Achim's p4

Achim's p4 (or cloverleaf) is a period-4 oscillator that was found in a less compact form (using two sombreros) by David Buckingham in 1976. The form shown here was found by Achim Flammenkamp in 1988.[1] The rotor is two copies of the rotor of 1-2-3-4, so the oscillator is sometimes called the dual 1-2-3-4.

Achim's p4
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 11, y = 9, rule = B3/S23 2b2o3b2o$bo2bobo2bo$bob2ob2obo$2o7b2o$2bobobobo$2o7b2o$bob2ob2obo$bo2b obo2bo$2b2o3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] <nowiki>#C [[ LOOP 4 GPS 2 THUMBSIZE 2 ]]</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 40
Bounding box 11×9
Frequency class 29.0
Period 4
Mod 4
Heat 4
Volatility 0.17
Strict volatility 0.17
Discovered by Achim Flammenkamp
Year of discovery 1988
For other uses of "cloverleaf", see Cloverleaf (disambiguation).

Commonness

Achim's p4 is about the twenty-third most common naturally-occurring oscillator in Achim Flammenkamp's census.[2] On Catagolue, it is the third most common period 4 oscillator, being less common than mazing.[3]

Synthesis

An 8-glider synthesis of this oscillator was found by Jason Summers in September 2004.[4] In October 2010, Lewis Patterson found a predecessor of this oscillator that allows a 7-glider synthesis.[5][6] This was improved to 6 gliders by Chris Cain in March 2015.[7]

The original, less compact form of Achim's p4
gollark: There are no performance implications to this, before you worry.
gollark: Just make all instructions compile to 16 bytes and pad with NOPs.
gollark: They're equal in power to conditional jumps, be.
gollark: A mere optimization.
gollark: Why?

See also

References
  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  3. Adam P. Goucher. "Census". Catagolue. Retrieved on October 27, 2018.
  4. Jason Summers' jslife pattern collection. Retrieved on January 5, 2020.
  5. Lewis Patterson (October 17, 2010). Re: Thread For Your Accidental Discoveries (discussion thread) at the ConwayLife.com forums
  6. Matthias Merzenich (October 17, 2010). Re: Thread For Your Accidental Discoveries (discussion thread) at the ConwayLife.com forums
  7. Chris Cain (March 1, 2015). Re: Thread for your unsure discoveries (discussion thread) at the ConwayLife.com forums
  • 40P4.9 at Heinrich Koenig's Game of Life Object Catalogs
This article is issued from Conwaylife. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.