Weekender: Difference between revisions

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https://gitlab.com/hatsya/open-source/catagolue/-/jobs/5443374497
synth reduction
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|isorulemin      = B3-ky/S23-c
|isorulemin      = B3-ky/S23-c
|isorulemax      = B2n34cqz5ckny6-ik7/S234cekwyz5-aijq6ein7e
|isorulemax      = B2n34cqz5ckny6-ik7/S234cekwyz5-aijq6ein7e
|synthesis        = 32
|synthesis        = 28
|synthesisRLE    = true
|synthesisRLE    = true
|plaintext        = true
|plaintext        = true
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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.
A {{gliders|32}} synthesis was found in November 2023.<ref name="j5443374497" />
A {{gliders|32}} synthesis was found in November 2023.<ref name="j5443374497" /> On February 9, {{year|2024}}, iNoMed reduced the synthesis to {{gliders|29|text=29 gliders}},<ref name="post177656"/><ref name="j6136674566"/> followed by a reduction to {{gliders|28|text=28 gliders}} by KtT the same day.<ref name="post177663"/><ref name="j6139137922"/>


==Tagalongs==
==Tagalongs==
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<references>
<references>
<ref name="j5443374497">{{CiteCatagolueJob|job=5443374497|date=November 2, 2023}}</ref>
<ref name="j5443374497">{{CiteCatagolueJob|job=5443374497|date=November 2, 2023}}</ref>
<ref name="j6136674566">{{CiteCatagolueJob|job=6136674566|date=February 9, 2024}}</ref>
<ref name="j6139137922">{{CiteCatagolueJob|job=6139137922|date=February 9, 2024}}</ref>
<ref name="message785223433708503091">{{CiteDiscord
<ref name="message785223433708503091">{{CiteDiscord
|author  = John Winston Garth
|author  = John Winston Garth
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|author = Matthias Merzenich
|author = Matthias Merzenich
|date  = March 21, 2021
|date  = March 21, 2021
}}</ref>
<ref name="post177656">{{LinkForumThread
|format = ref
|p      = 177656
|title  = Re: Spaceship Discussion Thread
|author = iNoMed
|date  = February 9, 2024
}}</ref>
<ref name="post177663">{{LinkForumThread
|format = ref
|p      = 177663
|title  = Re: Spaceship Discussion Thread
|author = KtT
|date  = February 9, 2024
}}</ref>
}}</ref>
</references>
</references>

Revision as of 16:33, 9 February 2024

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. A 32-glider synthesis was found in November 2023.[5] On February 9, 2024, iNoMed reduced the synthesis to 29 gliders,[6][7] followed by a reduction to 28 gliders by KtT the same day.[8][9]

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.[10][11] 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.[12]

Soon after, Matthias Merzenich discovered that a component from the side of 186P7H2V0 can attach to a weekender.[13] On March 19, 2021, Merzenich discovered a width-22 symmetric tagalong for a single weekender[14] and proved that this is the only such period-7 symmetric tagalong at that width.[15]

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. ↑ shinjuku (#5443374497) (November 2, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  6. ↑ iNoMed (February 9, 2024). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  7. ↑ shinjuku (#6136674566) (February 9, 2024). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  8. ↑ KtT (February 9, 2024). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  9. ↑ shinjuku (#6139137922) (February 9, 2024). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  10. ↑ Jiahao Yu (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  11. ↑ praosylen (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  12. ↑ John Winston Garth (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  13. ↑ Matthias Merzenich (December 8, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  14. ↑ Matthias Merzenich (March 19, 2021). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  15. ↑ Matthias Merzenich (March 21, 2021). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums


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