Thread for basic questions

[Book]

The figure is clickable in the PDF version, if you're using Adobe Acrobat, to get the RLE. (Very nearly all of the illustrations work that way.)

Argh. Foiled by Chrome native pdf handler.

What would you name this? "Lightspeed teleporter"?

[dvgrn]

What would you name this? "Lightspeed teleporter"?

I'm not sure I'd want to give it a name that's any shorter than "mechanism that could be used for diagonal lightspeed communication" -- the important word being "diagonal".

It's not a complete signal-processing system until there's some plausible way of generating the gliders. We could only manage lightspeed "teleportation" of a glider over fairly short distances, much shorter than the long diagonal of the mechanism producing the gliders.

[confocaloid]

What are any previous censuses where instead of counting occurrences of single objects, the "types" of the final patterns are counted? Here the "type" may mean either the set of objects occurring in the ash (e.g. "blocks and blinkers, and nothing else", "nothing") or the multiset of objects occurring in the ash (e.g. "two blocks and one blinker, and nothing else").

[Anivec]

How would you insert the last eater1?

Code: Select all

x = 761, y = 60, rule = B3/S23
675bo$673bobo$674b2o3$681bo$98bo583b2o$99bo12bo568b2o$97b3o12b2o$111b
obo3bo139bo$116b2o137b2o14bo70bo$116bobo137b2o11b2o69bobo$270b2o69b2o
$350bo$257bo92bobo$257b2o91b2o$15bo240bobo$13bobo372bo301bobo$14b2o283b
obo86bobo300b2o$300b2o86b2o301bo$300bo8b2o35b2o30b2ob2o46b2o53b2o62b2o
42b2o43b2o48b3o19b2o33bo$23bo51bo43bo37bo50bo57bo41bo2bo33bo2bo29bo3b
o3bo42bo54bo63bo43bo44bo51bo19bo34b3o9b2o$9bo11b2o50b3o41b3o33bob3o38b
o7bob3o53bob3o40bob3o30bo3b3o26bo3b3o3b2o39bo3b3o48bo3b3o57bo3b3o37bo
3b3o38bo3b3o47bo17bo3b3o34bo8bo$8b2o12b2o48bo43bo36b2o42bo6b2o56b2o36b
2o5b2o33b4o29b4o6bobo38b4o3bo47b4o3bo56b4o3bo36b4o3bo37b4o3bo64b4o3bo
32b2o5bo3b3o$4bo3bobo61bob2o40bob2o36b2o37b3o9b2o56b2o25bo8b2o7b2o35b
2o31b2o49bobo52bobo61bobo41bobo42bobo69bobo39b4o3bo$4b2o65b2ob2o39b2o
b2o33b2ob2o46b2ob2o53b2ob2o25b2o6bo6b2ob2o32b2ob2o28b2ob2o46b2ob2o50b
2ob2o59b2ob2o39b2ob2o40b2ob2o67b2ob2o45bobo$3bobo46b2o18bo43bo37bo50b
o56b2o27bobo13b2o35b2o31b2o49b2o53b2o62b2o42b2o43b2o70b2o45b2ob2o$52b
2o18bob2o40bob2o34bob2o47bob2o56b2o43b2o35b2o31b2o49b2o53b2o62b2o31bo
10b2o43b2o70b2o42b2o$73bobo41bobo35bobo48bobo9bo47bo44bo36bo32bo50bo54b
o63bo32bo10bo44bo71bo45b2o$48b3o156bo10bobo44bo44bo36bo32bo50bo54bo63b
o31b3o9bo44bo71bo47bo$50bo108bobo29b2o25b2o45b2o30b3o10b2o35b2o31b2o49b
2o53b2o62b2o42b2o43b2o70b2o45bo$49bo109b2o29bobo106bo458b2o$b2o23bo133b
o31bo105bo118bo6b2o$obo22b2o128b3o252bo7b2o3b2o205b2o70b2o$2bo22bobo127b
o255b2o4b2o6bo203bo2bo68bo2bo44b2o5b2o$156bo40b3o11b3o196b2o55b2o3b2o
57b2o3b2o37b2o3b2o38b2o3b2o3bobo59b2o3b2o3bobo43bo2bo4bobo$199bo11bo255b
obobobo57bobobobo37bobobobo7b2o29bobobobo4bo60bobobobo4bo35b2o3b2o3bo
bo6bo$14b2o182bo8b2o3bo202b2o52bobo61bobo4b2o35bobo9bobo30bobo21bo47b
obo9b2o31bobobobo4bo7b2o$13b2o191bobo207b2o51bobo60bo2b2o3b2o34bo2b2o
8bo31bo2b2o19bo47bo2b2o8bo34bobo9b2o$15bo192bo206bo51bobobobo58bobo41b
obo42bobo21b3o45bobo11b3o30bo2b2o8bo$195bo271b2o3b2o59bob2o6b2o32bob2o
41bob2o17bo50bob2o11bo30bobo11b3o$195b2o292b3o43bo7bobo33bo44bo17b2o52b
o44bob2o11bo$194bobo292bo45bobo5bo35bobo42bobo15bobo51bobo44bo$490bo45b
2o42b2o43b2o70b2o44bobo$486b2o15b2o239b2o$485bobo15bobo$487bo15bo3$488b
3o$488bo$489bo$652b2o$651b2o$653bo3$659b2o$659bobo$659bo!

