Fumarole
| Fumarole | |||||||||||
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| Pattern type | Oscillator | ||||||||||
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| Number of cells | 18 | ||||||||||
| Bounding box | 8×7 | ||||||||||
| Frequency class | 35.8 | ||||||||||
| Period | 5 | ||||||||||
| Mod | 5 | ||||||||||
| Heat | 12.8 | ||||||||||
| Volatility | 0.72 | ||||||||||
| Strict volatility | 0.72 | ||||||||||
| Discovered by | Dean Hickerson | ||||||||||
| Year of discovery | 1989 | ||||||||||
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Fumarole is a period-5 oscillator that was found by Dean Hickerson on September 3, 1989.[1] In terms of its 18 cells it is the fourth smallest period 5 oscillator, after pseudo-barberpole, octagon 2, and Silver's p5; however, its 7×8 bounding box is the smallest of any known period 5 oscillator.
The domino spark that it provides makes it useful in the construction of higher period oscillators such as the p35 beehive hassler, p40 B-heptomino shuttle, and 98P25. On September 1, 1995, Noam Elkies found a way to non-trivially combine two fumaroles and a blinker into a period 10 oscillator, shown below;[2] 4 can be combined in a similar fashion.
| 2 fumaroles and a blinker (click above to open LifeViewer) RLE: here Plaintext: here |
In February 2000 Stephen Silver found a 7-glider synthesis of this oscillator.[3]
Commonness
On Catagolue, it is the second most common period 5 oscillator, being less common than octagon II but more common than Elkies' p5.[4]
| A very common predecessor of fumarole involves two blocks and a region resembling two xWSS heads glued together.[5] (click above to open LifeViewer) RLE: here Plaintext: here |
See also
References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
- ↑ x-oscs-new-p001-019.lif pattern collection
- ↑ Jason Summers' jslife pattern collection.
- ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.
- ↑ Dave Greene (March 12, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
External links
- Fumarole at the Life Lexicon
- 18P5.1 at Heinrich Koenig's Game of Life Object Catalogs
- Fumarole at Wikipedia (origin of name)
- Patterns
- Patterns with Catagolue frequency class 35
- Natural periodic objects
- Oscillators with 18 cells
- Periodic objects with minimum population 18
- Patterns with 18 cells
- Patterns found by Dean Hickerson
- Patterns found in 1989
- Patterns that can be constructed with 7 gliders
- Oscillators
- Oscillators with period 5
- Oscillators with mod 5
- Oscillators with heat 12
- Oscillators with volatility 0.72
- Oscillators with strict volatility 0.72
- Patterns with bilateral orthogonal symmetry
- Sparkers
- Sparkers with period 5
- Domino sparkers
- Moderate sparkers