LifeWiki Did-You-Knows

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Re: LifeWiki Did-You-Knows

Post by dvgrn » March 2nd, 2015, 11:49 pm

dvgrn wrote:That brings the recipe down within spitting distance of 175K gliders -- 175172 to be precise (if not necessarily exact).
This evening I patched up the Gemini recipe, due to being too tired to do anything else. Ended up with 175183 gliders when I was done, so it's not exactly clear what was wrong with my math yesterday... Haven't re-tested since the final fix, but I think this is a working glider synthesis:

EDIT: All right, 175167 gliders, with plenty of potential for further reductions but it's not going to be me doing any more arbitrary silly patching.... The Gemini builds its initial elbow blocks in a convoluted way to avoid having to move its construction arms long distances, but there was no need for the initial construction to do it that way.
gemini-175167-glider-synthesis.mc.gz
175167 gliders -> Gemini spaceship
(1.06 MiB) Downloaded 763 times
[Just by the way, this nonstandard way that the three elbow blocks are created makes it a little tricky to build guns for the original Gemini spaceship. In point of fact, a true Gemini gun has never been built: all the known "Gemini guns" really build Geminoid spaceships with exactly the same circuitry but slightly longer recipe glider streams.]

Thanks for the really elegant idea, Chris. Destructor-arm suppression in a mere 14 gliders made the problem into an insurmountable opportunity.

EDIT: Notice that the synthesis can easily be simulated at a step size of 2^20 or above for a good fraction of the construction, but then Golly slows to a relative crawl after 64 million ticks thanks to the opposing glider streams, and seems to be most efficient at step sizes between 2^12 and 2^15 from then on.

You know that Escher print where a dragon sticks its head through little folded gaps in the paper it's drawn on? I keep getting that image stuck in my head, as an illustration of a way that Golly could simulate the Gemini and other similar boustrophedonic-glider devices, at really breakneck speed. There would just have to be a way to define hashtile adjacency in a very nonstandard way just in a few key locations near each replicator unit, such that all of the gliders heading southeast get stored on completely separate hashtiles from all of the gliders heading northwest.

If I had a few years of free time, I'd be tempted to attempt a generalization of Golly's Hashlife algorithm along these lines -- along with proper support for bounded grids and infinite non-empty universes (where the default tile is something other than vacuum). And efficient Hashlife representations of non-2^N spatial periodicity: arrange to leave off rows and/or columns of certain sized hashtiles, to get say 63x63 periodicity instead of 64x64.

Luckily I think I'm safe: too much else to think about in Real Life these days...!

EDIT on Talk Like A Pirate Day 2019: Arrrr, shiver me timbers, calcyman implemented something like the above idea last year, for simulating the 0E0P metacell. It's called StreamLife.

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Re: LifeWiki Did-You-Knows

Post by triller » March 4th, 2015, 8:49 pm

dvgrn wrote:.....boustrophedonic-glider devices .....
Winner! Most apt reference.
Excellent word, too.
triller
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Re: LifeWiki Did-You-Knows

Post by dvgrn » June 11th, 2015, 2:28 pm

The LifeWiki now has over fifty did-you-know entries, up from the original twenty, including pretty much every item from the first post in this thread. Corrections and update suggestions are welcome as usual.

There's no particular hurry, but my original goal was more like 100 did-you-know items.

I can probably come up with another dozen or two, along the lines of "did you know that a pattern that does such-and-such was constructed by so-and-so in 19xx/20xx?" There are quite a lot of impressive constructions from the past couple of decades that are still relatively little-known, and usually not mentioned on the LifeWiki yet.

What other possible did-you-know categories am I not thinking of? E.g., what have you found out about Conway's Life recently, where you thought, "Huh -- I didn't know that!" ...?

