2c/7 orthogonal
| 2c/7 orthogonal | ||
| ||
| Spaceship | Yes | |
|---|---|---|
| Puffer | Yes | |
| Rake | Yes | |
| Wickstretcher | No | |
| Gun | Yes | |
2c/7 orthogonal is a speed that is equivalent to two sevenths of the speed of light.
Spaceships
The first 2c/7 spaceship discovered was the weekender, which was found by David Eppstein on January 12, 2000 using his search program, gfind. On April 27, 2000, Stephen Silver discovered a tagalong that can be pulled by two weekenders.[1] Attaching these tagalongs to weekenders was the only known method of constructing other 2c/7 spaceships until 2013, when self-sustaining loops of weekender conduits (see Rakes) became possible to construct.
Another 2c/7 spaceship, the scholar, was found by Andrew J. Wade on December 30, 2019.[2] Wade found a third elementary spaceship, 186P7H2V0, on March 22, 2020,[3] based on a 2c/7 wave found by Hartmut Holzwart on April 30, 2016.[4]
Holzwart also found a different 2c/7 wave on September 10, 2008,[5] but as of late 2020, a spaceship stabilization has not been found for it.
The first 2c/7 spaceship at an intermediate period was found on December 6, 2020, a period-21 tagalong for the weekender discovered by winstax using ikpx2.[6][7]
Puffers
On December 26, 2013, Ivan Fomichev built a period-8974 2c/7 puffer by perturbing a lightweight spaceship with several weekenders.[8] The next day, he built a smaller period-6622 puffer after Hartmut Holzwart pointed out a simpler design Jason Summers used in his 2c/5 puffer.[9]
Since December 2020 a family of smaller puffers have been possible by perturbing the p21 weekender tagalong with varying combinations of additional weekenders and modified copies of 186P7H2V0.[10][7]
Rakes
On May 22, 2014, Ivan Fomichev constructed a period-16982 2c/7 rake by synthesising a lightweight spaceship seed with weekender conduits.[11]
Since December 2020 far smaller and faster rakes have become possible based on the p21 weekender tagalong; in particular, smaller period-105 forward glider rakes have been constructed by iNoMed and Adam P. Goucher.[12]
Guns
On September 26, 2015, Chris Cain constructed a weekender gun[13] based on a 79-glider synthesis.
Gallery
| 2c/7 waves found by Hartmut Holzwart (click above to open LifeViewer) RLE: here Plaintext: here |
See also
References
- ↑ Jason Summers' jslife pattern collection.
- ↑ Andrew J. Wade (December 30, 2019). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Andrew J. Wade (March 22, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Hartmut Holzwart (April 30, 2016). Re: Incomplete search patterns - try to complete (discussion thread) at the ConwayLife.com forums
- ↑ Matthias Merzenich (April 18, 2018). "jslife-moving pattern collection". Retrieved on March 22, 2020.
- ↑ yujh (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ 7.0 7.1 Aidan F. Pierce (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Ivan Fomichev (December 26, 2013). "Re: Weekender Reactions: Building a 2c/7 Puffer". Retrieved on December 27, 2013.
- ↑ Ivan Fomichev (December 27, 2013). Re: Weekender Reactions: Building a 2c/7 Puffer (discussion thread) at the ConwayLife.com forums
- ↑ GUYTU6J (December 6, 2020). Re: Thread For Your Useless Discoveries (discussion thread) at the ConwayLife.com forums
- ↑ Ivan Fomichev (May 22, 2014). "Re: Weekender Reactions: Building a 2c/7 Puffer". Retrieved on May 26, 2014.
- ↑ Aidan F. Pierce (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Chris Cain (September 26, 2015). "Re: Small Spaceship Syntheses". Retrieved on November 17, 2015.
External links
- 2c/7 spaceship at the Life Lexicon
