According to an article by David Bell, the second 2c/5 spaceship to be found was this:
x = 16, y = 18, rule = B3/S23
Which was apparently discovered by Hartmut Holzwart on December 5, 1992. The only 2c/5 spaceship known before then would then be this one (30P5H2V0). I am mostly looking for confirmation of this so that it can be added to the page.
~Sokwe 03:16, 11 August 2009 (UTC)
- Hrm... I'm not sure what's going on here, but in many of the 1992 e-mails (I don't have e-mails from before then), people refer to the 2c/5 spaceship, indicating that indeed only one was known at that point. However, the only 2c/5 spaceship that is ever posted/mentioned in that year (besides the new one in December) is this one, which Dean confirms is his:
x = 11, y = 15, rule = B3/S23
- Perhaps pentadecathlon.com (the source that said that 30P5H2V0 was found in 1991) is mistaken and got the two spaceship discovery dates mixed up? I'll try to find a reference to 30P5H2V0 in the e-mails to confirm. Nathaniel 03:44, 11 August 2009 (UTC)
- Found it! That spaceship that I just posted is indeed the first that was found (by Hickerson in 1991), the one that you posted was the second one found (in December 1992), and then a whole bunch were found in the following years, and then Paul Tooke found this one (30P5H2V0) on December 7, 2000. He also posted the small example showing how the edges can be extended via other known 2c/5 components:
x = 27, y = 11, rule = S23/B3
- Nathaniel 04:13, 11 August 2009 (UTC)
- Indeed! I just found it in David Bell's articles (that would be these). Thanks for clearing that up.
- Note: the first 2c/5 spaceship was discovered on July 23, 1991.
~Sokwe 04:17, 11 August 2009 (UTC)