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Re: LifeWiki Did-You-Knows

Post by Alexey_Nigin » June 11th, 2015, 4:57 pm

LifeWiki wrote:... that glider constructions for the weekender, B29, 30P5H2V0, and 58P5H1V1 spaceships were discovered in 2015?
I have never seen a synthesis of 58P5H1V1.
There are 10 types of people in the world: those who understand binary and those who don't.

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Re: LifeWiki Did-You-Knows

Post by dvgrn » June 11th, 2015, 7:21 pm

Alexey_Nigin wrote:
LifeWiki wrote:... that glider constructions for the weekender, B29, 30P5H2V0, and 58P5H1V1 spaceships were discovered in 2015?
I have never seen a synthesis of 58P5H1V1.
Thanks, I'll fix that -- I see where I misread some partial results in Small Spaceship Syntheses thread, and got the wrong P5 on my list.

Before I go and make the change on the LifeWiki -- did I miss any other new-in-2015 spaceship syntheses? Seems as if there were a few more... Of course there may be more by the end of 2015, but we can cross that bridge later if we come to it.

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Re: LifeWiki Did-You-Knows

Post by Extrementhusiast » June 12th, 2015, 2:39 pm

dvgrn wrote:Before I go and make the change on the LifeWiki -- did I miss any other new-in-2015 spaceship syntheses? Seems as if there were a few more...
Well, there were syntheses for 25P3H1V0.2, X66 (along with half of it escorted by a HWSS), and a partial for pushalong 1 (which I think I'll try to finish right now, if I didn't already).

EDIT: I did already; I just forgot to post it:

Code: Select all

x = 592, y = 47, rule = B3/S23
116bo$115bo$115b3o9bo$112bo14bobo399bo15bo$113b2o12b2o401b2o14bo$112b
2o415b2o13b3o$172bo$22bo94bo7bo45bo350bo$21bo94bo8bobo43b3o346bobo25bo
3bo$21b3o92b3o6b2o21bobo26bo14bo328b2o23bobob2o5bobo$19bo128b2o18bobo
6bobo13bo353b2o2b2o4b2o$20bo62bobo63bo19b2o6b2o12b3o7bo3b3o24bo119bo
205bo$18b3o58bo3b2o84bo32b2obo26bobo29bo88b2o$23bo28bobo25b2o2bo65b2o
49b2o3bo25b2o30bobo28b2o55b2o24bo$22bo29b2o25b2o68b2o22b2o89b2o23bobo
