Long barge
| Long barge | |||||||||
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| Pattern type | Strict still life | ||||||||
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| Number of cells | 8 | ||||||||
| Bounding box | 5 × 5 | ||||||||
| Frequency class | 11.8 | ||||||||
| Static symmetry | Unspecified | ||||||||
| Discovered by | JHC group | ||||||||
| Year of discovery | 1970 | ||||||||
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Long barge is an 8-cell still life discovered by the JHC group in 1970.[1] It is a long version of a barge. It can be trivially extended to produce ever longer barges.
It can "eat" two domino sparks, such as those produced by pentadecathlon; said sparks can be replaced with blocks to form unix.
Commonness
Long barge is the fourteenth most common still life on Adam P. Goucher's Catagolue, being less common than eater 1 but more common than aircraft carrier. Among all still lifes with 8 cells, it is the third most common, being less common than mango but more common than long ship.[2] It is also the nineteenth most common object overall on Catagolue.
In Achim Flammenkamp's census, the long barge was also ranked fourteenth most common, again between eater 1 and aircraft carrier.[3]
Occurrence
The barge is 7.5 times as common as the long barge, but the long barge is 12,000 times as common as the very long barge. In diagonal symmetries (including 8-fold symmetry), the long barge is the eleventh most common object, which makes it more common than the barge. Reactions which form the long barge are demonstrated below.
| Long barges are almost always formed by a symmetric or near-symmetric active region hitting a pond (click above to open LifeViewer) RLE: here Plaintext: here |
Glider synthesis
All strict still lifes with a population of 22 or fewer cells, all oscillators with 16 or fewer cells, and all spaceships with 31 or fewer cells are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.
Longer versions
Since the barge is infinitely extensible, there are an infinite number of long^n barges, one for every positive n:
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References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on June 18, 2009.
- ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
- ↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on March 30, 2010.
External links
- Long barge at the Life Lexicon
- The 9 eight-bit still-lifes at Mark D. Niemiec's Life Page
- 14.598 at Heinrich Koenig's Game of Life Object Catalogs
- 16.3111 at Heinrich Koenig's Game of Life Object Catalogs
- 18.17791 at Heinrich Koenig's Game of Life Object Catalogs
| Vessels | |
|---|---|
| No corners (barges) | (^-2) • (^-1) • ^0 • ^1 • ^2 • ^3 |
| One corner (boats) | (^-2) • (^-1) • ^0 • ^1 • ^2 • ^3 |
| Two corners (ships) | (^-1) • ^0 • ^1 • ^2 • ^3 |
- Patterns
- Patterns with Catagolue frequency class 11
- Natural periodic objects
- Periodic objects with minimum population 8
- Patterns with 8 cells
- Patterns found by JHC group
- Patterns found in 1970
- Patterns that can be constructed with 3 gliders
- Still lifes
- Strict still lifes
- Strict still lifes with 8 cells
- Patterns with rectangular diagonal symmetry