Difference between revisions of "Overweight spaceship"

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{{Pattern
{{Pattern
|name        = Overweight spaceship
|name        = Overweight spaceship
|pname        = owss
|pname        = 7wss
|c            = 15
|c            = 15
|bx          = 8
|bx          = 8
Line 7: Line 7:
|discoverer  = John Conway
|discoverer  = John Conway
|discoveryear = 1970
|discoveryear = 1970
|rulemin      = B3/S23
|rulemax      = B368/S23
|rulespecial  = [[Conway's Game of Life|Conway Life]]
|isorulemin  = B3aij/S2eik3aijnr
|isorulemax  = B2n34-in5-ar67e8/S1e234-aw5-ijy6-kn7e
|plaintext    = true
|plaintext    = true
|rle          = true
|rle          = true
|synthesis    = 13
|synthesis    = 11
|synthesisrle = true
|synthesisRLE = true
|viewerconfig = #C [[ THUMBSIZE 3 ZOOM 24 HEIGHT 500 GPS 4 TRACKLOOP 8 -1/2 0 ]]
}}
}}
An '''overweight spaceship''' (or '''OWSS''' for short) is a would-be [[spaceship]] similar to the [[lightweight spaceship]], [[middleweight spaceship]] and [[heavyweight spaceship]], but longer. On its own an overweight spaceship is unstable because the three [[cell]]s at its top do not die off like the corresponding [[spark]]s at the top of the smaller spaceships. Nonetheless, it can be escorted by true spaceships to form a [[Types_of_spaceships#Flotilla|flotilla]].
An '''overweight spaceship''' (or '''OWSS''' for short) is a would-be [[spaceship]] similar to the [[lightweight spaceship]], [[middleweight spaceship]] and [[heavyweight spaceship]], but longer. On its own an overweight spaceship is unstable. While the latter two [[xWSS]]es produce [[belly spark]]s that would die off, an overweight spaceship produces an [[egg]] that does not vanish but interferes with the body.


[[Image:overweight_with_escort.png|left|x125px|thumb|Overweight Spaceship with escort]] For OWSS with top spark over 4, minimal escort size difference is 4, as shown.
== Naming ==
As there are an infinite number of overweight spaceships, it becomes neccessary to distinguish between sizes. This is often done by assigning each overweight spaceship a number corresponding to the length of its "line" section in its less dense phase. As such, the smallest overweight spaceship is referred to as the "7WSS".


==Meta-Flotillas==
In this naming system, "4WSS", "5WSS" and "6WSS" would correspond to the lightweight, middleweight and heavyweight spaceships (although using such terminology is never recommended), and "3WSS" to an [[underweight spaceship]] ([[roteightor]] segment).
It is also possible to stabilize the OWSS with more OWSS, which then have to be stabilized by more OWSS/A *WSS. An example is shown below.
[[Image:OWSS-F3.png|center|x250px|thumb|Overweight Spaceship supported by more overweight spaceships.]]


==In other rules==
The length of a spaceship's belly "spark" can be seen to be this value minus four; a 7WSS's belly "spark" is three cells in length.
The [[non-totalistic Life-like cellular automaton|non-totalistic]] rule [[FattyLife]] (B3-n4nt5qr6i/S23) is specifically tailored to support the overweight spaceship with spark length 3, making it [https://catagolue.appspot.com/object/xq8_27deeee6/b3-n4nt5qr6is23 a p8 spaceship.]


==External links==
== As a spaceship component ==
{{LinkLexicon|lex_o.htm#owss}}
An overweight spaceship can be escorted by true spaceships to form a [[flotilla]]. [[Standard spaceship flotilla#Two standard spaceships, one overweight spaceship|There are several possibilities]] for escorting one overweight spaceship via two standard spaceships.
 
