P29 pre-pulsar shuttle
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| Pre-pulsar shuttle 29 | |||||||
| View animated image | |||||||
| View static image | |||||||
| Pattern type | Shuttle Oscillator | ||||||
|---|---|---|---|---|---|---|---|
| Number of cells | 54 | ||||||
| Bounding box | 28 × 28 | ||||||
| Period | 29 (mod: Unknown) | ||||||
| Heat | 41.5 | ||||||
| Volatility | 0.90 | 0.90 | ||||||
| Kinetic symmetry | Unspecified | ||||||
| Discovered by | David Buckingham | ||||||
| Year of discovery | 1980 | ||||||
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Pre-pulsar shuttle 29 (or prime) is a period-29 shuttle oscillator discovered by David Buckingham on August 2, 1980,[1] making it the first oscillator of that period to be found. In terms of its 54 cells it is the smallest known period-29 oscillator.[2] The oscillator works by combining the 15-generation, two-tub pre-pulsar shuttle mechanism used in Eureka with a 14-generation pre-pulsar shuttle mechanism. Hassling pre-pulsars in this way is currently the only known way of constructing period-29 oscillators, and some variations of this shuttle are shown below. In September 1994 Bill Gosper found that two copies of pre-pulsar shuttle 29 could be used to hassle a pentadecathlon. Gosper used to construct the P58 toadsucker.
Image gallery
 Generation 4 reveals two pre-pulsars (black) being hassled by a 15-generation mechanism (green) and a 14-generation mechanism (red). |
See also
References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on June 16, 2009.
- ↑ "Class 2 Objects Catalog". Retrieved on June 10, 2009.
Categories:
- Patterns
- Oscillators with 54 cells
- Periodic objects with minimum population 54
- Patterns with 54 cells
- Patterns found by David Buckingham
- Patterns found in 1980
- Oscillators
- Shuttles
- Shuttles with 54 cells
- Oscillators with period 29
- Prime-period oscillators
- Oscillators with heat 41
- Oscillators with volatility 0.90
- Oscillators with strict volatility 0.90
- Patterns with diagonal bilateral symmetry
- Pre-pulsar shuttle oscillators