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 in Achim Flammenkamp's census, being less common than eater 1 but more common than aircraft carrier.[2]
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.[3] It is also the nineteenth most common object overall on Catagolue.
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.
| 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:
Very long barge
- Main article: Very long barge
Long^3 barge
- Main article: Long^3 barge
Long^4 barge
Long4 barge (or remarkably long barge) is the long^4 version of the barge. It is a 14-bit still life.
Long^5 barge
Long5 barge (or very4 long barge) is the long^5 version of the barge. It is a 16-bit still life.
Long^6 barge
Long6 barge (or very5 long barge) is the long^6 version of the barge. It is a 18-bit still life.
References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on June 18, 2009.
- ↑ 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.
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