Difference between revisions of "Pre-pulsar shuttle 29"
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Revision as of 20:48, 4 December 2019
| Pre-pulsar shuttle 29 | |||||||||||
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| Pattern type | Oscillator | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oscillator type | Shuttle | ||||||||||
| Number of cells | 54 | ||||||||||
| Bounding box | 28×28 | ||||||||||
| Period | 29 | ||||||||||
| Mod | 29 | ||||||||||
| Heat | 41.5 | ||||||||||
| Volatility | 0.90 | ||||||||||
| Strict volatility | 0.90 | ||||||||||
| Discovered by | David Buckingham | ||||||||||
| Year of discovery | 1980 | ||||||||||
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Pre-pulsar shuttle 29 (or prime[citation needed]) 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 was the only known way of constructing period 29 oscillators until the discovery of the p29 traffic-farm hassler, 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 it to construct the p58 toadsucker.
A 42-glider synthesis is known for a variant of this oscillator, 56P29, which is shown below.[3]
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.
- ↑ Adam P. Goucher. "xp29_wgg0s4w255202552w4s0ggz320f811w4r4x4r4w118f023zzy4252y1252". Catagolue. Retrieved on June 6, 2019.
External links
- 54P29.1 at Heinrich Koenig's Game of Life Object Catalogs
- Patterns
- Oscillators with 54 cells
- Patterns with 54 cells
- Patterns found by David Buckingham
- Patterns found in 1980
- Patterns that can be constructed with 30 gliders
- Oscillators
- Periodic objects with minimum population 54
- Shuttles
- Oscillators with period 29
- Oscillators with mod 29
- Oscillators with heat 41
- Oscillators with volatility 0.90
- Oscillators with strict volatility 0.90
- Patterns with bilateral diagonal symmetry
- Sparkers
- Sparkers with period 29
- Strong sparkers
- Pre-pulsar shuttle oscillators