[muzik]

The following posts from several years ago appear to imply the existence of a third figure eight on pulsar isomer:

I think the next isomer of p24 should be named "bland p24" or something like that

Dull p24. There should be one left.

Does such a thing exist, and if so, why has it not appeared in C1 so far?

[cvojan]

I don't think so, there are only two different rotations the figure 8 can assume on one of the pulsar's finger sparks

[Book]

Does anyone have reference or key for the image in the gallery in the kinetic symmetry wiki page? Like which symmetry each pattern illustrates? Are they in the same order as the table?
(https://conwaylife.com/wiki/Kinetic_symmetry#Gallery)

[muzik]

Is there an official name for this spark?

Code: Select all

x = 3, y = 4, rule = b3/s23
bo$3o$3o$bo!

I've decided to finally create a wiki page for this thing under the name of line-of-six spark, with some other names that I've seen thrown around listed in the introductory section with references. So perhaps this is a fitting answer, unless someone wants to dispute which of those names in the intro section should be used instead.

On the topic of potentially notable sparks with unknown names, this massive, highly symmetric spark/diehard with two very simple 9-cell initial conditions doesn't seem to have a name either:

Code: Select all

x = 3, y = 5, rule = B3/S23
3o$bo$bo$bo$3o!

Code: Select all

x = 3, y = 7, rule = B3/S23
bo$3o2$bo2$3o$bo!

It's worth a footnote at least somewhere since this spark is a fundamental part of the period-240 slow puffer, as the spark ignites (absolutely love it when disconnected CA terms like these make sense together) the fuse which the head puffer lays. Besides that, I don't know of any other situations where it pops up. The period-44 pi hassles hassles a rather similar configuration of two pi-heptominoes which is fundamentally different due to t having even symmetry whereas this spark is odd in both directions. Back when I independently rediscovered this in my own early Life experimentation I named it "firework", and am probably the only person in the world to have given this specific pattern this specific name, so if there are any other names with nonzero staying power due to not being used by one and only one person I'd be overjoyed to hear them.

[Wyirm]

Is there an official name for this spark?

Code: Select all

x = 3, y = 4, rule = b3/s23
bo$3o$3o$bo!

I've decided to finally create a wiki page for this thing under the name of line-of-six spark, with some other names that I've seen thrown around listed in the introductory section with references. So perhaps this is a fitting answer, unless someone wants to dispute which of those names in the intro section should be used instead.

On the topic of potentially notable sparks with unknown names, this massive, highly symmetric spark/diehard with two very simple 9-cell initial conditions doesn't seem to have a name either:

Code: Select all

x = 3, y = 5, rule = B3/S23
3o$bo$bo$bo$3o!

Code: Select all

x = 3, y = 7, rule = B3/S23
bo$3o2$bo2$3o$bo!

...

I don't think there's an official name anywhere, but that's the object being hassled in worker bee.

Code: Select all

x = 11, y = 16, rule = B3/S23
o9bo$3o5b3o$3bo3bo$2b2o3b2o3$5bo$4b3o$4b3o$5bo3$2b2o3b2o$3bo3bo$3o5b3o
$o9bo!

[muzik]

I don't think there's an official name anywhere, but that's the object being hassled in worker bee.

Code: Select all

x = 11, y = 16, rule = B3/S23
o9bo$3o5b3o$3bo3bo$2b2o3b2o3$5bo$4b3o$4b3o$5bo3$2b2o3b2o$3bo3bo$3o5b3o
$o9bo!

...which is why that was mentioned several times within the article that was linked?

[confocaloid]

On the topic of potentially notable sparks with unknown names, this massive, highly symmetric spark/diehard with two very simple 9-cell initial conditions doesn't seem to have a name either:

Code: Select all

x = 3, y = 5, rule = B3/S23
3o$bo$bo$bo$3o!

Code: Select all

x = 3, y = 7, rule = B3/S23
bo$3o2$bo2$3o$bo!

It's worth a footnote at least somewhere since this spark is a fundamental part of the period-240 slow puffer, as the spark ignites (absolutely love it when disconnected CA terms like these make sense together) the fuse which the head puffer lays. Besides that, I don't know of any other situations where it pops up.
...

