p29 pre-pulsar shuttle
| p29 pre-pulsar shuttle | |||||||||||
| View animated image | |||||||||||
| View static image | |||||||||||
| 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 | ||||||||||
| |||||||||||
| |||||||||||
| |||||||||||
| |||||||||||
p29 pre-pulsar shuttle (or prime[1]) 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.
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.
In September 1994 Bill Gosper found that two copies of a variant of pre-pulsar shuttle 29 could be used to hassle a pentadecathlon, resulting in p29 pentadecathlon hassler. Gosper used this to construct the p58 toadsucker.
Some variants of this shuttle are also known and have been synthesised over the years. For example, a linear form with two pre-pulsars and two house siamese shillelaghs was synthesized in 28 gliders by Mark Niemiec and Heinrich Koenig in September 2007.[2] Later, a 43-glider synthesis for another 56-cell variant (56P29) was found by Martin Grant in October 2013,[3] which has since been reduced to 33 gliders.
A fourfold symmetric variant of this oscillator was first known to appear semi-naturally in December 2014, in a soup found by Richard Schank using apgsearch.[4] As discovered by Jeremy Tan, it has a very simple 24-glider synthesis because just four lumps of muck and four pi-heptominoes with fourfold rotational symmetry produces the oscillator plus eight blocks farther out.[5] A 31-glider synthesis for the infobox form was also provided in the same post.
Gallery
 Generation 4 reveals two pre-pulsars (black) being hassled by a 15-generation mechanism (green) and a 14-generation mechanism (red) |
| ||||
|
|
See also
- p26 pre-pulsar shuttle
- p28 pre-pulsar shuttle
- p47 pre-pulsar shuttle
- p58 pre-pulsar shuttle
- p55 pre-pulsar hassler
References
- ↑ 1.0 1.1 Dean Hickerson's oscillator stamp collection. Retrieved on December 8, 2019.
- ↑ More Glider Constructions at Game of Life News. Posted by Heinrich Koenig on September 16, 2007.
- ↑ Martin Grant (October 11, 2013). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ Richard Schank (December 18, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ Jeremy Tan (June 7, 2019). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
External links
- 54P29.1 at Heinrich Koenig's Game of Life Object Catalogs
- New Oscillators at Game of Life News. Posted by Heinrich Koenig on January 08, 2009.
- Patterns
- Oscillators with 54 cells
- Periodic objects with minimum population 54
- Patterns with 54 cells
- Patterns found by David Buckingham
- Patterns found in 1980
- Patterns that can be constructed with 30 gliders
- Oscillators
- 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