Cis-snake on bookend

From LifeWiki
Jump to navigation Jump to search
Cis-snake on bookend
x = 6, y = 4, rule = B3/S23 2o2b2o$obo2bo$2bobo$b2ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]]
View static image
Pattern type Strict still life
Number of cells 13
Bounding box 6 × 4
Frequency class 28.4
Static symmetry n (C1)
Discovered by Unknown
Year of discovery Unknown

Cis-snake on bookend is a 13-cell still life which involves a snake stabilising a bookend.

This specific isomer is named cis due to having a smaller bounding box, as the two "ends" of each island are effectively aligned. The other isomer, trans-snake on bookend, has a larger bounding box. Since the snake is a stable pattern by itself, the term on is used rather than and.

Usage

A single bookend is sometimes used as a catalyst. As the bookend alone is not stable, it has to be stabilised, and a snake on bookend is the smallest way to do so.

Construction

This still life is known to be constructible with 5 gliders.[1] A 5-glider synthesis was found in March 2022.[2]

x = 17, y = 28, rule = B3/S23 14b2o$2bo9bo2bo$2o10b3o$b2o$12b2obo$12bob2o11$7b3o$3o4bo$o7bo$bo$14b3o $14bo$15bo3$13b2o$12b2o$14bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 420 THEME Book ZOOM 10 AUTOSTART GPS 12 T 0 PAUSE 1 T 20 PAUSE 3 T 25 PAUSE 1 T 81 PAUSE 2 LOOP 82 ]]
A 5G synthesis[2]
(click above to open LifeViewer)
x = 45, y = 31, rule = B3/S23 2bo37bo$obo36bo$b2o36b3o7$10bo$11bo$9b3o2$16bo$14bobo$15b2o4$33bo$33bo bo$33b2o$43b2o$41bo2bo$41b3o2$41b2obo$41bob2o$13b2o$14b2o$13bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 410 THEME Book ZOOM 10 Y 2 AUTOSTART GPS 12 T 0 PAUSE 1 T 20 PAUSE 3 T 31 PAUSE 1 T 64 PAUSE 1 T 78 PAUSE 2 LOOP 79 ]]
A 6G synthesis[3]
(click above to open LifeViewer)
x = 33, y = 29, rule = B3/S23 18bo$18bobo$4bo13b2o$5bo$3b3o8$31b2o$29bo2bo$29b3o2$29b2obo$3b2o24bob 2o$4b2o$3bo3$b3o$3bo12b2o$2bo12b2o3b3o$17bo2bo$bo19bo$b2o$obo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 390 THEME Book ZOOM 10 AUTOSTART GPS 12 T 0 PAUSE 1 T 20 PAUSE 3 T 29 PAUSE 2 LOOP 30 ]]
A 7G synthesis[4]
(click above to open LifeViewer)

Occurrence

See also: List of common still lifes, List of still lifes with 13 cells

Cis-snake on bookend is the 59th most common 13-cell still life out of 240.

There are no collisions in octohash, octo3obj or octo3g databases with this still life in the ash.

References

  1. ↑ xs13_39e0db at Adam P. Goucher's Catagolue
  2. ↑ 2.0 2.1 shinjuku (#2178812056) (March 8, 2022). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  3. ↑ xs13_39e0db (archived copy)
  4. ↑ The 240 thirteen-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 13/13-223.rle)
Retrieved from "https://conwaylife.com/w/index.php?title=Cis-snake_on_bookend&oldid=159631"