Code: Select all

#C Two octohash matches for b3o$o3bo$2ob2o4$2ob2o$o3bo$b3o!
x = 57, y = 6, rule = B3/S23
55bo$2o38b2o12bo$obo7b2o28bobo7b2o2b3o$bobo6bo3b3o24bobo6bo$2bo5bobo3b
o27bo5bobo$8b2o5bo32b2o!

Code: Select all

#C One octo3g match for b3o$o3bo$2ob2o4$2ob2o$o3bo$b3o!
x = 23, y = 17, rule = B3/S23
bo$2bo$3o7$20bo$21bo$19b3o3$20b3o$22bo$21bo!

Code: Select all

#C 19 octo3obj matches for b3o$o3bo$2ob2o4$2ob2o$o3bo$b3o!
x = 1163, y = 15, rule = B3/S23
6b3o67b2o60bo60b3o54b2o8b3o52b2ob2o63b2ob2o61b2o63b2o2b3o49b2o74b2o57b
3o54b2ob2o59b2o71b2o62b2o55b2ob2o61b2o64b2ob2o$10b2o52b2o6b2ob2o60b2o
64b2o51b2o4b2o2bo54b2ob2o63b2ob2o60bo2bo54b2o5bo2bobo51b2o62b2o6b2ob2o
115b2ob2o59b2o7b2o58b2o2b2o62b2o55b2ob2o61b2o2b2o60b2ob2o$2o7b2o53b2o
6b2o3bo55b3obobo52b2o8b2o57bo2bo2bo180b2o5b2o55b2o6b2o3bo114b2o6b2o3bo
51b2o130b2o2b2o58b2o58bo134b2o$2o3bo5bo116b2o62b2o4bo5bo57b2o63b2o119b
2o134b2o118bo2bo124b2o3b2o121bobo6b2o$5bo58b2o6b2o54b2o68bo127bo2bo54b
o127b2o70b2o54b2o6b2o55b2o5bo63b2o54b2o8bo53b2o62bobo6b2o57b2o$2o3bo
58b2o6b2o118b2o4bo128b2o55bo63b2o6b2o54b2o5b2o57bo61b2o6b2o61bobo61bo
2bo62b2o53b2o63bo62b2o2b2o58b2o3bo$2o66b2o58b2o6b2o54b2o190bo3b2ob2o
55b2o5bo2bob3o55bo2bo55bobo4b2o59bo65bobo62b2o63bobo120b2o58b2o62b2o3b
o63b2o$67bo2bo57b2o2b2o2b2o121b2ob2o57b2ob2o62b2ob2o2b2o59b2o2bo58b2o
56bobo4b2o58bobo65bo55b2ob2o64b3o56b2o6b3o57b2o2b2o2b2o119bo63b2o$68b
2o62b2o125b2ob2o57b2ob2o68b2o65bo116bo65bobo121b2ob2o5b3o115b2o70b2ob
2o53bo4b3o54b2o5b3o54b2o$396bo248bo67b3o62bo128b2o64bo51b2o61b2o5bo56b
2o3b2o$321bo254b2o135bo65bo127bobo115bobo68bo60b2o$320b2o254bobo135bo
192bo$320bobo253bo582bo$1158b2o$1158bobo!

[GUYTU6J]

I am writing for the totalistic rules Vote (B5678/S45678) and Vote 4/5 (B4678/S35678) on LifeWiki. Is there anything good in old emails about them?
(I have another related question, too, but it was buried by another post)
Is a period-3 or above oscillator possible in Vote?
As there are a number of natural periods on catagolue, is Vote 4/5 possibly omniperiodic?

[dvgrn]

I am writing for the totalistic rules Vote (B5678/S45678) and Vote 4/5 (B4678/S35678) on LifeWiki. Is there anything good in old emails about them?

Somewhat surprisingly, I'm getting zero relevant hits from searches by rulestring or by the word "Vote", in the LifeCA archives.

[squareroot12621]

Should there be a thread for conduits that work, except for first/second/etc. natural gliders, and a weld of some sort is required?

[dvgrn]

Should there be a thread for conduits that work, except for first/second/etc. natural gliders, and a weld of some sort is required?

Seems like that description represents a good fraction of Herschel conduits -- a number of them have an attachment that either absorbs the output Herschel's first natural glider, or else they assume that the following conduit is a dependent conduit which prevents the first natural glider from appearing.

Seems like you can't be talking about elementary conduits, since the "first/second natural glider" only applies to Herschels. Anyway, it seems like the current collection threads are sufficient. A Herschel conduit that needs a glider-suppressing weld is still a Herschel conduit, and can be posted to that thread.

[Anivec]

Can we make another snark/syringe?