3bobo29bo50bobo145bo$22b3o28bo45b4o18b2o28bo22bo21b2o92b2o3bo30bo51b2o
22bo22bo23bo23bo26bo26bo5bo$45b2o24b2o25bo3bo11b2o4bobo18b2o3b2o19b2o
4bo17b2o4bo5b2o16b2o5bo23b2o25b2o9bo16b2o17b3o15b2o12bo16b2o5b2o17bobo
b2o17bobob2o18bobob2o18bobob2o21bobob2o20b3o4bobob2o$30bo14bobo6b2o15b
obo3b2o23bo11bobo3bo20bo5bo19bo4bo18bo4bo6bobo15bo4b3o23bo4b2obo18bo4b
2o21bo4b2o2b2o26bo4b2o2b2o2bobo16b2o4bo4b2o13b2obo4b2o13b2obo4b2o14b2o
bo4b2o14b2obo4b2o17b2obo4b2o23b2obo4b2o$2bo25b2o17bo6bobo16bo4bo19bo2b
o14bo4bo21bobo23bobo21bobo7bo19bobo28bobo2b2o20bobo2bobo20bobo2bo2bo
28bobo2bo2bo3b2o4bo10bo8bobo2bo17bobo2bo17bobo2bo18bobo2bo18bobo2bo21b
obo2bo27bobo2bo$obo20b2o4b2o15b2ob2o3bo17b2ob3o37b2ob3o21b2ob2o21b2ob
2o19b2ob2o25b2ob2o26b2ob2o22b2ob2o2b2o19b2ob2o2b2o10b3o15b2ob2o2b2o8b
2o19b2ob2obo16b2ob2obo16b2ob2obo17b2ob2obo17b2ob2obo20b2ob2obo26b2ob2o
bo$b2ob3o15bo2bo20bo2bo22bo2bo39bo2bo23bo2bo22bo2bo20bo2bo26bo2bo4b2o
21bo2bo23bo2bo24bo2bo15bo17bo2bo14b2o12b3o3bo2bo2bob2o13bo2bo2bob2o13b
o2bo2bob2o14bo2bo2bob2o14bo2bo2bob2o17bo2bo2bob2o23bo2bo2bob2o$4bo18bo
bo6b3o12bobo23bobo40bobo24bobo23bobo21bobo27bobo5b2o21bobo5b2o17bobo
10b2o13bobo16bo3b3o11bobo9b3o16bo6bobo2bo2bo14bobo2bo2bo14bobo2bo2bo
15bobo2bo2bo15bobo2bo2bo18bobo2bo2bo24bobo2bo2bo$5bo18bo7bo15bo25bo42b
o26bo25bo23bo29bo5bo3b2o19bo7b2o17bo7bo2b2o15bo21bo14bo10bo19bo6bo4b2o
16bo4b2o16bo4b2o17bo4b2o17bo4b2o20bo4b2o26bo4b2o$33bo199b2o27bo3b2o22b
2o3bo37bo16b3o6bo$127b2o106bo29b2o22bobo60bo103bo$126b2o101bo37bo83bo
103bobo22b2ob2o6bo15b2ob2o28b2ob2o$128bo100b2o30bo92b3o99bo22bobobobo
3b2o17bobo30bobo$228bobo30b2o91bo106b2o17bo3bo5b2o16bobo30bobo$260bobo
92bo98b2o5bobo36bobo6bo24b3o5bo$351b3o81b2o17bobo4bo24bobo12b2o$353bo
76b2o2b2o18bo26bo4b2o13bo$352bo54b2o20bo2bo3bo43b2o5bo69bo$402b3ob2o
21bo2bo47bobo18b2o53b2o$404bo3bo21b2o56b2o12b2o52bobo$403bo83b2o12bo$
489bo$554b2o31b3o$553b2o32bo2bo$525b3o2b2o23bo29bo$527bo3b2o25b3o26bo
3bo$526bo3bo5b2o20bo25bo3b3o$537b2o20bo21bo3b2o$536bo43b3o2b2o$580bob
2o$581b3o$581b3o$581b2o!
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Re: LifeWiki Did-You-Knows

