Quadpole

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Quadpole
5b2o$4bobo2$2bobo2$obo$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ LOOP 2 GPS 2 THUMBSIZE 2 ]]
Pattern type Oscillator
Family Barberpole
Number of cells 10
Bounding box 7×7
Frequency class 21.8
Period 2
Mod 1
Heat 8
Volatility 0.57
Strict volatility 0.57
Rotor type Pole 4
Discovered by MIT group
Year of discovery 1970

The quadpole (or tetrapole) is the barberpole of length 4.

Commonness

The quadpole is the eighth most common oscillator in Achim Flammenkamp's census, being less common than the bipole but more common than the great on-off.[1] It is the eighth most common oscillator on Adam P. Goucher's Catagolue. Despite behaving the same in Life as they do in HighLife, they are only about 2% as common in HighLife because the ship is not stable, preventing the reaction below from occurring.

The most common way by far for a quadpole to form is from a century predecessor hitting a ship. This is the basis of a 3-glider component found by Heinrich Koenig no later than July 2010.[2]


x = 7, y = 8, rule = B3/S23 bo$o$o$b3o2$4b2o$4bobo$5b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 GPS 2 LOOP 10 PAUSE 3 AUTOSTART ]]
Quadpole forming when a century predecessor collides with a ship
(click above to open LifeViewer)
RLE: here Plaintext: here

Glider synthesis

All strict still lifes with a population of 20 or fewer cells, as well as all oscillators and spaceships with 16 or fewer cells, are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.

See also

References

  1. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  2. Heinrich Koenig (July 3, 2010). Re: Methuselah from Gliders (discussion thread) at the ConwayLife.com forums

External links

  • 10P2.1 at Heinrich Koenig's Game of Life Object Catalogs