Long boat
| Long boat | |||||||||
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| Pattern type | Strict still life | ||||||||
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| Number of cells | 7 | ||||||||
| Bounding box | 4 × 4 | ||||||||
| Frequency class | 6.6 | ||||||||
| Discovered by | JHC group | ||||||||
| Year of discovery | 1970 | ||||||||
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Long boat is a 7-cell still life that is an extensible longer version of a boat. It was found by the JHC group in 1970.[1]
Occurrence
- See also: List of common still lifes
Long boat is the eighth most common still life on Adam P. Goucher's Catagolue, being less common than pond but more common than ship-tie. Among all still lifes with 7 cells, it is the second most common, being less common than loaf but more common than eater 1.[2]It is also the tenth most common object overall on Catagolue.
The long boat was also the eighth most common still life in Achim Flammenkamp's census, being less common than ship but more common than ship-tie.[3]
Formation
The long boat has two six-cell predecessors. The second can be turned into a glider by placing a tub with centre four cells below the "bend" in the pattern.
| Two six-cell predecessors of the long boat (click above to open LifeViewer) RLE: here Plaintext: here |
Glider synthesis
Long boat can be constructed using only 3 gliders; its first glider synthesis was found by John Abbott.[4] There are multiple ways to synthesize a long boat using three gliders, two of which involve a glider hitting a beehive or loaf in a synchronized way only possible if the beehive or loaf had just formed. This can be useful in soup-based glider syntheses, as the beehive/loaf (predecessor) can sometimes be synthesized together with another object more cheaply than synthesizing the two separately.[5]
Uses
A long boat can be used as a 90° or 180° one-time turner.
A transparent long boat is used as a bait object in the NW-2T16 converter.
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 January 15, 2009.
- ↑ Life Credits at Mark D. Niemiec's Life Page
- ↑ MathAndCode (December 12, 2020). Re: Still Life Synthesis Thread (discussion thread) at the ConwayLife.com forums
External links
- Long boat at the Life Lexicon
- Long boat at Adam P. Goucher's Catagolue
- The 4 seven-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 0/7lb.rle)
- Long Boat 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 6
- Natural periodic objects
- Periodic objects with minimum population 7
- Patterns with 7 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 7 cells
- Patterns with bilateral diagonal symmetry