For an OWSS with a top "spark" length over 4, the minimal escort size difference is 4, as shown below. It is also possible to stabilize an OWSS with more OWSSes, which then have to be stabilized by more xWSSes. Some sufficiently large extensions like this can be seen as a stabilisation of a period-4, one-dimensional [[agar]], similar to a [[greyship]] (although ultimately lacking the 50% density requirement to be truly classified as one).<ref>https://conwaylife.com/forums/viewtopic.php?f=7&t=2036&p=141393#p141393</ref>
 
{|style="margin:auto;width:300px;"
|{{EmbedViewer
|pname        = lwsson7wssonlwss1
|viewerconfig = #C [[ THUMBSIZE 2 ZOOM 10 GPS 12 ]]
|position    = center
|caption      = 7WSS with escorts
|apgcode      = xq4_6ruc0sur6x6ruczy1377
}}
|{{EmbedViewer
|pname        = lwsson8wssonlwss1
|viewerconfig = #C [[ THUMBSIZE 2 ZOOM 10 GPS 12 ]]
|position    = center
|caption      = 8WSS with escorts
|apgcode      = xq4_gcso0uvvy0gcsoz131w37d6x131
}}
|-
|{{EmbedViewer
|pname        = owssflotilla
|viewerconfig = #C [[ THUMBSIZE 2 ZOOM 10 GPS 12 ]]
|position    = center
|caption      = Overweight spaceship supported by more overweight spaceships
|apgcode      = xq4_y1g0gy0o4040101uxo4040g0gzs20iy0vxvy3vxvy3vxs20iz111w2447xvgg8y0vxvgg802447x111zyd1223
}}
|}
 
== Glider synthesis ==
Many lengths of overweight spaceship can be constructed by means of [[glider synthesis]].<ref name="post77160" />  Recent syntheses are collected in the <tt>xq4</tt> synthesis listed in [[Catagolue]];<ref>{{citeCatagolue|page=census/b3s23/synthesis-costs/xq4|title=synthesis-costs/xq4 census}}</ref> a number of older recipes can be found in [[Mark Niemiec]]'s synthesis database.<ref>{{LinkNiemiec|flotilla.htm#ss-owss|title=Overweight spaceship flotillae|nobullet=nobullet}}</ref>
 
== In other rules ==
The [[non-totalistic rule]] {{rl|FattyLife}} (B3-n4nt5qr6i/S23)<ref name="t2901" /><ref name="t3590" /> is specifically tailored to support the overweight spaceship with spark length 3, making it a p8 spaceship ({{cata|object/xq8_27deeee6/b3-n4nt5qr6is23|xq8_27deeee6}}).
 
== References ==
<references>
<ref name="post77160">{{LinkForumThread
|format = ref
|title  = Re: Small Spaceship Syntheses
|p      = 77160
|author = Martin Grant
|date  = June 5, 2019
}}</ref>
<ref name="t2901">{{LinkForumThread
|format = ref
|f      = 11
|t      = 2901
|p      = 44605
|title  = B3-n4nt5qr6i/S23 (FattyLife)
|date  = June 18, 2017
}}</ref>
<ref name="t3590">{{LinkForumThread
|format = ref
|f      = 12
|t      = 3590
|p      = 65481
|title  = FattyLife
|date  = November 8, 2018
}}</ref>
</references>
 
== External links ==
* {{LinkLexicon|lex_o.htm#owss}}


[[Category:XWSS variants]]
[[Category:XWSS variants]]
__NOTOC__

Latest revision as of 15:14, 20 March 2023

Overweight spaceship
x = 8, y = 5, rule = B3/S23 3b3o$bo5bo$o$o6bo$7o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 24 HEIGHT 500 GPS 4 TRACKLOOP 8 -1/2 0 ]]
View static image
Pattern type Miscellaneous
Number of cells 15
Bounding box 8 × 5
Discovered by John Conway
Year of discovery 1970

An overweight spaceship (or OWSS for short) is a would-be spaceship similar to the lightweight spaceship, middleweight spaceship and heavyweight spaceship, but longer. On its own an overweight spaceship is unstable. While the latter two xWSSes produce belly sparks that would die off, an overweight spaceship produces an egg that does not vanish but interferes with the body.

