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|bx          = 14
|bx          = 14
|by          = 14
|by          = 14
|symmetry    = /
|discoverer  = David Buckingham
|discoverer  = David Buckingham
|discoveryear = 1971
|rulemin      = B/S23
|rulemin      = B/S23
|rulemax      = B378/S012345678
|rulemax      = B378/S012345678
|rulespecial  = [[Conway's Game of Life|Conway Life]]
|isorulemin  = B/S2-cn3knry
|isorulemin  = B/S2-cn3knry
|isorulemax  = B2-ae34-antw5-kqry6-k78/S012345678
|isorulemax  = B2-ae34-antw5-kqry6-k78/S012345678
|synthesis    = 14
|synthesis    = 12
|synthesisRLE = true
|synthesisRLE = true
|plaintext    = true
|plaintext    = true
|rle          = true
|rle          = true
|viewerconfig = #C [[ HEIGHT 480 WIDTH 480 THUMBSIZE 2 ]]
|viewerconfig = #C [[ HEIGHT 600 WIDTH 600 THUMBSIZE 3 ZOOM 30 ]]
|apgcode      = xs40_y2g8o6pb8oz0ggcaa9o74z320f9
|apgcode      = xs40_y2g8o6pb8oz0ggcaa9o74z320f9
}}
}}
'''Eater 4''' is an [[eater]] that was found by [[David Buckingham]] in {{year|1971}}, but was not recognized as an eater until 1975 or 1976. It can't eat [[glider]]s, but it can be used for various other purposes.{{which}} The four northeast-most center cells regrow in a few generations after being destroyed by taking a bite out of something.
'''Eater 4''' is a {{slcells|40|text=40-cell}} [[still life]] [[catalyst]] allegedly found by [[David Buckingham]].<ref>{{CiteHickersonOscillators|accessdate=May 28, 2022}}</ref>


On January 7, {{year|2020}}, [[Jeremy Tan]] found a {{gliders|14}} [[synthesis]] of this still life.<ref name="post87094" />
Despite its name being in a series of [[eater]]s, this still life cannot eat [[glider]]s in regular [[Life]]. As it is diagonally symmetric, it can only perturb symmetric reactions; the four northeast-most center cells regrow in a few generations after being destroyed by taking a bite out of something.
Examples of its use include the pre-pulsar hassler in [[p29 pentadecathlon hassler]], the p30 [[honey farm hassler]] shown below, the [[L122]] [[Herschel conduit]], and a [[Lumps_of_muck_hasslers#p9|p9 LOM hassler]]. <br>
For details of its catalyses, see [[Tutorials/Catalyses#Eater_4]].


==See also==
{{gallery top}}
*[[Eater 1]]
{{gallery item|{{EmbedViewer
*[[Eater 2]]
|pname        = p30honeyfarmhassler1
*[[Eater 3]]
|viewerconfig = #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 18 GPS 6 AUTOSTART ]]
*[[Eater 5]]
|position    = center
|caption      = p30 honey farm hassler found by [[Dongook Lee]] on January 3, {{year|2016}}
|style        = width:300px;
|apgcode      = xp30_y2g8o6pb8oz0ggcaa9o74y4g0s4z320f9y26fhcx11zzy3oomewcczy4cc
}}}}
{{gallery item|{{EmbedViewer
|rle = x = 15, y = 15, rule = B3/S23
2bo$bobo$obobo$o3bo$b3ob2o$3bobobo$5bobo$5bo2b2o$4b2o4bo$6b5o$6bo4b2o
$9b2o2bo$10bobobo$10bo2bo$11b2o!
|viewerconfig = #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 18 ]]
|position    = center
|caption      = Variant of eater 4 [[weld]]ed with [[honeycombinator]]s with a higher side [[clearance]].
|style        = width:300px;
|apgcode      = xs42_cilicggzx18fgjkkozy21w2ehla4
}}}}
{{Gallery item|{{EmbedViewer
|rle          = x = 26, y = 29, rule = B3/S23
11bo$10bobo$9bobobo$9bo3bo$7b2ob3o$6bobobo$6bobo6b2o$4b2obo8bo$3bo2bo$
3b3o$b2o$o2b2o$2obo7b3o$3bo7b2o$3b2o6b4o6b2o$13b2o7bo$12b3o7bob2o$21b
2o2bo$23b2o$20b3o$19bo2bo$9bo8bob2o$9b2o6bobo$15bobobo$13b3ob2o$12bo3b
o$12bobobo$13bobo$14bo!
|viewerconfig = #C [[ HEIGHT 500 WIDTH 600 THUMBLAUNCH THUMBSIZE 2 THEME Book ZOOM 12 GPS 9 STARTFROM 18 ]]
|position    = center
|caption      = [[Period-18 R-pentomino hasslers|Period-18 R-Pentomino hassler]] that uses an unusually long interaction.
|style        = width:300px;
|apgcode      = xp18_y8cilicggzy562y01034bkkozxggy2gkssy2iu156z6a8nkgy1332zx122dis0oggw46zy534a43
}}}}
{{gallery bottom}}
On January 7, {{year|2020}}, [[Jeremy Tan]] found a {{gliders|14}} [[Glider synthesis|synthesis]] of this still life.<ref name="post87094" /> On November 4, {{year|2022}}, [[GUYTU6J]] reduced the cost to 12 gliders and also found syntheses for other variants.<ref name="post153084" />


