Fumarole: Difference between revisions
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'''Fumarole''' is a | '''Fumarole''' is a {{period|5}} [[oscillator]] that was found by [[Dean Hickerson]] in September {{year|1989}}. In terms of its {{cells|18}} [[cell]]s 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 [[polyomino#domino|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, {{year|1995}}, [[Noam Elkies]] found a way to non-trivially combine two fumaroles and a [[blinker]] into a period {{period|10|brief}} oscillator, shown below;<ref>x-oscs-new-p001-019.lif pattern collection</ref> 4 can be combined in a similar fashion. In February {{year|2000}} [[Stephen Silver]] found a {{gliders|7}} [[synthesis]] of this oscillator.<ref>{{CiteSummersPattern|name=jslife}}</ref> | ||
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Revision as of 00:07, 27 December 2019
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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 | 0.72 | ||||||||
| Kinetic symmetry | Unspecified | ||||||||
| Discovered by | Dean Hickerson | ||||||||
| Year of discovery | 1989 | ||||||||
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Fumarole is a period-5 oscillator that was found by Dean Hickerson in September 1989. 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;[1] 4 can be combined in a similar fashion. In February 2000 Stephen Silver found a 7-glider synthesis of this oscillator.[2]
On Catagolue, it is the second most common period 5 oscillator, being less common than octagon II but more common than Elkies' p5.[3]
Image gallery
 RLE: here |
See also
References
- ↑ x-oscs-new-p001-019.lif pattern collection
- ↑ Jason Summers' jslife pattern collection.
- ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.
External links
- Fumarole at the Life Lexicon
- 18P5.1 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
- 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