenwashing.
"As of 2020, the majority of hydrogen (∼95%) is produced from fossil fuels" https://en.wikipedia.org/wiki/Hydrogen_production
Producing "green hydrogen" is much more expensive: https://en.wikipedia.org/wiki/Green_hydrogen
Comment · 4 years ago
If this is true then Haskell's type system is Noether's Theorem.
Comment · 4 years ago
This is an excellent app, it works very well. Thanks for linking.
Comment · 4 years ago
> "02016"
Thank you for preparing for the Y10K problem.
Comment · 4 years ago
I need this for my Android phone to compensate for a burnt-in image.
Comment · 4 years ago
"the sensation they are experiencing is not being cancelled but merely going out of fashion" - https://www.theguardian.com/commentisfree/2022/aug/14/terry-...
Comment · 4 years ago
As a Golly file, so you can run it for yourself: https://github.com/GollyGang/ruletablerepository/raw/gh-page... (4kB)
In Golly: File > Open Pattern... > open the zip itself (don't unzip first).