Fore and back

Fore and back (or complementary blinker[1]) is a period-2 oscillator that was found by Achim Flammenkamp on July 12, 1994.[2] Its rotor is the same as the blinker.

Fore and back
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>2ob2o2b$2obobob$6bo$3ob3o$o6b$bobob2o$2b2ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] <nowiki>#C [[ 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
Oscillator type Billiard table
Number of cells 24
Bounding box 7×7
Frequency class 30.6
Period 2
Mod 1
Heat 4
Volatility 0.15
Strict volatility 0.15
Rotor type Pole 2
Discovered by Achim Flammenkamp
Year of discovery 1994

Commonness

Fore and back is about the thirty-eighth most common naturally-occurring oscillator in Achim Flammenkamp's census, being less common than boat on spark coil and block on griddle, about as common as 21P2, and more common than trans-block on long hook eating tub and trans-beacon down on long hook.[3] It is the most common oscillator that is generally agreed to be a billiard table, though some instead give this title to the more common test tube baby, which counts under a looser definition.[4]

Synthesis

In August 2013, a 24-glider synthesis of this oscillator was found by Martin Grant, based on a soup provided by Lewis Patterson. Several days later Mark Niemiec improved this result, having found a 20-glider synthesis.[5]

In October 2014, Tanner Jacobi found a predecessor for this pattern based on a soup from Adam P. Goucher's apgsearch script,[6] which was eventually optimized to a 6-glider synthesis[7] in November.

gollark: There aren't any.
gollark: Oh, they hacked into all bots to track you across servers.
gollark: I suspect they were affected by a metacognitohazard causing nonbelief in cognitohazards.
gollark: Yes. These facts are uncited and not deifically verified.
gollark: ++magic reload_ext irc_link

See also

References
  1. "Complementary blinker". The Life Lexicon. Stephen Silver. Retrieved on December 3, 2018.
  2. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  3. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  4. Dave Greene (July 3, 2019). Re: Thread for basic questions (discussion thread) at the ConwayLife.com forums
  5. Lewis Patterson (August 4, 2013). "Synthesising Oscillators". Retrieved on September 10, 2013.
  6. Tanner Jacobi (October 15, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  7. Tanner Jacobi (November 8, 2014). "Soup search results". Retrieved on November 9, 2014.
  • 24P2.142 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.