Post by dvgrn » June 12th, 2015, 4:47 pm

Extrementhusiast wrote:Well, there were syntheses for 25P3H1V0.2, X66 (along with half of it escorted by a HWSS), and a partial for pushalong 1 (which I think I'll try to finish right now, if I didn't already). EDIT: I did already; I just forgot to post it...
Thanks! Fixed now, I think. Those first three spaceships were in the Did-You-Know entry for the wrong year, for some reason. Were there "only" three new spaceship syntheses in 2014, then, or have I forgotten a few there too?

The 77-glider-I-believe synthesis of Pushalong 1 is up on the LifeWiki now.

I don't see a complete incremental synthesis of 25P3H1V0.2 anywhere -- has someone completed one? The partial syntheses I can find make me guess that the total is 62 gliders, but that may not be quite right:

Code: Select all

#N 25p3h1v0.2_synth.rle
#O Martin Grant
#C 62-glider synthesis for 25P3H1V0.2 discovered January 6, 2015.
#C All steps are not shown, and reductions may be possible.
#C http://www.conwaylife.com/forums/viewtopic.php?f=2&t=1557&p=15747#p15747
#C http://conwaylife.com/wiki/25P3H1V0.2
x = 198, y = 80, rule = B3/S23
35bo$34bo$34b3o36bobo$69bo3b2o$31bo38b2o2bo$29bobo37b2o$30b2o$67bo$65b
obo34bo$30bo22b2o11b2o5b2o15bo2b2o8bo6bo2b2o15bo2b2o$30b2o6b2o11bo2bo
16bo2bo14bobo2bo6b3o5bobo2bo14bobo2bo$29bobo6bobo10b2o18b2o12b2o2bob2o
12b2o2bob2o16bob2o$38bo46b2o3bo14b2o3bo19bo$51b2o18b2o18b2o18b2o18b2o$
52bo10b3o6bo19bo19bo19bo$31b2o19bobo10bo6bobo17bobo17bobo17bobo$32b2o
19b2o9bo8b2o18b2o18b2o18b2o$31bo3b2o$35bobo$35bo6$188bo$188bobo$188b2o
2$175bobo$163bo11b2o11bo$164b2o10bo10bo$163b2o22b3o4bo$192b2o$193b2o$
106bo$107bo55bobo13b2ob2o$105b3o56b2o12bobob2o$164bo9b2o2bobo$11bo162b
2o3b2o$10bo10bo87bo3bo5bo74bo2bo$10b3o8bobo83bobob2o4b2o74bo$8bo12b2o
85b2o2b2o4b2o73bo3bo$6bobo162bo14b4o3b4o$7b2o161bobo13bo3bo$170bo2bo
12bo$156b2o13b2o14bo2bo$58bo95b2ob2o$2o29b2o18b2o5bobo10b2o28b2o28b2o
21b4o13b2o9bobo$b2o7bo2b2o15bo2bo16bo2bo4b2o10bo2bo26bo2bo26bo2bo21b2o
13bo2bo8b2o$o8bobo2bo14bobobo15bobobo15bobobo25bobobo25bobo2bo34bobo2b
o8bo$9bob2o16bob2o16bob2o5bo10bob2o4b2o20bob2o4b2o20bob2obo34bob2obo
13b2o$10bo19bo19bo6b2o11bo5bo2bo20bo5bo2bo20bo2bo36bo2bo13b2o$11b2o18b
2o18b2o4bobo11b2o3bo2bo21b2o3bo2bo21b2o38b2o16bo$12bo19bo19bo19bo4b2o
23bo4b2o$12bobo17bobo17bobo17bobo27bobo15bo58b2o$13b2o18b2o18b2o18b2o
28b2o14b2o39b2o17b2o$119bobo37bobo$161bo2$172b2o11b3o$161b2o9bobo10bo$
160bobo9bo13bo$162bo5b2o$167b2o16bo$86b3o16b2o62bo14b2o$88bo15b2o69bo
8bobo$87bo18bo67b3o$173b2obo$173b3o$174b2o7$190bo$189b2o$189bobo!

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Re: LifeWiki Did-You-Knows

Post by dvgrn » June 13th, 2015, 2:11 pm

dvgrn wrote:I don't see a complete incremental synthesis of 25P3H1V0.2 anywhere -- has someone completed one? The partial syntheses I can find make me guess that the total is 62 gliders, but that may not be quite right...
I must have missed the super-ponds in my last scan of Catagolue. Looks to me as if a few of the C1 soups for super-ponds ought to produce something better than a 24-glider synthesis:

