Cross: Difference between revisions
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{{seminatural}} | {{seminatural}} | ||
{{Sparker|p=3|strength=weak}} | {{Sparker|p=3|strength=weak}} | ||
[[Category: | [[Category:Polyominoes]] | ||
Revision as of 21:41, 29 June 2022
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| Pattern type | Oscillator | ||||||||
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| Number of cells | 28 | ||||||||
| Bounding box | 10 × 10 | ||||||||
| Period | 3 (mod: 3) | ||||||||
| Heat | 26.7 | ||||||||
| Volatility | 0.83 | 0.83 | ||||||||
| Kinetic symmetry | Unspecified | ||||||||
| Discovered by | Robert Wainwright | ||||||||
| Year of discovery | 1989 | ||||||||
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Cross is a period-3 oscillator that was found in October 1989 by Robert Wainwright.[1] It is the smallest in an infinite family of period 3 oscillators, the next of which is cross 2. The fact that this infinite family of oscillators exists shows that there are an infinite number of oscillators that are polyominoes in at least one of their phases. In August 2004 Jason Summers found a 16-glider synthesis of this oscillator.[2]
According to Catagolue, it is the fifty-seventh most common object in even 8-fold symmetry (D8_4), occurring in 1 in 4600 soups.
See also
- Star
- Bent keys, odd keys, and short keys, which have the same edge behaviour
References
External links
- Cross at the Life Lexicon
Categories:
- Patterns
- Oscillators with 28 cells
- Periodic objects with minimum population 28
- Patterns with 28 cells
- Patterns found by Robert Wainwright
- Patterns found in 1989
- Patterns that can be constructed with 15 gliders
- Oscillators
- Oscillators with period 3
- Oscillators with mod 3
- Oscillators with heat 26
- Oscillators with volatility 0.83
- Oscillators with strict volatility 0.83
- Patterns with complete square symmetry
- Semi-natural periodic objects
- Sparkers
- Sparkers with period 3
- Weak sparkers
- Polyominoes