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|eppsteinid      = 14105
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'''Weekender''' is a [[2c/7 orthogonal]] [[spaceship]] that was found by [[David Eppstein]] on January 12, {{year|2000}}.<ref>{{CiteSummersPattern|name=jslife}}</ref> Before the discovery of [[scholar]] in {{year|2019}}, n weekenders pulling n-1 tagalongs constituted the only known spaceships with [[speed]] 2c/7, besides self-sustaining loops of [[2c/7 orthogonal#Rakes|weekender conduits]]. These were the only known {{periodS|7}} spaceships until the discovery of [[lobster (spaceship)|lobster]] in {{year|2011}}, [[loafer]] in {{year|2013}} and [[spaghetti monster]] in {{year|2016}}.
'''Weekender''' is a [[2c/7 orthogonal]] [[spaceship]] that was found by [[David Eppstein]] on January 12, {{year|2000}}.<ref>{{CiteSummersPattern|name=jslife}}</ref> Before the discovery of [[scholar]] in {{year|2019}}, ''n'' weekenders pulling {{nowrap|''n'' &minus; 1}} tagalongs constituted the only known spaceships with [[speed]] 2c/7, besides self-sustaining loops of [[2c/7 orthogonal#Rakes|weekender conduits]]. These were the only known {{periodS|7}} spaceships until the discovery of [[lobster (spaceship)|lobster]] in {{year|2011}}, [[loafer]] in {{year|2013}} and [[spaghetti monster]] in {{year|2016}}.


Despite the relative simplicity of its components, a [[glider synthesis]] for the weekender had been elusive since its discovery. A weekender synthesis was completed on January 25, {{year|2015}}, 15 years after its discovery (and coincidentally, on a weekend).<ref name="post16223" /> On September 26, 2015, [[Chris Cain]] announced a p444 weekender gun based on a 79-glider synthesis, as well as a p451/p457+ glider-to-weekender converter.<ref name="post23009" />  On September 6, 2021, [[iNoMed]] produced a 33-glider recipe<ref>[https://discord.com/channels/357922255553953794/370571014654001154/884500442321666131 33-glider recipe]</ref> based on 35- and 34-glider recipes from a week earlier.
Despite the relative simplicity of its components, a [[glider synthesis]] for the weekender had been elusive since its discovery. A weekender synthesis was completed on January 25, {{year|2015}}, 15 years after its discovery (and coincidentally, on a weekend).<ref name="post16223" /> On September 26, 2015, [[Chris Cain]] announced a p444 weekender gun based on a 79-glider synthesis, as well as a p451/p457+ glider-to-weekender converter.<ref name="post23009" />  On September 6, 2021, [[iNoMed]] produced a 33-glider recipe<ref>[https://discord.com/channels/357922255553953794/370571014654001154/884500442321666131 33-glider recipe]</ref> based on 35- and 34-glider recipes from a week earlier.
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{{EmbedViewer
{{EmbedViewer
|pname = 2weekenderswithtagalong
|pname       = 2weekenderswithtagalong
|viewerconfig = #C [[ THUMBSIZE 2 ZOOM 8 ]]
|position    = center
|position    = center
|viewerconfig = #C [[ THUMBSIZE 2 ZOOM 8 ]]
|caption      = Two weekenders followed by a tagalong
|caption      = Two weekenders followed by a tagalong<br />
|style        = width:300px;
}}
}}


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==References==
==References==
<references>
<references>
<ref name="message785223433708503091">{{CiteDiscord
|author  = John Winston Garth
|date    = December 6, 2020
|channel = cgol
|id      = 785223433708503091
}}</ref>
<ref name="post16223">{{LinkForumThread
<ref name="post16223">{{LinkForumThread
|p          = 16223
|format = ref
|format    = ref
|p      = 16223
|title     = Re: Small Spaceship Syntheses
|title = Re: Small Spaceship Syntheses
|author     = Martin Grant
|author = Martin Grant
|date       = January 25, 2015
|date   = January 25, 2015
}}</ref>
}}</ref>
<ref name="post23009">{{LinkForumThread
<ref name="post23009">{{LinkForumThread
|p          = 23009
|format = ref
|format    = ref
|p      = 23009
|title     = Re: Small Spaceship Syntheses
|title = Re: Small Spaceship Syntheses
|author     = Chris Cain
|author = Chris Cain
|date       = September 26, 2015
|date   = September 26, 2015
}}</ref>
}}</ref>
<ref name="post114481">{{LinkForumThread
<ref name="post114481">{{LinkForumThread
|format = ref
|format = ref
|p      = 114481
|title  = Re: Spaceship Discussion Thread
|title  = Re: Spaceship Discussion Thread
|p      = 114481
|author = Jiahao Yu
|author = Jiahao Yu
|date  = December 6, 2020
|date  = December 6, 2020
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<ref name="post114488">{{LinkForumThread
<ref name="post114488">{{LinkForumThread
|format = ref
|format = ref
|p      = 114488
|title  = Re: Spaceship Discussion Thread
|title  = Re: Spaceship Discussion Thread
|p      = 114488
|author = praosylen
|author = praosylen
|date  = December 6, 2020
|date  = December 6, 2020
}}</ref>
<ref name="message785223433708503091">{{CiteDiscord
|author  = John Winston Garth
|date    = December 6, 2020
|channel = cgol
|id      = 785223433708503091
}}</ref>
}}</ref>
<ref name="post114802">{{LinkForumThread
<ref name="post114802">{{LinkForumThread
|format = ref
|format = ref
|p      = 114802
|title  = Re: Spaceship Discussion Thread
|title  = Re: Spaceship Discussion Thread
|p      = 114802
|author = Matthias Merzenich
|author = Matthias Merzenich
|date  = December 8, 2020
|date  = December 8, 2020
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<ref name="post126154">{{LinkForumThread
<ref name="post126154">{{LinkForumThread
|format = ref
|format = ref
|p      = 126154
|title  = Re: Spaceship Discussion Thread
|title  = Re: Spaceship Discussion Thread
|p      = 126154
|author = Matthias Merzenich
|author = Matthias Merzenich
|date  = March 19, 2021
|date  = March 19, 2021
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<ref name="post126432">{{LinkForumThread
<ref name="post126432">{{LinkForumThread
|format = ref
|format = ref
|p      = 126432
|title  = Re: Spaceship Discussion Thread
|title  = Re: Spaceship Discussion Thread
|p      = 126432
|author = Matthias Merzenich
|author = Matthias Merzenich
|date  = March 21, 2021
|date  = March 21, 2021