==References==
== See also ==
* [[Fishhook|Eater 1]]
* [[Eater 2]]
* [[Eater 3]]
* [[Eater 5]]
* [[Tutorials/Catalyses#Eater_4|Eater 4 catalyses]]
 
== References ==
<references>
<references>
<ref name="post87094">{{LinkForumThread
<ref name="post87094">{{LinkForumThread
Line 38: Line 74:
|author = Jeremy Tan
|author = Jeremy Tan
|date  = January 7, 2020
|date  = January 7, 2020
}}</ref>
<ref name="post153084">{{LinkForumThread
|format = ref
|title  = Re: Still Life Synthesis Thread
|p      = 153084
|author = GUYTU6J
|date  = November 4, 2022
}}</ref>
}}</ref>
</references>
</references>


==External links==
== External links ==
{{LinkWeisstein|filename=Eater4.html}}
* {{LinkLexicon|filename=lex_e.htm#eater4}}
{{LinkLexicon|filename=lex_e.htm#eater4}}
* {{LinkCatagolue|xs40_y2g8o6pb8oz0ggcaa9o74z320f9}}
{{LinkCatagolue|xs40_y2g8o6pb8oz0ggcaa9o74z320f9}}


{{Symmetry|diagonal2}}
{{seminatural}}
{{seminatural}}
[[Category:Catalysts]]

Latest revision as of 04:57, 6 November 2024

Eater 4
2b2o$2bobo$4bo$4ob2o$o2bobobo$5bobo$5bo2b2o$4b2o4bo$6b5o$6bo4b2o$9b2o2bo$10bob2o$10bo$9b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] #C [[ HEIGHT 600 WIDTH 600 THUMBSIZE 3 ZOOM 30 ]]
View static image
Pattern type Strict still life
Eater
Number of cells 40
Bounding box 14 × 14
Static symmetry / (D2_x)
Discovered by David Buckingham
Year of discovery Unknown

Eater 4 is a 40-cell still life catalyst allegedly found by David Buckingham.[1]

Despite its name being in a series of eaters, this still life cannot eat gliders in regular Life. As it is diagonally symmetric, it can only perturb symmetric reactions; the four northeast-most center cells regrow in a few generations after being destroyed by taking a bite out of something. Examples of its use include the pre-pulsar hassler in p29 pentadecathlon hassler, the p30 honey farm hassler shown below, the L122 Herschel conduit, and a p9 LOM hassler.
For details of its catalyses, see Tutorials/Catalyses#Eater_4.


x = 29, y = 22, rule = B3/S23 17b2o$17bobo$19bo$15b4ob2o$15bo2bobobo$20bobo$20bo2b2o$4bo14b2o4bo$4ob o15b5o$3obobo14bo4b2o$5bobo16b2o2bo$6bo18bob2o$5b2o7b2ob3o5bo$5b2o7b2o 8b2o$5b2o4$18b2o$18bo$19b3o$21bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 18 GPS 6 AUTOSTART ]]
p30 honey farm hassler found by Dongook Lee on January 3, 2016
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagolue: here
x = 15, y = 15, rule = B3/S23 2bo$bobo$obobo$o3bo$b3ob2o$3bobobo$5bobo$5bo2b2o$4b2o4bo$6b5o$6bo4b2o $9b2o2bo$10bobobo$10bo2bo$11b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 18 ]]
Variant of eater 4 welded with honeycombinators with a higher side clearance.
(click above to open LifeViewer)
Catagolue: here
x = 26, y = 29, rule = B3/S23 11bo$10bobo$9bobobo$9bo3bo$7b2ob3o$6bobobo$6bobo6b2o$4b2obo8bo$3bo2bo$ 3b3o$b2o$o2b2o$2obo7b3o$3bo7b2o$3b2o6b4o6b2o$13b2o7bo$12b3o7bob2o$21b 2o2bo$23b2o$20b3o$19bo2bo$9bo8bob2o$9b2o6bobo$15bobobo$13b3ob2o$12bo3b o$12bobobo$13bobo$14bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 WIDTH 600 THUMBLAUNCH THUMBSIZE 2 THEME Book ZOOM 12 GPS 9 STARTFROM 18 ]]
Period-18 R-Pentomino hassler that uses an unusually long interaction.
(click above to open LifeViewer)
Catagolue: here

On January 7, 2020, Jeremy Tan found a 14-glider synthesis of this still life.[2] On November 4, 2022, GUYTU6J reduced the cost to 12 gliders and also found syntheses for other variants.[3]

See also

References

  1. ↑ Dean Hickerson's oscillator stamp collection. Retrieved on May 28, 2022.
  2. ↑ Jeremy Tan (January 7, 2020). Re: Soup-based syntheses (discussion thread) at the ConwayLife.com forums
  3. ↑ GUYTU6J (November 4, 2022). Re: Still Life Synthesis Thread (discussion thread) at the ConwayLife.com forums
Retrieved from "https://conwaylife.com/w/index.php?title=Eater_4&oldid=156747"