Code: Select all

 x = 15, y = 17, rule = B3/S23
5bo$4bobo$4bob3o$b2obo4bo$bobobobobo$3bobob2o4b2o$2bobo8bo$3bo7bobo$11b
2o2$bo$2bo$3o3$2o$2o!

Code: Select all

 x = 15, y = 17, rule = B3/S23
12bo$12bobo$12b2o2$4b2o$4b2o4$2ob2o$ob2obobo$5b2obo$b2obo3b3o$bo3b3o3b
o$2b3o3b3o$5bo2bo$4b2o!

[qqd]

What are the uses of this catalyst other than hassling HFs?

Code: Select all

x = 13, y = 13, rule = B3/S23
6b2obo$ob2obobob3o$2obobobo4bo$4bobobobobo$6bobob2o$5bobo$6bo3$3b2o$3b
obo$3b3o$4bo!

[Wyirm]

Can we make another snark/syringe?

Code: Select all

 x = 15, y = 17, rule = B3/S23
5bo$4bobo$4bob3o$b2obo4bo$bobobobobo$3bobob2o4b2o$2bobo8bo$3bo7bobo$11b
2o2$bo$2bo$3o3$2o$2o!

Code: Select all

 x = 15, y = 17, rule = B3/S23
12bo$12bobo$12b2o2$4b2o$4b2o4$2ob2o$ob2obobo$5b2obo$b2obo3b3o$bo3b3o3b
o$2b3o3b3o$5bo2bo$4b2o!

The first reaction seems very similar to the snark, and that's because it is. I'm not exactly a catalyst expert but perhaps another catalyst could be used instead of 31.4 to restore the block.

Code: Select all

x = 22, y = 27, rule = LifeSuper
12.A$11.A.A$11.A.3A$8.2A.A4.A$8.A.A.A.A.A$10.A.A.2A4.2A$9.A.A8.A$10.A
7.A.A$18.2A3$7.C.C$8.2C$8.C2$2A5.2A$2A5.2A3$12.A$8.2A.A.A$7.A.A.A.A$
4.A2.A.A.A.A.2A$4.4A.2A2.A2.A$8.A4.2A$6.A.A$6.2A!

[Timelord Missionary]

How do I embed a lifeviewer into my post? If there isn’t a place where a pattern is, do I have to type out the RLE manually?

[dvgrn]

How do I embed a lifeviewer into my post? If there isn’t a place where a pattern is, do I have to type out the RLE manually?

Try an experimental reply to one of the above posts that includes an embedded LifeViewer. You'll see all the tags that you need to add, and you'll see how it translates into an actual LifeViewer when you hit Preview (just don't actually post your experimental message). Basically you just need a "code" tag and a "/code" tag, both in square brackets.

RLE is usually copied and pasted from somewhere else, rather than typed in manually. If you paste in a chunk of RLE text, you can select it and then click the "code display" button above the post edit box -- the icon looks like </>.

[Anivec]

Can we make another snark/syringe?

Code: Select all

 x = 15, y = 17, rule = B3/S23
5bo$4bobo$4bob3o$b2obo4bo$bobobobobo$3bobob2o4b2o$2bobo8bo$3bo7bobo$11b
2o2$bo$2bo$3o3$2o$2o!

Code: Select all

 x = 15, y = 17, rule = B3/S23
12bo$12bobo$12b2o2$4b2o$4b2o4$2ob2o$ob2obobo$5b2obo$b2obo3b3o$bo3b3o3b
o$2b3o3b3o$5bo2bo$4b2o!

The first reaction seems very similar to the snark, and that's because it is. I'm not exactly a catalyst expert but perhaps another catalyst could be used instead of 31.4 to restore the block.

Code: Select all

x = 22, y = 27, rule = LifeSuper
12.A$11.A.A$11.A.3A$8.2A.A4.A$8.A.A.A.A.A$10.A.A.2A4.2A$9.A.A8.A$10.A
7.A.A$18.2A3$7.C.C$8.2C$8.C2$2A5.2A$2A5.2A3$12.A$8.2A.A.A$7.A.A.A.A$
4.A2.A.A.A.A.2A$4.4A.2A2.A2.A$8.A4.2A$6.A.A$6.2A!