Revision as of 00:17, 18 May 2023

Weekender
#N Weekender #O David Eppstein #C An orthogonal period 7 spaceship with speed 2c/7. #C www.conwaylife.com/wiki/Weekender x = 16, y = 11, rule = B3/S23 bo12bo$bo12bo$obo10bobo$bo12bo$bo12bo$2bo3b4o3bo$6b4o$2b4o4b4o2$4bo6bo $5b2o2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 7 TRACKLOOP 7 0 -2/7 THUMBSIZE 2 ]]
View animated image
View static image
Pattern type Spaceship
Number of cells 36
Bounding box 18 × 12
Direction Orthogonal
Period 7 (mod: 7)
Speed 2c/7 | 2c/7
Heat 45.1
Kinetic symmetry Unspecified
Discovered by David Eppstein
Year of discovery 2000

Weekender is a 2c/7 orthogonal spaceship that was found by David Eppstein on January 12, 2000.[1] Before the discovery of scholar in 2019, n weekenders pulling n − 1 tagalongs constituted the only known spaceships with speed 2c/7, besides self-sustaining loops of weekender conduits. These were the only known period-7 spaceships until the discovery of lobster in 2011, loafer in 2013 and spaghetti monster in 2016.

Despite the relative simplicity of its components, a glider synthesis for the weekender had been elusive since its discovery. A weekender synthesis was completed on January 25, 2015, 15 years after its discovery (and coincidentally, on a weekend).[2] On September 26, 2015, Chris Cain announced a p444 weekender gun based on a 79-glider synthesis, as well as a p451/p457+ glider-to-weekender converter.[3] On September 6, 2021, iNoMed produced a 33-glider recipe[4] based on 35- and 34-glider recipes from a week earlier.

Tagalongs

On April 27, 2000, Stephen Silver found a tagalong for a pair of weekenders, as shown below.

x = 37, y = 24, rule = B3/S23 bo12bo7bo12bo$bo12bo7bo12bo$obo10bobo5bobo10bobo$bo12bo7bo12bo$bo12bo 7bo12bo$2bo3b4o3bo9bo3b4o3bo$6b4o8bo8b4o$2b4o4b4o2b5o2b4o4b4o$15bobobo bo$4bo6bo13bo6bo$5b2o2b2o6bobo6b2o2b2o$14bo2bobo2bo$14bo2bobo2bo$14bob o3bobo3$14b2o5b2o$14b2o5b2o2$16b2ob2o$15bobobobo$15bobobobo$17bobo$15b 2o3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 8 ]]
Two weekenders followed by a tagalong
(click above to open LifeViewer)
RLE: here Plaintext: here

On December 6, 2020, John Winston Garth found doo-dah, a small period-21 tagalong for a single weekender, which in its simplest phase consists entirely of two R-pentomino descendants.[5][6] The spaceship was found using a combination of ikpx2 and apgsearch, with partial results from the former being inputted into the latter via ikpx2's "standard input" feature, with the goal of searching higher-period spaceships and puffers. Garth chose the name "doo-dah" for the tagalong.[7]

Soon after, Matthias Merzenich discovered that a component from the side of 186P7H2V0 can attach to a weekender.[8] On March 19, 2021, Merzenich discovered a width-22 symmetric tagalong for a single weekender[9] and proved that this is the only such period-7 symmetric tagalong at that width.[10]

See also

References

  1. ↑ Jason Summers' jslife pattern collection.
  2. ↑ Martin Grant (January 25, 2015). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  3. ↑ Chris Cain (September 26, 2015). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  4. ↑ 33-glider recipe
  5. ↑ Jiahao Yu (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  6. ↑ praosylen (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  7. ↑ John Winston Garth (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  8. ↑ Matthias Merzenich (December 8, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  9. ↑ Matthias Merzenich (March 19, 2021). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  10. ↑ Matthias Merzenich (March 21, 2021). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums


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