Aircraft carrier
| Aircraft carrier | |||||||||
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| Pattern type | Strict still life | ||||||||
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| Number of cells | 6 | ||||||||
| Bounding box | 4 × 3 | ||||||||
| Frequency class | 12.0 | ||||||||
| Discovered by | John Conway | ||||||||
| Year of discovery | 1970 | ||||||||
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Aircraft carrier (or simply carrier) is a 6-cell still life, and the smallest still life that has more than one island. It consists of two pre-blocks.
Commonness
- Main article: List of common still lifes
Aircraft carrier is the fifteenth most common still life in Achim Flammenkamp's census, being less common than long barge but more common than paperclip.[1]
Aircraft carrier is the fifteenth most common still life on Adam P. Goucher's Catagolue, being less common than long barge but more common than paperclip. Among all still lifes with 6 cells, it is the fourth most common, being less common than barge but more common than snake.[2]It is also the twentieth most common object overall on Catagolue.
Construction
A number of ways of constructing an aircraft carrier can be found in Mark Niemiec's glider synthesis database.[3]
There are three 3-glider collisions that produce an aircraft carrier as well as another object. The first one leaves a stray block, the second a beehive and the third a blinker, leading to three two-stage four-glider syntheses for the still life. Other 4-glider collisions that make a clean aircraft carrier are also known.
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Use in larger still lifes
Pre-blocks in an aircraft carrier configuration are commonly used for stabilization. Sometimes, but not always, a snake is equivalent, such as the disconnected portion of 55P10 and the yellow aircraft carrier in the image below. Other times, such as the line-of-five part of 31.4 or the light pink motif below, an aircraft carrier is the unique smallest thing that works. The common theme is that the green region is typically one with birth on B3j; the lower blue cell must have something adjacent to prevent it from turning on, but the upper blue cell must have only one cell, not two, touching it to prevent it from turning on, and the live cell to the right of the lower blue cell must not have any more neighbouring cells to prevent it from dying of overpopulation.
| A still life as described above. The starting region is the polyplet in the middle, which consists of two different colours, and the other islands are used to stabilise it (click above to open LifeViewer) Catagolue: here |
See also
References
- ↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on March 30, 2010.
- ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
- ↑ 6ac.rle at Mark D. Niemiec's Life Page
External links
- Aircraft carrier at the Life Lexicon
- Carrier at Adam P. Goucher's Catagolue
- The 5 six-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 0/6ac.rle)
- Aircraft Carrier at Heinrich Koenig's Game of Life Object Catalogs
- Patterns
- Patterns with Catagolue frequency class 12
- Natural periodic objects
- Periodic objects with minimum population 6
- Patterns with 6 cells
- Patterns found by John Conway
- Patterns found in 1970
- Patterns that can be constructed with 4 gliders
- Still lifes
- Strict still lifes
- Strict still lifes with 6 cells
- Patterns with 180-degree rotation symmetry