Code: Select all

x = 845, y = 258, rule = LifeHistory
615.2D$614.D2.D$613.D.2D.D$300.2D311.D2.D.D$299.D2.D311.D2.D$298.D2.D
.D311.2D$298.D.2D.D$299.D2.D$300.2D22$300.2A.2A.A2.A.A2.A288.2A2.2A2.
A.2A$301.2A.A.2A.3A2.A286.2A.A.A.A2.4A$300.A2.2A.2A2.A.2A286.A4.A4.2A
.2A$303.5A2.A2.A.A284.3A.A.A.A.A2.2A$300.2A.A.2A.2A.4A285.A3.3A.4A.3A
$303.A2.2A.A2.A.2A287.2A2.A3.A.3A$300.2A.A3.2A4.A287.A.3A.A.A2.A.A$
300.2A.A.2A.A3.3A286.A2.A4.A4.A$301.A.A.2A4.A288.3A2.A.3A.A2.A$300.A.
A7.4A.A284.3A.A3.2A2.A2.A$300.A5.2A.A.2A.A286.3A.A.A.2A.A$300.A.A.3A.
A.A3.A285.A.A2.A.2A.A$300.A2.A2.A2.A2.A.2A284.A.2A.2A.2A2.A2.A$300.A.
A7.2A2.A287.3A.A.A.A.A.A$302.A.4A.A.A.A288.4A2.A2.2A.2A$302.2A2.A3.3A
2.A286.A2.2A2.A.3A85$.2A.2A.3A2.2A.A285.2A.A2.A.A.A2.2A485.A.2A2.A.A.
4A$.3A.A.A.A2.A.2A284.A2.4A3.A.3A485.5A2.2A.3A$3A.A.4A.3A287.A2.A.3A.
2A.3A3.2D479.A3.9A.A23.2D$2A2.9A2.A285.A3.2A2.A.3A4.D2.D479.2A.A2.6A
2.A21.D2.D$2A.3A2.A.3A.2A285.3A.3A.A3.A3.D.2D.D481.A.3A.2A2.A21.D.D2.
D.2D$4.A.2A.A.2A.2A285.A2.9A2.A.D.D2.D480.3A4.2A3.A20.D.2D.D.2D$3A2.
3A.2A.A.A288.A5.2A4.A2.D2.D478.2A.A2.3A.A2.2A22.D2.D$A2.2A2.4A.A.2A
285.A3.A4.A2.3A3.2D479.A.4A2.A6.A22.2D$2.A3.4A4.2A289.A2.A3.4A484.A.
6A.2A.2A.A$A5.A.2A.3A.A284.A3.3A4.2A.2A484.A2.3A.A.2A3.A$3A3.3A.A.A.A
286.2A.2A.A.2A.A.A485.4A.A3.2A.4A$2.A.5A.A2.3A284.2A.3A2.A.A3.2A484.
2A2.2A.A.A3.2A$.3A.2A.4A.A288.2A2.A3.2A.3A485.3A.2A4.A2.2A$.A.4A.A.3A
2.A284.A3.4A2.4A487.A2.A2.5A2.A$3.A.A2.A.5A285.2A.A2.A3.A.A488.2A5.A
5.A$A6.2A5.A286.4A.A2.A490.A3.A2.A2.A2.2A5$15.2D$14.D2.D$13.D.D2.D$
13.D.2D.D$14.D2.D$15.2D74$500.2D114.2D$401.A.A.A.2A2.3A.A83.DA.C2.A2.
2A3.A.A92.A.A4.D2.D$401.A3.4A.2A2.2A82.D.ACAC2.5A.2A86.A2.3A2.A5.C2.D
.D$403.2A5.A.A85.D.2D.D.2A3.A2.2A85.A2.3A.4A2.AC.2D.D$400.2A.A.A3.A.A
.A.A83.DA.CA2.3A2.A.A88.2A3.3A2.2A.C2.D$400.A2.6A.A.A.2A84.2C3.3A4.3A
87.A5.A2.A.A2.2D$401.A3.A3.2A2.2A85.4A.A5.A3.A87.3A.A.2A.A.2A$400.3A
2.A.2A3.2A87.A4.A.4A2.A85.A2.A4.2A.A$400.2A.2A.A.2A3.A86.2A3.2A.2A2.A
2.A84.3A.A.8A$401.3A.5A.2A.A85.A2.3A.A.3A2.2A87.A3.2A2.A$400.2A2.2A3.
2A.A87.4A.2A.3A.4A88.2A.A4.A$405.3A2.2A2.2A85.A.A.A2.A.5A88.A2.A2.A.
2A$400.A.A.2A.3A.2A2.A88.A2.A.2A.A2.A84.A2.3A.2A.A3.A$401.2A2.2A.A2.A
.A86.2A2.2A.4A.A87.2A2.A4.2A$401.5A5.A88.3A.4A5.3A84.3A.5A2.A2.2A$
400.A.A.3A.2A.5A88.A2.3A2.4A85.A.A2.3A2.A$400.3A.2A3.4A.A86.A4.A.A.A
3.2A84.A3.A3.3A.A.A7$398.2D$397.D2.D$396.D2.D.D$396.D.2D.D$397.D2.D$
398.2D!
Especially the top two, I think. I didn't look much at the hundreds of symmetric soups, just because the super-pond settled out of the first ten soups in just a few ticks, usually less than five. There seem to be a lot of immediate predecessors of super-ponds in diagonally symmetric soup corners, but at least to my untrained eye they don't seem to offer any obvious construction hints.

