Difference between revisions of "2c/7 orthogonal"
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{{Speed|speed=2c/7 orthogonal| | {{Speed | ||
|image = weekender | |||
|speed = 2c/7 orthogonal | |||
|ss = yes | |||
|puff = yes | |||
|rake = yes | |||
|gun = yes | |||
}} | |||
'''2c/7 orthogonal''' is a [[speed]] that is equivalent to two sevenths of the speed of light. | '''2c/7 orthogonal''' is a [[speed]] that is equivalent to two sevenths of the speed of light. | ||
==Spaceships== | ==Spaceships== | ||
The first 2c/7 spaceship discovered was the [[weekender]], which was found by David Eppstein on January 12, | The first 2c/7 spaceship discovered was the [[weekender]], which was found by David Eppstein on January 12, {{year|2000}} using his [[computer search|search program]], [[gfind]]. On April 27, 2000, [[Stephen Silver]] discovered a [[tagalong]] that can be pulled by two weekenders.<ref>{{CiteSummersPattern|name=jslife}}</ref> Attaching these tagalongs to weekenders was the only known method of constructing other 2c/7 spaceships, besides building self-sustaining loops of weekender conduits (see [[#Rakes|Rakes]]). | ||
Another 2c/7 spaceship, the [[scholar]], was found by [[Andrew J. Wade]] on December 30, {{year|2019}}.<ref name="post86724" /> Wade found a third elementary spaceship, [[186P7H2V0]], on March 22, {{year|2020}},<ref name="post92001" /> based on a 2c/7 [[wave]] found by [[Hartmut Holzwart]] on April 30, {{year|2016}}.<ref name="post30505" /> | |||
Holzwart also found a different 2c/7 wave on September 10, {{year|2008}},<ref>{{cite web|url=https://github.com/Matthias-Merzenich/jslife-moving|author=Matthias Merzenich|title=jslife-moving pattern collection|date=April 18, 2018|accessdate=March 22, 2020}}</ref> but as of early 2020, a spaceship stabilization has not been found for it. | |||
==Puffers== | ==Puffers== | ||
On December 26, 2013, Ivan Fomichev built a period-8974 2c/7 puffer by perturbing a [[lightweight spaceship]] with several weekenders.<ref>{{Cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=10169#p10169|title=Re: Weekender Reactions: Building a 2c/7 Puffer|author=Ivan Fomichev|date=December 26, 2013|accessdate=December 27, 2013}}</ref> | On December 26, {{year|2013}}, Ivan Fomichev built a period-8974 2c/7 puffer by perturbing a [[lightweight spaceship]] with several weekenders.<ref>{{Cite web|url=http://www.conwaylife.com/forums/viewtopic.php?p=10169#p10169|title=Re: Weekender Reactions: Building a 2c/7 Puffer|author=Ivan Fomichev|date=December 26, 2013|accessdate=December 27, 2013}}</ref> The next day, he built a smaller period-6622 puffer after Hartmut Holzwart pointed out a simpler design Jason Summers used in [[2c/5_orthogonal#Puffers|his 2c/5 puffer]].<ref name="post10185" /> | ||
===Rakes=== | |||
On May 22, {{year|2014}}, Ivan Fomichev constructed a [[Weekender distaff|period-16982 2c/7 rake]] by synthesising a lightweight spaceship [[seed]] with weekender conduits.<ref>{{Cite web|url=http://conwaylife.com/forums/viewtopic.php?p=12047#p12047|title=Re: Weekender Reactions: Building a 2c/7 Puffer|author=Ivan Fomichev|date=May 22, 2014|accessdate=May 26, 2014}}</ref> | |||
==Guns== | |||
On September 26, {{year|2015}}, [[Chris Cain]] constructed a weekender gun<ref>{{Cite web|url=http://conwaylife.com/forums/viewtopic.php?p=23009#p23009|title=Re: Small Spaceship Syntheses|author=Chris Cain|date=September 26, 2015|accessdate=November 17, 2015}}</ref> based on a 79-glider synthesis. | |||
==Gallery== | |||
{{EmbedViewer | |||
|pname = 2c7waves | |||
|position = center | |||
|caption = 2c/7 [[wave]]s found by [[Hartmut Holzwart]]<br> | |||
|viewerconfig = #C [[ ZOOM 5 ]] | |||
}} | |||
==See also== | ==See also== | ||
*[[:Category:speeds|List of important speeds]] | *[[:Category:speeds|List of important speeds]] | ||
*[[:Category:Spaceships with speed 2c/7|List of spaceships with speed 2c/7]] | |||
*[[:Category:Puffers with speed 2c/7|List of puffers with speed 2c/7]] | |||
==References== | ==References== | ||
<references/> | <references> | ||
<ref name="post10185">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Weekender Reactions: Building a 2c/7 Puffer | |||
|p = 10185 | |||
|author = Ivan Fomichev | |||
|date = December 27, 2013 | |||
}}</ref> | |||
<ref name="post86724">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Spaceship Discussion Thread | |||
|p = 86724 | |||
|author = Andrew J. Wade | |||
|date = December 30, 2019 | |||
}}</ref> | |||
<ref name="post92001">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Spaceship Discussion Thread | |||
|p = 92001 | |||
|author = Andrew J. Wade | |||
|date = March 22, 2020 | |||
}}</ref> | |||
<ref name="post30505">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Incomplete search patterns - try to complete | |||
|p = 30505 | |||
|author = Hartmut Holzwart | |||
|date = April 30, 2016 | |||
}}</ref> | |||
</references> | |||
==External links== | |||
{{LinkLexicon|lex_1.htm#a-2c7spaceship|name=2c/7 spaceship}} | |||
Revision as of 16:51, 22 March 2020
| 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, besides building self-sustaining loops of weekender conduits (see Rakes).
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 early 2020, a spaceship stabilization has not been found for it.
Puffers
On December 26, 2013, Ivan Fomichev built a period-8974 2c/7 puffer by perturbing a lightweight spaceship with several weekenders.[6] 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.[7]
Rakes
On May 22, 2014, Ivan Fomichev constructed a period-16982 2c/7 rake by synthesising a lightweight spaceship seed with weekender conduits.[8]
Guns
On September 26, 2015, Chris Cain constructed a weekender gun[9] 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.
- ↑ 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
- ↑ Ivan Fomichev (May 22, 2014). "Re: Weekender Reactions: Building a 2c/7 Puffer". Retrieved on May 26, 2014.
- ↑ Chris Cain (September 26, 2015). "Re: Small Spaceship Syntheses". Retrieved on November 17, 2015.
External links
- 2c/7 spaceship at the Life Lexicon