145P20

145P20 is an unnamed period-20 oscillator. It was the first non-trivial period 20 oscillator to be found,[note 1] and was discovered by Noam Elkies on March 22, 1995.[1]

145P20
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html> x = 28, y = 21, rule = b3/s23 4b2o4bo4b2o11b$3bo2bobo3bobo2bo10b$3b3o9b3o10b$b2o3b2o5b2o13b$obo2bo2b 5o2bo4b2o6b$obobobo7b2o3bo2bo5b$bobobo13bobo2bo2bo$3bo14b2obob5o$2bo2b o11bo3bo6b$2bo9bo4bo4bob2o2b$2bo3bo3b2ob2o2bo3b2o3bob$2bo9bo4bo4bobobo b$2bo2bo11bo3bo3bo2b$3bo14b2obob2o3b$bobobo13bobobo4b$obobobo7b2o3bobo 2bo3b$obo2bo2b5o2bo4bo2b2o3b$b2o3b2o5b2o13b$3b3o9b3o10b$3bo2bobo3bobo 2bo10b$4b2o4bo4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] <nowiki>#C [[ GPS 4 LOOP 20 THUMBSIZE 2 ZOOM 10 ]]</nowiki> <html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html> <html></noscript></canvas></div></html>
View animated image
View static image
Pattern type Oscillator
Number of cells 145
Bounding box 28×21
Period 20
Mod 20
Heat 72.8
Volatility 0.60
Strict volatility 0.18
Discovered by Noam Elkies
Year of discovery 1995

It works by using sparks from three period 4 middleweight emulators and the period 5 middleweight volcano to hassle a traffic light predecessor. The middleweight emulator on the left can be replaced with a middleweight volcano.

Notes
  1. A period-20 oscillator, heavyweight emulator on octagon II, can be constructed from two sparkers (heavyweight emulator and octagon II) both of which were known by 1980. However, this type of oscillator is generally considered "boring", and thus not counted despite technically being non-trivial.
gollark: Also, to understand the statement of the principle itself it would be helpful if you knew what standard deviations were, which I assume you do not.
gollark: To actually understand why it exists, I believe you need maths to something something wavefunctions.
gollark: Yes.
gollark: Wikipedia has this nice statement of it, which is obviously true because Wikipedia says it.
gollark: It's not that one is "not defined", or that you can determine one but not the other, but that if you measure it you must trade off accuracy in one for the other.

References
  1. Dean Hickerson's oscillator stamp collection.
This article is issued from Conwaylife. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.