I'm going to check them all

Code: Select all

x = 156, y = 319, rule = B3/S23
82b2o$82b2o$115b2o$114bo2bo$84bo29b2obo$14bo29bo29bo8bobo18bo10bob2o15b
o$13bob2o26bob2o6b2o3b2o13bob2o7bo18bob2o8bobo2bo12bob2o6b2o$14b2o28b
2o6bo2bo2b2o14b2o28b2o6b2obo3b2o13b2o8bo$53bobo28bo27b2o2bo27bob2o$20b
2o32bo28bobo29b2o26b2o2bo$20bobo61bo55bo4b2o$22bo29bo4b2obo54b2o23b5o
$22b2o27bobo3b2ob3o50bo2bo21b2o4bo$52bo10bo18b2o18b2o9b3o23bo2b2o$42b
2o13b2ob3o19b2o19bo12b3o20bobo$43bo12bo2b2o39b3o12bo2bo15bo2bobobo$40b
3o13b2o42bo15b2o16b4ob2o$40bo97bo$136bobo$136b2o5$110bo$108b3o$107bo$
50bo51b2o3b2o$49bobo49bo2bo$50bo51b2o26bo$130b3o$54bo69b2o7bo$48b2o3b
obo68bo7b2o$48bobo3bo67bobo$49b2o33b2o36b2o18bo2b2o$14bo29bo29bo8bo2b
o17bo8b2o19bo6bobo2bo$13bob2o26bob2o26bob2o7b2o17bob2o5bo2bo17bob2o5b
2obo$14b2o28b2o28b2o28b2o7bobo18b2o8bo$114bo27b2o$21b2o64b2o53bo$21bo
bo63bo56bo$23bo64b3o52b2o$23b2o65bo$72b2o$73bo$70b3o$70bo14$64b2o$64b
o48b2o$62bobo48bo$62b2o47bobo$14bo29bo8b2o19bo29bo6b2o21bo$13bob2o26b
ob2o5bo2bo17bob2o26bob2o26bob2o$14b2o28b2o7bobo18b2o28b2o28b2o$54bo88b
2o$22b2o57b2o28b2o29bo2bo$22bobo54bo2bo28bobo29b2o$24bo54b3o31bo$24b2o
87b2o$79b2obob2o$80bob2obo46b2o9b2obo2bo$80bo52bo10bob4o$79b2o49b3o9b
obo$130bo11b2o2b2o$147bo$146bo$146b2o7$82b2o$82bo$40bo38b2obo$40b3o36b
obo$43bo32b2obo$42b2o32bobobo62b2o$80bo2b2o58bo$79b2obobo56bobo$14bo29b
o29bo7bobob2o16bo29bo6b2o$13bob2o26bob2o26bob2o5b2obobo15bob2o26bob2o
$14b2o28b2o28b2o9bo18b2o7b2o19b2o$82b2obobo23bo2bo29b2o$82bobob2o23b3o
28bo2bo$79b2obobo57b3o$17b2obo2bo56bo2b2o26b2obob2o$18bob4o52bobobo31b
ob2obo22b7o$16bobo57b2obo26b2obo2bo26bo6bo$16b2o2b2o19bo37bobo25bob4o
27b2obobo$21bo18bobob2o33b2obo22bobo25bo7bob2o$20bo19bobobobo35bo22b2o
2b2o21bobo6bo$20b2o15b2obobobobo2bo32b2o26bo21bobo7b3o$37bo2bo2b2ob4o
59bo23bo10bo$39b2o4bo63b2o26b2o$45bobo89bobo$46b2o91bo$139b2o$28b2o$22b
2o5bo$17bo4bobob3o$17b3o4bobo$20bo3b2o44bo$19b2o48bobo$70bo69bo$138b3o
$66bo70bo$22b2o28b2o11bobo3b2o52b2o10b2o$21bo2bo27bo13bo3bobo53bo17b2o
$22b2o26bobo17b2o54bobo14bobo$14bo29bo5b2o22bo29bo22b2o5bo8b2o$13bob2o
26bob2o26bob2o26bob2o26bob2o10b2o$14b2o28b2o28b2o28b2o28b2o11bobo$110b
2o37bo$51b2o58bo37b2o$51bo57bo2b2o$48b2obo57b3o2bo$46bo2bob2o49b2o9bo
$45bob2o19b2o33bo3b6o$46bo21b2o3bo26b3o4bo2bo$44bobo25bobo25bo$44b2o27b
o8$111bo$109b3o$108bo$10bo29bo29bo37b2o$9bobo27bobo27bobo$10bo29bo29b
o$106b2o$6bo29bo29bo39b2o$5bobo3b2o22bobo3b2o22bobo3b2o$6bo3bobo23bo3b
obo23bo3bobo$10b2o28b2o28b2o$14bo29bo29bo29bo29bo$13bob2o26bob2o26bob
2o18b2o6bob2o26bob2o$14b2o28b2o28b2o19bo8b2o28b2o$92b2obo$92bo2b2o43b
2o$93b2o45bobo$95b2o45bo$66b2o27bo46b2o$19bo46bo2b2o21b2obo33b2o$18bo
bo20bo25bobo2b2o18b2ob2o32bo$18bobo19bobobo2bo18b2o2bob2o2b2o2b2o44b2o