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Re: LifeWiki Did-You-Knows

Post by Sokwe » June 13th, 2015, 5:23 pm

dvgrn wrote:I must have missed the super-ponds in my last scan of Catagolue. Looks to me as if a few of the C1 soups for super-ponds ought to produce something better than a 24-glider synthesis
Chris Cain found a 7-glider synthesis here.

Chris also found a 60-glider synthesis of a pufferfish spaceship in February 2015 (see here under edit 5).

Edit: I put together a 48-glider synthesis of 25P3H1V0.2 here.
-Matthias Merzenich

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Re: LifeWiki Did-You-Knows

Post by dvgrn » November 24th, 2016, 6:54 pm

We're up to 68 Did-You-Knows on the LifeWiki, and I'm temporarily out of inspiration again. There are seven spaces left to fill in the current list (though of course we could add more).

So what else is new and/or surprising, that hasn't been mentioned yet?

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Re: LifeWiki Did-You-Knows

Post by muzik » November 24th, 2016, 7:14 pm

+1 DidYouKnow added to inventory. It's one that surprises me a lot

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Re: LifeWiki Did-You-Knows

Post by drc » November 25th, 2016, 1:43 pm

I think #3 is technically out of date. However, that's debatable.

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Re: LifeWiki Did-You-Knows

Post by dvgrn » November 25th, 2016, 3:04 pm

drc wrote:I think #3 is technically out of date. However, that's debatable.
I added the "and combinations thereof" phrase just recently, in an effort to up-to-date-ify that one. What am I forgetting that's come out of nonsymmetric soups, that isn't basically a combination of switch engines?

As far as non-c/12 puffers go, I know a double blinker puffer showed up recently, but that was from a symmetric soup. The periods of all of Catagolue's C1 linear-growth patterns look suspiciously like multiples of 96.

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Re: LifeWiki Did-You-Knows

Post by praosylen » November 25th, 2016, 9:33 pm

dvgrn wrote:
drc wrote:I think #3 is technically out of date. However, that's debatable.
I added the "and combinations thereof" phrase just recently, in an effort to up-to-date-ify that one. What am I forgetting that's come out of nonsymmetric soups, that isn't basically a combination of switch engines?

As far as non-c/12 puffers go, I know a double blinker puffer showed up recently, but that was from a symmetric soup. The periods of all of Catagolue's C1 linear-growth patterns look suspiciously like multiples of 96.
While they are combinations of switch engines, they are not all combinations of block-laying and glider-producing switch engines per se.
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Re: LifeWiki Did-You-Knows

Post by Kiran » November 26th, 2016, 5:45 pm

The lightspeed telegraph in the large patterns collection can be adapted to send a signal back along a different channel.
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Re: LifeWiki Did-You-Knows

Post by dvgrn » November 30th, 2016, 9:25 am

User testitemqlstudop has proposed a CA question-gathering Q&A site on Stack Exchange. It has already gathered a few questions that could be adapted into LifeWiki Did-You-Knows (or more often there's already a related did-you-know in the list.) I still have a completely arbitrary goal of a hundred Did-You-Knows, and this Q&A site might be a good source of new ideas if it can be gotten off the ground...!

