Greyship: Difference between revisions
New page: A spaceship which contains a region of density 1/2, and which is extensible such that this region can be made larger than any given square region. |
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A spaceship which contains a region of density 1/2, and which | [[Image:Greyship2_H_Holzwart.png|framed|right|A greyship]] | ||
A '''greyship''' is a [[spaceship]] which contains a region of density 1/2 (generally the [[zebra stripes|stripes agar]]) that can be extended to an arbitrary size both horizontally and vertically. | |||
The first greyships were found by [[Hartmut Holzwart]] and [[Jason Summers]] in early July [[:Category:patterns found in 2005|2005]].<ref>{{cite web|url=http://pentadecathlon.com/lifeNews/2005/07/c2_and_2c4_greyships.html|title=c/2 and 2c/4 "greyships"|date=July 9, 2005|work=Game of Life News|author=Dave Greene|accessdate=January 10, 2011}}</ref> These ships traveled orthogonally at [[c/2 orthogonal|c/2]]. Since then greyships have been found for speeds [[c/3 orthogonal|c/3]], [[c/4 orthogonal|c/4]], [[c/5 orthogonal|c/5]], and [[2c/5 orthogonal|2c/5]]. | |||
==Types of greyships== | |||
Most known greyship components use the stripes agar and travel with-the-grain (parallel to the stripes); There are some known '''against-the-grain''' greyships, in which the stripes are perpendicular to the direction of travel; however, these are only known for a speed of c/2. | |||
Other than the stripes agar, there are a few known greyships that use the [[chicken wire]] agar. A looser definition of greyship may also include ships with extensible, high-density agars of higher periods. | |||
==See also== | |||
[[Types of spaceships]] | |||
==References== | |||
<references/> | |||
Revision as of 01:14, 11 January 2011
A greyship is a spaceship which contains a region of density 1/2 (generally the stripes agar) that can be extended to an arbitrary size both horizontally and vertically.
The first greyships were found by Hartmut Holzwart and Jason Summers in early July 2005.[1] These ships traveled orthogonally at c/2. Since then greyships have been found for speeds c/3, c/4, c/5, and 2c/5.
Types of greyships
Most known greyship components use the stripes agar and travel with-the-grain (parallel to the stripes); There are some known against-the-grain greyships, in which the stripes are perpendicular to the direction of travel; however, these are only known for a speed of c/2.
Other than the stripes agar, there are a few known greyships that use the chicken wire agar. A looser definition of greyship may also include ships with extensible, high-density agars of higher periods.
See also
References
- ↑ Dave Greene (July 9, 2005). "c/2 and 2c/4 "greyships"". Game of Life News. Retrieved on January 10, 2011.