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> | '''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 | 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 | ==Tagalongs== | ||
On April 27, 2000, [[Stephen Silver]] found a [[tagalong]] for a pair of weekenders, as shown below. On December 5, {{year|2020}}, winston found another tagalong with period 21 consisting of two [[R-pentomino]]es. [[Goldtiger997]] soon found a 6-glider recipe that adds the tagalong to a weekender. | |||
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==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> | |||
</references> | |||
==External links== | ==External links== | ||
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[[Category:Non-monotonic spaceships]] | [[Category:Non-monotonic spaceships]] | ||
{{Symmetry|orthogonal2}} | {{Symmetry|orthogonal2}} | ||
__NOTOC__ | |||
Revision as of 16:20, 6 December 2020
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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. On December 5, 2020, winston found another tagalong with period 21 consisting of two R-pentominoes. Goldtiger997 soon found a 6-glider recipe that adds the tagalong to a weekender.
 RLE: here |
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
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