Currently the site needs 47 more followers to progress to the next level. That's certainly within reach with a little effort. When y'all have a moment, please follow and ask a question (forty more of those are needed too). It doesn't have to be the best question anyone ever thought of -- if it's something you don't know the answer to, there will be other people out there who don't know it either.

Seems to me that "Thread for your basic questions" type Q&A would be fine to add, though most of what has been added so far isn't really so basic.

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Re: LifeWiki Did-You-Knows

Post by ColorfulGalaxy » July 16th, 2020, 5:34 am

Code: Select all

x = 41, y = 1, rule = B3/S23 
41o!
This is the smallest one-cell-high rectangle methuselah that gives pulsars.

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Re: Thread For Your Accidental Discoveries

Post by ColorfulGalaxy » July 29th, 2020, 10:27 pm

Did you know that the French Kiss remained without a glider construction for a long time,
but there is a one-glider destruction for the French Kiss?

Notice the italicized part.

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Re: LifeWiki Did-You-Knows

Post by GUYTU6J » July 29th, 2020, 11:34 pm

ColorfulGalaxy wrote:
July 16th, 2020, 5:34 am

Code: Select all

x = 41, y = 1, rule = B3/S23 
41o!
This is the smallest one-cell-high rectangle methuselah that gives pulsars.
ColorfulGalaxy wrote:
July 29th, 2020, 10:27 pm
Did you know that the French Kiss remained without a glider construction for a long time,
but there is a one-glider destruction for the French Kiss?

Notice the italicized part.
No, these are trivial and not worth mentioning on the LifeWiki. Also please don't change the subject to "Re: Thread For Your Accidental Discoveries" — it is annoying to see it in irrelevant subforums everywhere.
(I have written Tutorials/Glider_syntheses#assisted_cleanup for you, did you read it?)

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Re: LifeWiki Did-You-Knows

Post by gameoflifemaniac » August 20th, 2020, 2:20 pm

GUYTU6J wrote:
July 29th, 2020, 11:34 pm
ColorfulGalaxy wrote:
July 16th, 2020, 5:34 am

Code: Select all

x = 41, y = 1, rule = B3/S23 
41o!
This is the smallest one-cell-high rectangle methuselah that gives pulsars.
ColorfulGalaxy wrote:
July 29th, 2020, 10:27 pm
Did you know that the French Kiss remained without a glider construction for a long time,
but there is a one-glider destruction for the French Kiss?

Notice the italicized part.
No, these are trivial and not worth mentioning on the LifeWiki. Also please don't change the subject to "Re: Thread For Your Accidental Discoveries" — it is annoying to see it in irrelevant subforums everywhere.
(I have written Tutorials/Glider_syntheses#assisted_cleanup for you, did you read it?)
agreed
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Code: Select all

b4o25bo$o29bo$b3o3b3o2bob2o2bob2o2bo3bobo$4bobo3bob2o2bob2o2bobo3bobo$
4bobo3bobo5bo5bo3bobo$o3bobo3bobo5bo6b4o$b3o3b3o2bo5bo9bobo$24b4o!

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Re: LifeWiki Did-You-Knows

Post by ColorfulGalaxy » October 17th, 2020, 3:47 pm

Did you know...
  • ... that the currently smallest known pi-heptomino to blinker converter has 34 cells?
  • ... that Conway said that he regretted calling 5P4H1V1 "Glider" in a YouTube Video?
  • ... that the currently smallest known B-heptomino to Herschel Converter has only 4 cells?
  • ... that it is suspected but unproven that the pentadecathlon could be used as a tagalong?
  • ... that the current logotype of LifeWiki reveals a phase of the B52Bomber?
  • ... that an eater can eat a nearby eater at a certain position? That is, eaters can eat eaters.
  • ... that LifeWiki has a page for the LifeWiki?
  • ... that the pentadecathlon (not sure if it's the only known or first known one that does this) has a phase with 1 island, a phase with 2 islands, a phase with 3 islands, and a phase with 4 islands?
  • ... that the largest known One Cell Thick With All Cells Alive spark has 24 (Not sure if larger ones are found) cells?
  • ... that Unit OCA Cells exist in Life? It has not been proven that unit Life cells exist in OCA.
  • ... that the TBS spark can turn a glider into a block, and then another TBS spark at the same position can turn that same block into a glider?
  • ... that Corderships with period 384 are suspected to exist in Life, but none have yet been found?