bo4bo$16b2o3b2o17bobob4o20bobo5bo4bo44b2obobobobo2bo$17bob2o2bo15b2ob
2o24bobo6b4o49b2obob4o$15bobobo2bo18bo3b3o21bo64bo$15b2o3b2o19bob2o2b
o31b2o55bo$42bobo34b2o54b2o9$149b2o$145b2o2bobo$145bobobo2bo$29b2o81b
2o33bobob2o$30bo81bo33b2obo$30bobo49b2o26bobo36bob2o$14bo16b2o11bo29b
o5bo2bo20bo5b2o22bo14bobo2bo$13bob2o20bo5bob2o26bob2o3b3o20bob2o26bob
2o7b2o4bo2b2o$14b2o20bobo5b2o28b2o28b2o28b2o7bo2bo$37bo42b2obob2o57b2o
4bo2b2o$20b2o9b2o48bob2obo62bobo2bo$20bobo7bobo48bo67bob2o$22bo7bo49b
2o64b2obo$22b2o5b2o116bobob2o$9b2o87b2o45bobobo2bo$8bo2bo3bo2bo79b2o2b
2o41b2o2bobo$6bo2b2o4b4o18b2o64bo45b2o$6b2obo3b2o4b2o16bo4b2o30bo9bo12b
ob4o$9bo2bo3b2obobo16bo3b2o30b3o5b3o12b2obo$9bobob2obobo2bo17bo37bo3b
o$10b2obobo2bobo16bob5o32b2o3b2o$13bobobobo16bobo4bo$10b4obo2bo17bobo
2bo$10bo5b2o19bo3b2o$11bo81b2o$10b2o72bo9bo$69b2o12bobo7bo$15b2o52b2o
12b2o8b2o$10bo4bobob2obo72bo37b2o$10b3o4bobob2o56bo13b3o5bo32bo$13bo3b
2o21bo29bo7bobo11bo7bobo31bob2o3b2o$6b2o4b2o26b3o27b3o5bobo11b2o6bobo
32bobo4bo$7bo35bo29bo5bo21bo35bob3o$7bobo32b2o28b2o21b2o39b2obo$8b2o42b
2o40bobo$53bo40bo$14bo29bo6bo22bo18b2o9bo29bo$13bob2o26bob2o4b2o20bob
2o26bob2o26bob2o$14b2o28b2o7bo20b2o28b2o28b2o$51b2obo$50bobobo$51bo2b
ob2o$6bo2bob2o41bobo$6b4obo41b2obo$11bobo36bobo2bo$8b2o2b2o36b2o2bo$8b
o46b3o$9bo47bo$8b2o7$105b2o$105bobo2b2o$107bo3bo$103b4ob3o$103bo2bobo
$106bobob3o17bo7b2o$42bo7bo56b2obo2bo16b3o5b2o$41bobo4b3o61b2o19bo$22b
2o18bo4bo84b2o16b2o$22bo24b2o63b2o31b2o2bo2bo$20bobo87bo2bo31bobo2b2o
$14bo5b2o22bo29bo29bo5b3o21bo13b2o$13bob2o21b2o3bob2o26bob2o26bob2o6b
3o17bob2o12bo$14b2o22b2o4b2o28b2o28b2o6bo3bo17b2o13bob2o$113b3o30b2ob
o2bo$20b2o59b2o27b3o33b2ob2o$20bobo56bo2bo27bo2bo$22bo56b3o30b2o$22b2o
48b2o$73bo3b3o64b2o$70b3o3bo2bo64bo$70bo5b2o30b2o35b3o$14bo9bo19bo9bo
53bobo36bo$14b3o5b3o19b3o5b3o55bo$17bo3bo25bo3bo58b2o$16b2o3b2o23b2o3b
2o5$24bo29bo85bo$9b2o12bobo13b2o12bobo82b3o$9b2o12b2o14b2o12b2o82bo$132b
2o3b2o$19bo29bo61b2o18bo2bo$10bo7bobo19bo7bobo60bo20b2o$10b3o5bobo19b
3o5bobo58bobo$13bo5bo23bo5bo59b2o43b2o$12b2o28b2o38b2o70bo$5b2o75bo31b
o6b2obo27bobo$5bobo72bobo30bobo5bob2o27b2o$6b2o6bo29bo29bo5b2o22bo8bo
2bo17bo8b2o$2b2o9bob2o26bob2o26bob2o26bob2o7b2o17bob2o5bo2bo$bobo10b2o
28b2o28b2o28b2o28b2o7bobo$bo142bo$2o5$101bo5b2o$73bo5b2o19bobo4bo$72b
obo3bobo20b2o5b3o$73bo3bobo30bo$78bo7$49bo14bo$48bobo13b3o$48bob3o14b
o$45b2obo4bo12b2o11b2o$45bobobobobo26bo$47bobob2o4b2o11b2o8bob2obo$46b
obo8bo12b2o7b2obob2o$47bo7bobo8b2o$55b2o8bo2bo10b3o$66b2o11bo2bo$14bo
29bo29bo6b2o$13bob2o26bob2o26bob2o$14b2o28b2o28b2o3$7b2o$3b2obobo10b2o
b2o$bo2bob2o8bobob2obo$b2o12bob2o$13b3o3bob2o$7b2o3bo3b3o3bo$3b2o2b2o
4bobo3b3o$2bobo7b2ob2o2bo$2bo$b2o!

