Weekender: Difference between revisions
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On December 6, {{year|2020}}, [[winstax]] found a small period-21 tagalong for | On December 6, {{year|2020}}, [[winstax]] found 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. | ||
A [[beehive]] puffer based on this spaceship was found the same day, seemingly independently by [[iNoMed]]<ref name="message785159676852437022" /> and [[GUYTU6J]].<ref name="post114486" /> GUYTU6J also found a [[block]] puffer formed by adding a second weekender to the side of the p21 ship.<ref name="post114486" /> Both of these puffers can be either one- or two-sided. | A [[beehive]] puffer based on this spaceship was found the same day, seemingly independently by [[iNoMed]]<ref name="message785159676852437022" /> and [[GUYTU6J]].<ref name="post114486" /> GUYTU6J also found a [[block]] puffer formed by adding a second weekender to the side of the p21 ship.<ref name="post114486" /> Both of these puffers can be either one- or two-sided. | ||
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==See also== | ==See also== | ||
Revision as of 17:08, 6 December 2020
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| Pattern type | Spaceship | ||||||||||
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| 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, winstax found 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.
A beehive puffer based on this spaceship was found the same day, seemingly independently by iNoMed[6] and GUYTU6J.[7] GUYTU6J also found a block puffer formed by adding a second weekender to the side of the p21 ship.[7] Both of these puffers can be either one- or two-sided.
Goldtiger997 found that the p21 tagalong could be added to the weekender with six gliders,[8][5] while iNoMed found that each side could be turned into a beehive puffer with two gliders.[9][5] Finally, gooddogtyson and Blinkerspawn found that the p21 ship could be converted both to and from a puffer with just one glider each way, on each side.[10][11]
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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
- ↑ 5.0 5.1 5.2 Aidan F. Pierce (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ iNoMed (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
- ↑ 7.0 7.1 GUYTU6J (December 6, 2020). Re: Thread For Your Useless Discoveries (discussion thread) at the ConwayLife.com forums
- ↑ Goldtiger997 (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
- ↑ iNoMed (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
- ↑ gooddogtyson (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
- ↑ Blinkerspawn (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
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
- 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