Difference between revisions of "Weekender"

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{{Spaceship|name=Weekender|pname=weekender|dir=Orthogonal|p=7|s=2c/7|bx=18|by=12|c=36|h=45.1|discoverer=David Eppstein|discoveryear=2000|life105=true|life106=true|plaintext=true|rle=true|synthesis=87|synthesisRLE=true|animated=true}}
{{Spaceship
'''Weekender''' is a [[2c/7 orthogonal]] [[spaceship]] that was found by [[:Category:Patterns found by David Eppstein|David Eppstein]] on January 12, [[:Category:Patterns found in 2000|2000]].<ref>{{CiteSummersPattern|name=jslife}}</ref> On April 27, 2000, [[:Category:Patterns found by Stephen Silver|Stephen Silver]] found a [[tagalong]] for a pair of weekenders (shown below). At present, n weekenders pulling n-1 tagalongs constitute the only known spaceships with [[speed]] 2c/7, besides self-sustaining loops of [[2c/7 orthogonal#Rakes|weekender conduits]]. These were the only known [[:Category:Spaceships_with_period_7|period-7]] spaceships until the discovery of [[lobster (spaceship)|Lobster]] in [[:Category:patterns found in 2011|2011]], [[loafer]] in [[:Category:patterns found in 2013|2013]] and [[702P7H3V0]] in 2016.
|name             = Weekender
|pname           = weekender
|c                = 36
|bx              = 18
|by              = 12
|dir             = Orthogonal
|p               = 7
|m                = 7
|s               = 2c/7
|z                = 2c/7
|h               = 45.1
|discoverer       = David Eppstein
|discoveryear     = 2000
|rulemin          = B3/S23
|rulemax          = B37/S23
|rulespecial      = [[Conway's Game of Life|Conway Life]]
|isorulemin      = B3-ky/S23-c
|isorulemax      = B2n34cqz5ckny6-ik7/S234cekwyz5-aijq6ein7e
|synthesis        = 59
|synthesisRLE    = true
|plaintext       = true
|rle             = true
|animated        = true
|viewerconfig    = #C [[ GPS 7 TRACKLOOP 7 0 -2/7 THUMBSIZE 2 ]]
|apgcode          = xq7_7dfxg88gxfd7zw123u2222u321
|pentadecathlonid = 36P7H2V0.1
|eppsteinid      = 14105
}}
'''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}}.


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).<ref>{{cite web|url=http://www.conwaylife.com/forums/viewtopic.php?f=2&t=1557&start=25#p16223|title=Re: Small Spaceship Syntheses|author=Martin Grant|date=January 25, 2015|accessdate=January 25, 2015}}</ref>
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 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>{{cite web|url=http://conwaylife.com/forums/viewtopic.php?p=23009#p23009|title=
==Tagalongs==
Re: Small Spaceship Syntheses|author=Chris Cain|date=September 26, 2015|accessdate=October 7, 2015}}</ref>
On April 27, 2000, [[Stephen Silver]] found a [[tagalong]] for a pair of weekenders, as shown below.
 
==Image gallery==
{|
{|
|-
|-
|[[Image:weekender_tagalong.png|framed|left|Two weekenders followed by a tagalong<br />{{JavaRLE|weekendertagalong|brief}}]]
|[[Image:weekender_tagalong.png|framed|left|Two weekenders followed by a tagalong<br />{{JavaRLE|weekendertagalong|brief}}]]
|}
|}
On December 6, {{year|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.<ref name="post114481" /><ref name="post114488" /> 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 [[puffer]]s. Garth settled on the name "doo-dah" for the tagalong.<ref name="message785223433708503091" />
Soon after, [[Matthias Merzenich]] discovered that a component from the side of [[186P7H2V0]] can attach to a weekender.<ref name="post114802" />


==See also==
==See also==
Line 17: Line 47:


==References==
==References==
<references/>
<references>
<ref name="post16223">{{LinkForumThread
|p          = 16223
|format    = ref
|title      = Re: Small Spaceship Syntheses
|author    = Martin Grant
|date      = January 25, 2015
}}</ref>
<ref name="post23009">{{LinkForumThread
|p          = 23009
|format    = ref
|title      = Re: Small Spaceship Syntheses
|author    = Chris Cain
|date      = September 26, 2015
}}</ref>
<ref name="post114481">{{LinkForumThread
|format = ref
|title  = Re: Spaceship Discussion Thread
|p      = 114481
|author = yujh
|date  = December 6, 2020
}}</ref>
<ref name="post114488">{{LinkForumThread
|format = ref
|title  = Re: Spaceship Discussion Thread
|p      = 114488
|author = Aidan F. Pierce
|date  = December 6, 2020
}}</ref>
<ref name="message785223433708503091">{{CiteDiscord
|author  = John Winston Garth
|date    = December 6, 2020
|channel = cgol
|id      = 785223433708503091
}}</ref>
<ref name="post114802">{{LinkForumThread
|format = ref
|title  = Re: Spaceship Discussion Thread
|p      = 114802
|author = Matthias Merzenich
|date  = December 8, 2020
}}</ref>
</references>


==External links==
==External links==
*[http://arxiv.org/abs/cs/0004003 Searching for Spaceships] - Eppstein's paper describing the discovery of the weekender
*[http://arxiv.org/abs/cs/0004003 Searching for Spaceships] - Eppstein's paper describing the discovery of the weekender
{{LinkWeisstein|Weekender.html}}
{{LinkLexicon|lex_w.htm#weekender}}
{{LinkLexicon|lex_w.htm#weekender}}
{{LinkEppstein|14105|patternname=The Weekender (glider 14105)}}
{{LinkEppstein|14105|patternname=The Weekender (glider 14105)}}
{{LinkCatagolue|xq7_7dfxg88gxfd7zw123u2222u321}}
{{LinkCatagolue|xq7_7dfxg88gxfd7zw123u2222u321}}
{{LinkPentadecathlonObject|36P7H2V0.1}}


[[Category:Non-monotonic spaceships]]
[[Category:Non-monotonic spaceships]]
{{Symmetry|orthogonal2}}
__NOTOC__

Revision as of 14:53, 14 December 2020

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
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]

Tagalongs

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

Two weekenders followed by a tagalong
RLE: 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.[4][5] 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 settled on the name "doo-dah" for the tagalong.[6]

Soon after, Matthias Merzenich discovered that a component from the side of 186P7H2V0 can attach to a weekender.[7]

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. ↑ yujh (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  5. ↑ Aidan F. Pierce (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  6. ↑ John Winston Garth (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  7. ↑ Matthias Merzenich (December 8, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums

External links


Retrieved from "https://conwaylife.com/w/index.php?title=Weekender&oldid=75795"