Bracket pulsar
| Bracket pulsar | |||||||||
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| Pattern type | Oscillator | ||||||||
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| Number of cells | 48 | ||||||||
| Bounding box | 15 × 15 | ||||||||
| Period | 3 (mod: 3) | ||||||||
| Heat | 53.3 | ||||||||
| Volatility | 0.91 | 0.91 | ||||||||
| Kinetic symmetry | *c | ||||||||
| Discovered by | Hartmut Holzwart | ||||||||
| Year of discovery | 1993 | ||||||||
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Bracket pulsar[note 1] is a period-3 oscillator discovered by Hartmut Holzwart on the 5th of March, 1993.[1] Despite being identical in population and bounding box to the pulsar, it is much rarer, having never appeared naturally so far. However, one in 21,000 odd-width eightfold symmetric soups (D8_1) form a bracket pulsar in the centre.
It is one of three notable extensible families of p3 oscillators with D8 symmetry, the others being the pulsar and the cross. Its next extension is the bracket quasar, named in analogy to the quasar.
Unlike the pulsar and cross families, the quadrants of the bracket pulsar are able to be skewed in relation to each other. For the pulsar case this permits three derivative oscillators, one with a single 2-cell shift, and two with an additional 2-cell shift:
Notes
- ↑ named as such on Catagolue; name added by Goucher in July 2021. Link to commit: https://gitlab.com/hatsya/open-source/catagolue/-/commit/b2d236b90881bb0ce352f0f3b54f3d8b787790a0
References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on 14 December 2021.
External links
- Bracket pulsar at Adam P. Goucher's Catagolue
- 48P3.12 at Heinrich Koenig's Game of Life Object Catalogs
- Patterns
- Oscillators with 48 cells
- Periodic objects with minimum population 48
- Patterns with 48 cells
- Patterns found by Hartmut Holzwart
- Patterns found in 1993
- Patterns that can be constructed with 21 gliders
- Oscillators
- Oscillators with period 3
- Oscillators with mod 3
- Oscillators with heat 53
- Oscillators with volatility 0.91
- Oscillators with strict volatility 0.91
- Oscillators with *c symmetry
- Semi-natural periodic objects
- Extendable oscillators