Boat
| Boat | |||||||||
| View static image | |||||||||
| Pattern type | Strict still life | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Number of cells | 5 | ||||||||
| Bounding box | 3 × 3 | ||||||||
| Frequency class | 2.8 | ||||||||
| Static symmetry | Unspecified | ||||||||
| Discovered by | JHC group | ||||||||
| Year of discovery | 1970 | ||||||||
| |||||||||
| |||||||||
| |||||||||
| |||||||||
The boat is the only still life with 5 cells and was discovered by the JHC group in 1970.[1] It can be thought of as a tub with an extra cell in one of the corners, or a ship with one of the corner cells removed. Like the tub and the ship, it is infinitely extensible (see long boat).
Uses in catalysis
The boat sees uses in, and can arise as a result of, certain interactions.
In the orientation shown in the infobox, moving the leftmost cell up one cell turns it back into a boat in one generation. This property allows it to be used as a catalyst in certain situations, such as the p21 B-heptomino hassler, p22 lumps of muck hassler, p35 honey farm hassler, the still life form of diuresis, the loaf spin reaction found in the p130 shuttle, and more. See Tutorials/Catalyses for more examples.
The boat can be hit by a glider to cleanly produce another glider, travelling perpendicular to the direction of the input glider. It is thus a one-time reflector.
A glider hitting certain still lifes in the correct way, such as a snake or eater 1, as well as oscillators such as the [[[beacon]] if correctly timed, will produce a boat; another glider in the same lane will cleanly destroy the boat. This is called a boat-bit. This reaction can be used in a similar way to an eater which works on pairs of gliders.
Commonness
The boat is the fourth most common still life in Achim Flammenkamp's census, being slightly less common than loaf and over four times as common as tub.[2] It is also the sixth most common object on Adam P. Goucher's Catagolue.[3]
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.
See also
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 January 15, 2009.
- ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
External links
- Boat at the Life Lexicon
- Boat at Adam P. Goucher's Catagolue
- The 1 five-bit still-life at Mark D. Niemiec's Life Page
| 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 2
- Natural periodic objects
- Periodic objects with minimum population 5
- Patterns with 5 cells
- Patterns found by JHC group
- Patterns found in 1970
- Patterns that can be constructed with 2 gliders
- Still lifes
- Strict still lifes
- Strict still lifes with 5 cells
- Patterns with bilateral diagonal symmetry
- Diagonal line stabilisations