[muzik]

How many phi-sparkers are known other than the pentadecathlon, Tanner's p46, and perhaps arrangements of guns that create phi sparks via spaceship collisions? Oscillators such as 22P36 don't count as the sparks are far too internal to be of any use.

On a similar line, are there any known oscillators that create line-of-six sparks, obviously discounting the worker bee and its relatives and 66P13 due to the sparks being effectively in the center?

[GUYTU6J]

How many phi-sparkers are known other than the pentadecathlon, Tanner's p46, and perhaps arrangements of guns that create phi sparks via spaceship collisions? Oscillators such as 22P36 don't count as the sparks are far too internal to be of any use.

Here are two:

Cross-posting things found in the last few days: a p40 B hassler, a p80 century hassler (reduced by hotdogpi), p63 century hassler, and a p112 R shuttle
...

A substantial reduction to the p63:

Code: Select all

x = 47, y = 34, rule = B3/S23
6b2o16b2o$7bo16bo$7bobo12bobo$8b2o12b2o$13bo4bo$11b2ob4ob2o9bo$13bo4bo
11b3o$8b2o12b2o9bo$7bobo12bobo7b2o$7bo16bo$6b2o16b2o$2o$bo14b2o$bobo
10bo2bo$2b2o10b3o$15bo3$31bo$30b3o10b2o$29bo2bo10bobo$29b2o14bo$45b2o$
21b2o16b2o$22bo16bo$13b2o7bobo12bobo$13bo9b2o12b2o$14b3o11bo4bo$16bo9b
2ob4ob2o$28bo4bo$23b2o12b2o$22bobo12bobo$22bo16bo$21b2o16b2o!

Apologies for the double-post, but here's a major reduction to the period-57 glider gun (from 86x74 to 68x67) by finally finding a way to generate a glider stream without needing a glider loop whatsoever:

Code: Select all

x = 68, y = 67, rule = B3/S23
24b2o3b2o5b2o$19bo3bobo4bo5b2o$18bobobo2bob3o$19b2ob2obobo$21bo$17b8o
2bo32b2ob2obo$16bo6bo3bo28b3ob4ob2o$15bob2obo2b3o35bo$15bo3bo2bob2ob2o
28b2o$14b2o2bo3bob2o29bo3b5o$18bo3bo3bobo28b2o2b2obo$18b2o5bo2bo7bo14b
5o3b2o$16bobobo2bo3bo7b3o21b3o2bobo$9bo5bobo2b4ob3o2bo3b2o2bo12bo2b2o
3b4o3bo$7b3o3b3obobo5b3o2bo3b2ob3o11bo3bobo5b3o$6bo5bo3bo2bo2b2o3bo6b
5o13bo6b4o$5bob2obo2b3o3bobobobo2bo7bo8bo8bo2b2o5b2o$2bo2bo5b2o7b2o2bo
bobo14b5o6bob3obobobo$bobobobobo4b4o4bobob5o11b3ob2o3bo2b2o3bo2bobo$2b
2obobo4b2o4bo3bo2bo5bo11bo2b2o3bo2b2o3bo2bobob2o$6b2obo3bo2b2o2bobo3b
5o13b3o7bob3obobobo2bo$2b2o2b2o2bo2bobo2b3ob2o4bo16bo8bo2b2o5b2o$bobo
2bo3b4ob2o35bo6b4o$o2bobo3b2o6b2o32bo3bobo5b3o$5ob2obo2b4o3bo31bo2b2o
3b4o3bo$5b2o3bo6b2obo38b3o2bobo$2b2o2b4o8bobo30b5o3b2o$2bo5bob8o2b2o
12b2o21b2o2b2obo$obo9b4o2bobo14bo19bo3b5o$2o16bobo14bobo19b2o$19bo16b
2o12b2o9bo$50b2o4b3ob4ob2o$60b2ob2obo$10b2o15bo$9bobo15b3o10b3o$2o7bo
20bo8bo3bo$2o7b3o2bo14b2o8bo3bo5b2o3b2o$12b2obo24b3o6bobo2b2o$12b2obo
34b2o$14bo19bo2bo$18bo14b2o2b2o11b2o3b2o$17bob2o13bo2bo12bo4bo$17bob2o
31bo3b3o$18bo2b3o27b2o5bo$23bo$21bobo$21b2o2$36b2o$30b2o4bobob2o$11bob
o10bobo3b2o5b2obo2bo8bo$10bob2obob4obob2obo14b2o9bo$13b12o26b3o$11bob
2o8b2obo9b2o$9b3o14b3o7b2o2b2o$6bo2b2o2bo3b4o3bo2b2o2bo8bobo$6b3ob3o4b
4o4b3ob3o10bo$8bo3b2obo6bob2o3bo12b2o$5bo4bob2obo2b2o2bob2obo4bo$5bo3b
o5bobo2bobo5bo3bo$6bobo3bo2bobo2bobo2bo3bobo$6bo3b4ob8ob4o3bo$5b2o3b2o
2bo8bo2b2o3b2o$5bo4b3obob6obob3o4bo$6bo5bobobo4bobobo5bo$5b2o5b2o5bo4b
2o5b2o$19b2o!

