Fano database

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Hdjensofjfnen
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Fano database

Post by Hdjensofjfnen » March 4th, 2019, 1:55 am

The Fano database of gliders is in desperate need of updating. There is this 13-cell c/3o, the "cicada", in B3/S01367, that isn't in it.

Code: Select all

x = 7, y = 9, rule = B3/S01367
3bo$3bo$bo$bo2b3o2$3o2$b2o$2bo!
"A man said to the universe:
'Sir, I exist!'
'However,' replied the universe,
'The fact has not created in me
A sense of obligation.'" -Stephen Crane

Code: Select all

x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

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77topaz
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Re: Fano database

Post by 77topaz » March 4th, 2019, 6:58 am

That's far from the only example. The B3/S23 page, for example, doesn't list the loafer or the copperhead. The Fano site hasn't been updated in at least several years, and I think the creator David Eppstein either isn't working with CA anymore or hasn't been contactable by anyone (?).

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Hdjensofjfnen
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Re: Fano database

Post by Hdjensofjfnen » March 6th, 2019, 1:42 am

77topaz wrote:I think the creator David Eppstein either isn't working with CA anymore or hasn't been contactable by anyone (?).
I can contact him via Wikipedia.
"A man said to the universe:
'Sir, I exist!'
'However,' replied the universe,
'The fact has not created in me
A sense of obligation.'" -Stephen Crane

Code: Select all

x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

wildmyron
Posts: 1274
Joined: August 9th, 2013, 12:45 am

Re: Fano database

Post by wildmyron » March 6th, 2019, 3:57 am

Or you could contact him directly: https://www.ics.uci.edu/~eppstein/contact.html

Apparently he still thinks about CA now and then, e.g. https://11011110.github.io/blog/2018/12 ... ntual.html

As far as the glider database goes I don't think that's been updated in quite some time. There are two relevant threads on this board if you are interested in known results:
http://conwaylife.com/forums/viewtopic.php?f=11&t=1787
http://conwaylife.com/forums/viewtopic.php?f=11&t=1074

For the specific rule you mentioned there is already a c/3 known in that rule. Please note comments from the glider db:
gliders.db wrote:# There are far too many gliders known even just in life to just list
# them all (in fact, there are usually infinitely many types of gliders
# whenever there is any). The primary reason for including a glider in
# this list is to cover every known combination of speed and rules.
# Secondarily, I am also including particularly small gliders, or
# gliders that work unchanged in many different rules.
The latest version of the 5S Project contains over 221,000 spaceships. Tabulated pages up to period 160 are available on the LifeWiki.

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Moosey
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Re: Fano database

Post by Moosey » March 6th, 2019, 9:12 am

Would it be possible to add nontotalistic rules to the database?
I guess that would be far too much.
I am a prolific creator of many rather pathetic googological functions

My CA rules can be found here

Also, the tree game
Bill Watterson once wrote: "How do soldiers killing each other solve the world's problems?"

AforAmpere
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Joined: July 1st, 2016, 3:58 pm

Re: Fano database

Post by AforAmpere » March 6th, 2019, 12:08 pm

Moosey wrote:Would it be possible to add nontotalistic rules to the database?
I guess that would be far too much.
I had been working on a user-editable NT glider database, but nobody wanted to add to it. The discussion is here.
I and wildmyron manage the 5S project, which collects all known spaceship speeds in Isotropic Non-totalistic rules.

Things to work on:
- Find a (7,1)c/8 ship in a Non-totalistic rule
- Finish a rule with ships with period >= f_e_0(n) (in progress)

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