Carnival shuttle
| Carnival shuttle | |||||||||
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| Pattern type | Oscillator | ||||||||
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| Oscillator type | Shuttle | ||||||||
| Number of cells | 43 | ||||||||
| Bounding box | 24 × 7 | ||||||||
| Period | 12 (mod: 6) | ||||||||
| Heat | 38 | ||||||||
| Volatility | 0.91 | 0.27 | ||||||||
| Kinetic symmetry | -c+e | ||||||||
| Discovered by | Robert Wainwright | ||||||||
| Year of discovery | 1984 | ||||||||
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Carnival shuttle is a period-12 oscillator that was found by Robert Wainwright in September 1984.[1] The shuttle itself is a reaction between two T-tetrominoes, whose stability requires the suppression of one birth per period at both ends of the shuttle.
As shuttles can be placed head to head, it can be viewed as a finite segment of an extensible wick, and there are many ways to terminate this wick. The earliest version used middleweight emulators at the end, which got reduced to the much smaller monograms shown in the infobox. Other period-4 sparkers including T-nosed p4 and blocked p4-3 work. More recent stabilizations include the stable beehive push catalyst by Tanner Jacobi in 2020[2] and p3 pipsquirters by 83bismuth38 in 2021.[3]
In addition to pushing a beehive, adjacent shuttles can hassle more complex components involving paired beehives, loaves or traffic lights (interchange). The interchange part emits domino sparks, which was used to create the first known non-trivial period-24 oscillator, 186P24. The loaf-hassling reaction is similar to the catalyst in the stable twirling T-tetsons 2.
| A collection of carnival shuttle reactions (click above to open LifeViewer) RLE: here Plaintext: here |
A 26-glider synthesis for the infobox form was found by GUYTU6J on April 4, 2022.[4] On February 29, 2024, KtT lowered the cost to 21 gliders.[5][6]
On September 30, 2022, Charity Engine found a symmetric soup containing a twofold carnival shuttle.[7] A 37-glider synthesis of the double carnival shuttle was found by Carson Cheng on July 27, 2023.[8] He reduced the cost to 22 gliders on January 18, 2024.[9]
References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
- ↑ praosylen (December 20, 2020). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ 83bismuth38 (October 22, 2021). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ GUYTU6J (April 4, 2022). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ KtT (February 29, 2024). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ shinjuku (#6287405689) (February 29, 2024). Job triggered by Adam P. Goucher at GitLab Catagolue project.
- ↑ Carson Cheng (October 5, 2022). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ Carson Cheng (July 27, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ Carson Cheng (January 18, 2024). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
External links
- Carnival shuttle at the Life Lexicon
- 43P12.1 at Heinrich Koenig's Game of Life Object Catalogs
- Carnival shuttle at Adam P. Goucher's Catagolue
- Carnival shuttles hassling beehive at Adam P. Goucher's Catagolue
- Patterns
- Oscillators with 43 cells
- Periodic objects with minimum population 43
- Patterns with 43 cells
- Patterns found by Robert Wainwright
- Patterns found in 1984
- Patterns that can be constructed with 21 gliders
- Oscillators
- Shuttles
- Oscillators with period 12
- Oscillators with mod 6
- Oscillators with heat 38
- Oscillators with volatility 0.91
- Oscillators with strict volatility 0.27
- Oscillators with -c+e symmetry