Burloaferimeter

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Burloaferimeter
4b2o4b$5bo4b$4bo5b$3bob3o2b$3bobo2bob$2obo3bobo$2obo4bob$4b4o2b2$4b2o 4b$4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 32 GPS 3 HEIGHT 480 WIDTH 480 ]]
Pattern type Oscillator
Oscillator type Billiard table
Number of cells 28
Bounding box 10×11
Period 7
Mod 7
Heat 1.4
Volatility 0.16
Strict volatility 0.16
Discovered by David Buckingham
Year of discovery 1972

Burloaferimeter is a period-7 oscillator that was found by David Buckingham in 1972.[1][2] In terms of its 28 cells, it is tied with the three unnamed oscillators 28P7.1, 28P7.2, and 28P7.3 as the smallest known period 7 oscillator.[3] In terms of bounding box, the outright winner is an 11×9 burloaferimeter stator variant.[4] It is the only known oscillator with a heat below 2.[5]

Etymology

According to Mark D. Niemiec[6], a loaf was called a Bread Loaf by his group, which then was abbreviated to Br'loaf, then became burloaf. "Burloaf" has a population of 7, which "measures" burloaferimeter's period.

Variants

x = 16, y = 16, rule = B3/S23 6bo2bo6b$6b4o6b$16b$4b8o4b$3bo8bo3b$3bo3b3o2bo3b$2obobo2bo3bob2o$bobob 2o3bobobob$bobobo3b2obobob$2obo3bo2bobob2o$3bo2b3o3bo3b$3bo8bo3b$4b8o4b$ 16b$6b4o6b$6bo2bo6b! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]]
C4_4-symmetric quadruple burloaferimeter variant
found by Park Shinhwan on Catagolue in November 2016.[7]
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagoluehere
x = 16, y = 16, rule = B3/S23 6b2o2b2o4b$6b2o2b2o4b$16b$4b8o4b$2obo8bo3b$2obo3b3o2bo3b$3bobobo4bob2o$ 3bobo3b2obob2o$2obob2o3bobo3b$2obo4bobobo3b$3bo2b3o3bob2o$3bo8bob2o$4b 8o4b$16b$4b2o2b2o6b$4b2o2b2o6b! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]]
C4_4-symmetric quadruple burloaferimeter variant
found by Apple Bottom on Catagolue on June 16 2017.[8]
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagoluehere

A 28-glider synthesis for the first variant was discovered by Luka Okanishi shortly after,[9] and was improved to 24 gliders by Jeremy Tan on January 5, 2020.[10]

On September 27, 2020, a burloaferimeter stator variant appeared in an asymmetric soup found by Rob Liston, becoming the first period-7 oscillator to occur naturally.[11] A 12-glider synthesis based on this soup was found soon afterwards due to contributions by various users on Discord.[12] A second burloaferimeter variant occurred on January 9, 2021, in a soup found by Adam P. Goucher.[13] Many stator variants have been found since, mostly by Charity Engine.

See also

References

  1. Robert Wainwright (October 1972). Lifeline, vol 6, page 3.
  2. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  3. "Class 2 Objects Catalog". Retrieved on March 14, 2009.
  4. iNoMed (January 9, 2021). Message in #bots-and-mute-this on the Conwaylife Lounge Discord server
  5. David Raucci (December 11, 2029). Updated oscillator stamp collection (was: Re: Golly suggestions) (discussion thread) at the ConwayLife.com forums
  6. Mark D. Niemiec (November 27, 2016). Re: Help with names (discussion thread) at the ConwayLife.com forums
  7. praosylen (November 24, 2016). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  8. Apple Bottom (June 18, 2017). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  9. Luka Okanishi (November 25, 2016). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  10. Jeremy Tan (January 6, 2020). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  11. praosylen (September 28, 2020). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  12. Dave Greene (September 28, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  13. Jiahao Yu (January 9, 2021). Re: Soup search results (discussion thread) at the ConwayLife.com forums

External links

  • Mark D. Niemiec. Re: Soup search results (discussion thread) at the ConwayLife.com forums (burloaferimeter variants)