The second one is adapted from an R-pentomino factory. If it counts, then the following p129 would count too:

Code: Select all

x = 64, y = 44, rule = B3/S23
37bo$37b3o$40bo$10bo28b2o$9bobo50b2o$9bobo50bo$7b3ob2o47bobo$6bo53b2o$
7b3ob2o29bobo$9bob2o29bo2bo$42bo2bo$43b2o2$5b2o$5b2o3$18b2o$17bo2bo$
17bo2bo$18bobo2$bo$obo$2o$22b2o$5b2o15bo$5bobo15b3o$6bo18bo4$22b2o$22b
o$20bobo$6b2o12b2o$6b2o$b2o$2bo10b2o$2bobo5b2o2bo$3b2o2bo6bo$7bo5bo$6b
o2bo2b2o$6b2o!

EDIT: I saw another period-120 honey farm hassler from the collection that has one half of the phi spark slightly but necessarily perturbed to support the main engine

Code: Select all

x = 50, y = 27, rule = B3/S23
29bo5bo$29b2o3b2o$22b2o5b2o3b2o$22b2o6bo3bo$b2o$2bo$2bobo$3b2o38bo$41b
3o$40bo$16b3o21b2o6b2o$48bo$32b2o12bobo$2b2o11bo2bo12bo2bo11b2o$bobo
12b2o$bo$2o6b2o21b3o$9bo$6b3o$6bo38b2o$45bobo$47bo$47b2o$15bo3bo6b2o$
14b2o3b2o5b2o$14b2o3b2o$14bo5bo!

[Bullet51]

Is it proven that there are no still-life glider eaters with recovery time 3? If yes, we may change the sentence

The smallest known recovery time is 4 generations, attained by eater 1.

on the LifeWiki page Eater into

The smallest possible recovery time is 4 generations, attained by eater 1.

.


A similar problem is that is it proven whether a period-2 c/2 spaceship has at least 64 cells. LifeWiki claims

In terms of its 64 cells, it is the smallest period 2 spaceship

.

LifeWiki uses pentadecathlon.com as a reference, but the reference also lists 46P4H1V0.1, 67P5H1V1.1 and the 3-engine cordership as the smallest within their respective speeds, which is false.

There is a similar problem about 25P3H1V0.1 and 25P3H1V0.2.

With 25 cells, it is tied with 25P3H1V0.1 as the smallest c/3 spaceship.

Is it proven that a period-3 c/3 spaceship has at least 25 cells?

[dvgrn]

A similar problem is that is it proven whether a period-2 c/2 spaceship has at least 64 cells. LifeWiki claims

In terms of its 64 cells, it is the smallest period 2 spaceship

.

LifeWiki uses pentadecathlon.com as a reference, but the reference also lists 46P4H1V0.1, 67P5H1V1.1 and the 3-engine cordership as the smallest within their respective speeds, which is false.

There is a similar problem about 25P3H1V0.1 and 25P3H1V0.2.

With 25 cells, it is tied with 25P3H1V0.1 as the smallest c/3 spaceship.

Is it proven that a period-3 c/3 spaceship has at least 25 cells?

It seems to me that the word "known" is implied in both of those sentences, just not stated. I guess we could either add "known" to both sentences, or start some difficult philosophico-mathematical arguments about whether or not Life spaceships exist when they haven't been discovered yet.

I don't think that it's going to be possible to definitively rule out the existence of weird unlikely c/3 things with low population, any more than weird unlikely c/137 things with low population. Below some population it's going to be really unlikely that anything is going to travel fast enough to reconstitute itself at time T, T/3 cells away -- but as soon as you get past the point where it's possible to exhaustively enumerate and test all possible combinations of N cells in the largest possible bounding box that might be relevant, it seems like it will be very hard to come up with any kind of workable proof.