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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.
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 [[: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=February 24, 2018}}</ref><ref>{{cite web|url=http://pentadecathlon.com/lifeNews/2005/09/greyship_update.html|title=Greyship Update|date=September 6, 2005|work=Game of Life News|author=Dave Greene|accessdate=February 24, 2018}}</ref><ref>{{cite web|url=http://b3s23life.blogspot.com/2005/12/holiday-greyships-grey-no-longer.html|title=Holiday Greyships -- Grey No Longer!|date=December 10, 2005|work=Conway's Life: Work in Progress (weblog)|author=Dave Greene|accessdate=February 24, 2018}}</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]].<ref>{{cite web|url=http://pentadecathlon.com/lifeNews/2011/01/first_c5_greyship_and_a_new_c3.html|title=First c/5 greyship, and a new c/3|date=January 10,2011|work=Game of Life News|author=Dave Greene|accessdate=February 24, 2018}}</ref>
The first greyships were found by [[Hartmut Holzwart]] and [[Jason Summers]] in [[: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=February 24, 2018}}</ref><ref>{{cite web|url=http://pentadecathlon.com/lifeNews/2005/09/greyship_update.html|title=Greyship Update|date=September 6, 2005|work=Game of Life News|author=Dave Greene|accessdate=February 24, 2018}}</ref><ref>{{cite web|url=http://b3s23life.blogspot.com/2005/12/holiday-greyships-grey-no-longer.html|title=Holiday Greyships -- Grey No Longer!|date=December 10, 2005|work=Conway's Life: Work in Progress (weblog)|author=Dave Greene|accessdate=February 24, 2018}}</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]].<ref>{{cite web|url=http://pentadecathlon.com/lifeNews/2011/01/first_c5_greyship_and_a_new_c3.html|title=First c/5 greyship, and a new c/3|date=January 10, 2011|work=Game of Life News|author=Dave Greene|accessdate=February 24, 2018}}</ref>


==Types of greyships==
==Types of greyships==

Revision as of 17:33, 14 February 2019

A greyship

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 2005.[1][2][3] These ships traveled orthogonally at c/2. Since then greyships have been found for speeds c/3, c/4, c/5, and 2c/5.[4]

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.[5]

Other than the stripes agar, there are a few known greyships that use the chicken wire agar[6], and some with other types of discontinuity.[7][8] A looser definition of greyship may also include ships with extensible, high-density agars of higher periods.

See also

References

  1. ↑ Dave Greene (July 9, 2005). "c/2 and 2c/4 "greyships"". Game of Life News. Retrieved on February 24, 2018.
  2. ↑ Dave Greene (September 6, 2005). "Greyship Update". Game of Life News. Retrieved on February 24, 2018.
  3. ↑ Dave Greene (December 10, 2005). "Holiday Greyships -- Grey No Longer!". Conway's Life: Work in Progress (weblog). Retrieved on February 24, 2018.
  4. ↑ Dave Greene (January 10, 2011). "First c/5 greyship, and a new c/3". Game of Life News. Retrieved on February 24, 2018.
  5. ↑ Dave Greene (December 16, 2005). "New perpendicular greyships". Game of Life News. Retrieved on February 24, 2018.
  6. ↑ Dave Greene (April 3, 2006). "Chicken-Wire-Agar Greyships". Game of Life News. Retrieved on February 24, 2018.
  7. ↑ Dave Greene (December 16, 2005). "Hybrid greyships (perpendicular and parallel stripes)". Game of Life News. Retrieved on February 24, 2018.
  8. ↑ Dave Greene (December 18, 2005). "Fixed-Width and Slipping-Stripe Greyships". Game of Life News. Retrieved on February 24, 2018.
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