Greyship

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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.

External links