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Re: LifeWiki Did-You-Knows

Post by dvgrn » October 17th, 2020, 8:50 pm

Some of these seem a little suspect. For example --
ColorfulGalaxy wrote:
October 17th, 2020, 3:47 pm
  • ... that Corderships with period 384 are suspected to exist in Life, but none have yet been found?
-- there's a p384 Cordership in Golly's pattern collection, under Life/Spaceships/Cordership-LWSS-freeze-tag.rle.

It would be pretty surprising if there was no known p384 Cordership, since at the very least one could be built trivially by adding a few Corderships and/or Corderrakes to a glider-producing switch engine or two, since those are p384.

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Re: LifeWiki Did-You-Knows

Post by wildmyron » October 18th, 2020, 2:36 am

Some others are also incorrect.
ColorfulGalaxy wrote:... that Unit OCA Cells exist in Life? It has not been proven that unit Life cells exist in OCA.
There are numerous unit cells in OCA. E.g. Hactar's 2x2 unit cell rule viewtopic.php?p=73391#p73391 and the 8-state BCC intermediate rule which is used by the 0E0P metacell when it is programmed to simulate B3/S23.
I'm sure there's also a CGoL unit cell in Wireworld or one of its variants and there's also others in various rules designed for computational universality. (Sorry, don't have links to those).
If by OCA you mean INT 2-state rules on Moore neighbourhood, then there are also unit cells that have been constructed in such rules. The primary example I can think of is Rule R by Emmanuel Sapin, see https://conwaylife.com/forums/viewtopic ... 3cb#p33880 and the paper linked therein for further details. Numerous other OT and INT rules have been shown to have logic/computation universality, so they have the necessary components to build a unit cell, it's just that nobody has bothered to do so/posted about it on this forum. (I suspect there are some other examples it the academic literature, but I can't point to any right now.)


A few of the other suggestions seem rather trivial/arbitrary to be included, but then I don't maintain much on LifeWiki so I'll leave that to others to decide.
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Re: LifeWiki Did-You-Knows

Post by ColorfulGalaxy » October 18th, 2020, 4:08 pm

dvgrn wrote:
October 17th, 2020, 8:50 pm
Some of these seem a little suspect. For example --
ColorfulGalaxy wrote:
October 17th, 2020, 3:47 pm
  • ... that Corderships with period 384 are suspected to exist in Life, but none have yet been found?
-- there's a p384 Cordership in Golly's pattern collection, under Life/Spaceships/Cordership-LWSS-freeze-tag.rle.

It would be pretty surprising if there was no known p384 Cordership, since at the very least one could be built trivially by adding a few Corderships and/or Corderrakes to a glider-producing switch engine or two, since those are p384.
And something more: The pentadecathlon has an average population of 314/15. that's 5 digits of pi

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Re: LifeWiki Did-You-Knows

Post by ColorfulGalaxy » October 20th, 2020, 5:22 pm

Did you know that the smallest oscillator that is completely asymmetric (not even glide) is... (not sure yet)
Did you know that hasslers can be hassled? Example: Snacker-based Al-Jolson variant
Did you know that the glider-block cycle is a proof that the wick can have arbitrarily high periods?
Did you know that the current logotype of Catagolue resembles ...?
The smallest oscillator with population change is the beacon, and the smallest oscillator with bounding box size change is the toad.
Rules exist where the smallest Garden of Eden has a population of 0.

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