Weekender: Difference between revisions
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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 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, {{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" /> | 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" /> | ||
==Tagalongs== | ==Tagalongs== | ||
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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" /> | 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 a | 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== | ||
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|channel = cgol | |channel = cgol | ||
|id = 785223433708503091 | |id = 785223433708503091 | ||
}}</ref> | |||
<ref name="post114802">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Spaceship Discussion Thread | |||
|p = 114802 | |||
|author = Matthias Merzenich | |||
|date = December 8, 2020 | |||
}}</ref> | }}</ref> | ||
</references> | </references> | ||
Revision as of 09:33, 14 December 2020
| Weekender | |||||||||||
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| 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 | ||||||||||
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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.
 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
- ↑ Jason Summers' jslife pattern collection.
- ↑ Martin Grant (January 25, 2015). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
- ↑ Chris Cain (September 26, 2015). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
- ↑ yujh (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Aidan F. Pierce (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ John Winston Garth (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
- ↑ Matthias Merzenich (December 8, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
External links
- Searching for Spaceships - Eppstein's paper describing the discovery of the weekender
- Weekender at the Life Lexicon
- The Weekender (glider 14105) at David Eppstein's Glider Database
- 36P7H2V0.1 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
- Patterns
- Spaceships with 36 cells
- Periodic objects with minimum population 36
- Patterns with 36 cells
- Patterns found by David Eppstein
- Patterns found in 2000
- Patterns that can be constructed with between 50 and 59 gliders
- Spaceships
- Spaceships with period 7
- Orthogonal spaceships
- Spaceships with speed 2c/7
- Spaceships with unsimplified speed 2c/7
- Spaceships with heat 45
- Spaceships with mod 7
- Non-monotonic spaceships
- Patterns with bilateral orthogonal symmetry