Cis-snake on bookend

Cis-snake on bookend
x = 6, y = 4, rule = B3/S23 2o2b2o$o2bobo$bobo$2ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]]
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Pattern type	Strict still life
Number of cells	13
Bounding box	6 × 4
Frequency class	28.4
Static symmetry	Unspecified
Discovered by	Unknown
Year of discovery	Unknown
Rules Outer-totalistic rules B/S23 – B3678/S012345678 # of rules 211 = 2048 Isotropic rules B/S2aek3nr – B2in34-iry5-jqr678/S012345678
Glider synthesis Fewest gliders 5 Catagolue-generated RLE synthesis Uploaded synthesis RLE cissnakeonbookend_synth.rle
Pattern files Plaintext cissnakeonbookend.cells RLE cissnakeonbookend.rle
Identifiers apgcode xs13_39e0db Niemiec ID 13.223 Pentadecathlon ID 13.17

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

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. A 5-glider synthesis was found in March 2022.

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 (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 (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 (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.

Isomers

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

See also

• Trans-snake on bookend

External links

• Cis-snake on bookend at Adam P. Goucher's Catagolue
• 13.17 at Heinrich Koenig's Game of Life Object Catalogs
• The 240 thirteen-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 13/13-223.rle)