Naming

As there are an infinite number of overweight spaceships, it becomes neccessary to distinguish between sizes. This is often done by assigning each overweight spaceship a number corresponding to the length of its "line" section in its less dense phase. As such, the smallest overweight spaceship is referred to as the "7WSS".

In this naming system, "4WSS", "5WSS" and "6WSS" would correspond to the lightweight, middleweight and heavyweight spaceships (although using such terminology is never recommended), and "3WSS" to an underweight spaceship (roteightor segment).

The length of a spaceship's belly "spark" can be seen to be this value minus four; a 7WSS's belly "spark" is three cells in length.

As a spaceship component

An overweight spaceship can be escorted by true spaceships to form a flotilla. There are several possibilities for escorting one overweight spaceship via two standard spaceships.

For an OWSS with a top "spark" length over 4, the minimal escort size difference is 4, as shown below. It is also possible to stabilize an OWSS with more OWSSes, which then have to be stabilized by more xWSSes. Some sufficiently large extensions like this can be seen as a stabilisation of a period-4, one-dimensional agar, similar to a greyship (although ultimately lacking the 50% density requirement to be truly classified as one).[1]

x = 8, y = 16, rule = B3/S23 4o$o3bo$o$bo2bo$5bo$bo5bo$o$o6bo$7o4$4o$o3bo$o$bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 10 GPS 12 ]]
7WSS with escorts
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagolue: here
x = 9, y = 16, rule = B3/S23 2b4o$2bo3bo$2bo$3bo2bo2$bo6bo$o$o7bo$8o4$2b4o$2bo3bo$2bo$3bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 10 GPS 12 ]]
8WSS with escorts
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagolue: here
x = 40, y = 17, rule = B3/S23 18b3o$17bo2bo$12b3o5bo3b3o$12bo2bo4bo3bo2bo$6b3o3bo7bo3bo5b3o$5bo2bo3b o7bo3bo4bo2bo$3o5bo3bo7bo3bo7bo3b3o$o2bo4bo3bo7bo3bo7bo3bo2bo$o7bo3bo 7bo3bo7bo3bo$o7bo3bo7bo3bo7bo3bo$bobo4bo3bo7bo3bo7bo4bobo$8bo3bo7bo3bo 7bo$5bobo4bo7bo3bo4bobo$12bo7bo3bo$13bobo4bo4bobo$20bo$17bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 10 GPS 12 ]]
Overweight spaceship supported by more overweight spaceships
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagolue: here

Glider synthesis

Many lengths of overweight spaceship can be constructed by means of glider synthesis.[2] Recent syntheses are collected in the xq4 synthesis listed in Catagolue;[3] a number of older recipes can be found in Mark Niemiec's synthesis database.[4]

In other rules

The non-totalistic rule FattyLife (B3-n4nt5qr6i/S23)[5][6] is specifically tailored to support the overweight spaceship with spark length 3, making it a p8 spaceship (xq8_27deeee6).

References

  1. ↑ https://conwaylife.com/forums/viewtopic.php?f=7&t=2036&p=141393#p141393
  2. ↑ Martin Grant (June 5, 2019). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  3. ↑ Adam P. Goucher. "synthesis-costs/xq4 census". Catagolue.
  4. ↑ Overweight spaceship flotillae at Mark D. Niemiec's Life Page
  5. ↑ B3-n4nt5qr6i/S23 (FattyLife) (discussion thread) at the ConwayLife.com forums
  6. ↑ FattyLife (discussion thread) at the ConwayLife.com forums

External links

Retrieved from "https://conwaylife.com/w/index.php?title=Overweight_spaceship&oldid=127368"