Bipole
| Bipole | |||||||||
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| Pattern type | Oscillator | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Oscillator type | Muttering moat | ||||||||
| Family | Barberpole | ||||||||
| Number of cells | 8 | ||||||||
| Bounding box | 5 × 5 | ||||||||
| Frequency class | 21.7 | ||||||||
| Period | 2 | ||||||||
| Mod | 1 | ||||||||
| Heat | 4 | ||||||||
| Volatility | 0.40 | ||||||||
| Strict volatility | 0.40 | ||||||||
| Rotor type | Pole 2 | ||||||||
| Discovered by | MIT group | ||||||||
| Year of discovery | 1970 | ||||||||
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The bipole is the barberpole of length 2 and is thus an oscillator of period 2. It is the smallest possible barberpole. Its rotor is identical to blinker and fore and back.
Adding one cell in the middle gives integral sign, while adding two cells gives very long ship.
The bipole is the fifth smallest of all oscillators, and the only oscillator with a minimum population of 8 cells.
| An unusual use of a bipole in a period-736 glider gun, where a snake-type catalyst is needed, but using a still life would interfere with another part of the gun[1] (click above to open LifeViewer) RLE: here Plaintext: here |
Construction
| A 4G synthesis of the bipole[2] (click above to open LifeViewer) |
On April 19, 2022, a 4-glider synthesis of the bipole was submitted to Catagolue by Carson Cheng.[3] However, because he did not further publicize his discovery at the time, it remained unnoticed by the wider community until June of that year.[4]
| Five-glider syntheses[5] (click above to open LifeViewer) |
Occurrence
- See also: List of common oscillators
The bipole is the seventh most common oscillator in Achim Flammenkamp's census, being less common than the clock and pentadecathlon but more common than the quadpole.[6] It is the seventh most common oscillator on Adam P. Goucher's Catagolue.
There is a three-glider collision with an occurrence of bipole in the ash.[7] Bipole occurs in final patterns of two collisions in the octo3obj database.[8]
See also
References
- ↑ Tanner Jacobi (November 8, 2017). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
- ↑ shinjuku (#2349746851) (April 19, 2022). Job triggered by Adam P. Goucher at GitLab Catagolue project.
- ↑ Carson Cheng (July 15, 2022). Message in #cgol on the Conwaylife Lounge Discord server
- ↑ Ian07 (June 12, 2022). Re: 4 glider syntheses (discussion thread) at the ConwayLife.com forums
- ↑ The 1 eight-bit period 2 oscillator at Mark D. Niemiec's Life Page (download pattern file: 0/8bp.rle)
- ↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
- ↑ Headerless RLE: o$b2o$2o25$73bo$71b2o$72b2o$68bo$69bo$67b3o!
- ↑ 2o7b2o$2o7b2o2$2o7b2o$2o7b2o2$11b3o$6b3o2bo$12bo! and 2o$2o4$3b2o$2bo2bo2b2o$3b2o3b2o2$4bo$3b2o$3bobo!
External links
- Bipole at the Life Lexicon
- Bipole at Adam P. Goucher's Catagolue
- 8P2.1 at Heinrich Koenig's Game of Life Object Catalogs
- The 1 eight-bit period 2 oscillator at Mark D. Niemiec's Life Page (download pattern file: 0/8bp.rle)
- Patterns
- Patterns with Catagolue frequency class 21
- Natural periodic objects
- Oscillators with 8 cells
- Periodic objects with minimum population 8
- Patterns with 8 cells
- Patterns found by MIT group
- Patterns found in 1970
- Patterns that can be constructed with 4 gliders
- Oscillators
- Barberpole variants
- Muttering moats
- Oscillators with period 2
- Oscillators with mod 1
- Oscillators with heat 4
- Oscillators with volatility 0.40
- Oscillators with strict volatility 0.40
- Oscillators with rotor Pole 2
- Patterns with 180-degree rotation symmetry
- Flipping oscillators
- Extendable oscillators