For discussion of specific patterns or specific families of patterns, both newly-discovered and well-known.

I noticed that one of Tim Coe's new p8 c/4 orthogonal ships has an isolated p8 spark:
x = 31, y = 15, rule = B3/S2310b2o6bo10bo$5b3o2b3o15b2o$7bo2b2obobo11b2obo$5b2o5b3o8b2obobobo$b2o2bo2b3obo3b5o5b2o2bo$2ob2o5bo4b2o5bo4b2obo$bo3bo9bo6bo2bo2b2o$2o3bo17bo2bob3o$bo3bo9bo6bo2bo2b2o$2ob2o5bo4b2o5bo4b2obo$b2o2bo2b3obo3b5o5b2o2bo$5b2o5b3o8b2obobobo$7bo2b2obobo11b2obo$5b3o2b3o15b2o$10b2o6bo10bo!

I had thought that this spark was period-4. Using a known trick, I isolated the spark further. This allowed a small interaction with the block deletion in the p20 and p28 ships, resulting in nontrivial p40 and p56 ships:
x = 171, y = 201, rule = B3/S23108bo10bo20bo10bo$108bo10bo20bo10bo$107bobo8bobo18bobo8bobo2$110bo6bo24bo6bo$106b4obo4bob4o16b4obo4bob4o$108b2obo4bob2o20b2obo4bob2o$106bo3bo6bo3bo16bo3bo6bo3bo$105bo16bo14bo16bo$104bo18bo12bo18bo$105bobo12bobo14bobo12bobo$108b2o8b2o20b2o8b2o$107b4o6b4o18b4o6b4o$110bo6bo24bo6bo$106bo14bo16bo14bo$106b2o3b2o2b2o3b2o16b2o3b2o2b2o3b2o$106b2o3b2o2b2o3b2o16b2o3b2o2b2o3b2o2$111bo4bo26bo4bo$110b3o2b3o24b3o2b3o$108b2ob2o2b2ob2o20b2ob2o2b2ob2o2$111bob2obo26bob2obo$107b14o18b14o$111bob2obo26bob2obo2$106b4o8b4o16b4o8b4o$106bob2o8b2obo16bob2o8b2obo$106b4o8b4o16b4o8b4o$107b2o10b2o18b2o10b2o$109b2o6b2o22b2o6b2o$105bo4b2o4b2o4bo14bo4b2o4b2o4bo$105bo16bo14bo16bo$104bobobo10bobobo12bobobo10bobobo$104bob2obo8bob2obo12bob2obo8bob2obo$110bo6bo24bo6bo$109bo8bo22bo8bo$112bo2bo28bo2bo$109bo2b4o2bo22bo2b4o2bo$110bo2b2o2bo24bo2b2o2bo$111b2o2b2o26b2o2b2o$112b4o28b4o$111b2o2b2o26b2o2b2o$110bo6bo24bo6bo$110bo2b2o2bo24bo2b2o2bo$109b2o6b2o22b2o6b2o$109b3ob2ob3o22b3ob2ob3o$111b2o2b2o26b2o2b2o2$108b2ob2o2b2ob2o20b2ob2o2b2ob2o$109bobob2obobo22bobob2obobo$106b4o8b4o16b4o8b4o$105bo5bo4bo5bo14bo5bo4bo5bo$108b2obo4bob2o20b2obo4bob2o$109b2o6b2o22b2o6b2o$105b3ob10ob3o14b3ob10ob3o$111b2o2b2o26b2o2b2o$106b3o3bo2bo3b3o16b3o3bo2bo3b3o$106b6o4b6o16b6o4b6o$107b3o8b3o18b3o8b3o$111b2o2b2o26b2o2b2o$120b4o12b4o$119bo3bo12bo3bo2$119bo2bo14bo2bo$118b3o18b3o2$117bo24bo$118bo22bo$27bo88b2obo20bob2o$27bo88b2o2bo18bo2b2o$26bobo86bo2b2o20b2o2bo$110b3o6bo20bo6b3o$25bo68bo16bo36bo16bo$24bob4o64bo25b2o16b2o25bo$24bobob2o63bobo16bo6bo20bo6bo16bobo$25bob2o2bo77b4o5b2o2bo14bo2b2o5b4o$27bo3bo64bo11b3o8b2obo3bo2b2o2bo3bob2o8b3o11bo$27b2o63b4obo9bo2bo10b2o2b2ob4ob2o2b2o10bo2bo9bob4o$26bobob3o59b2obobo8b2obo13bo12bo13bob2o8bobob2o$23b2ob2o3b2o57bo2b2obo8bo8bo11bobo2bobo11bo8bo8bob2o2bo$24b3o63bo3bo9bo5bo2bobo9b4o2b4o9bobo2bo5bo9bo3bo$26bo66b2o13bob3o3bo8b10o8bo3b3obo13b2o$24bo2bo6bo54b3obobo8b3o2bo2bob2o28b2obo2bo2b3o8bobob3o$23bobob2o4b3o53b2o3b2ob2o62b2ob2o3b2o$28bo4b2obobo56b3o18b2o24b2o18b3o$23bo3bo8bob2o55bo22bo22bo22bo$40bobo51bo2bo18b2o2b2o7b2o7b2o2b2o18bo2bo$26b2o8bo4b2o50b2obobo20bo2bo6b2o6bo2bo20bobob2o$26bob2o6bo6bo49bo25bo2bo14bo2bo25bo$26b2obo7bo2b2o52bo3bo20b2ob2o12b2ob2o20bo3bo$26b2o80bo11bob2o12b2obo11bo$26b3o12b2o51b2o10b3o3bo5bo2b3o12b3o2bo5bo3b3o10b2o$26b3o10bo52b2obo9bo3bo2b4o2b2o2bo14bo2b2o2b4o2bo3bo9bob2o$28bo9bo2bo50bob2o9bo2bo3bo7bobo14bobo7bo3bo2bo9b2obo$26bob2o9bobo52b2o12b2o3b2o2b5o7b2o7b5o2b2o3b2o12b2o$19bo8bo8b2o54b3o4bo4bobo21b2o21bobo4bo4b3o$18b3o7b2o63b3o4b4ob2o3bo38bo3b2ob4o4b3o$18b3o17bo54b3o4bob3o3bobo5b5o18b5o5bobo3b3obo4b3o$20bo9bo7bo54bo9bo4bobo6bobobo16bobobo6bobo4bo9bo$17b4o8bo8b3o51b2obo4bo13b2obobobo16bobobob2o13bo4bob2o$16bobob2o7bo9b2o52bo19bo2bo3bo18bo3bo2bo19bo$16bo5bo16bo52b2o35b2o35b2o$21b2o6b2o6bo75bobo13b2o13bobo$20bo2bo5b2o8bo54bo20bo28bo20bo$17b2obobo12b2o2bo53bo20b3o26b3o20bo$16b3obo3b2o3b2o3bobo56bo16b4o2bo26bo2b4o16bo$15bo6bo6b2o7b2o70b2o3bo28bo3b2o2$18b3o21bo10bo75b2o11bo10bo$15b2o24b3o8b3o74b2o10b3o8b3o$15b2o4bo7b2o10b3o8b3o86b3o8b3o$18bobo8b2o10bo12bo86bo12bo$17b2o22b4o6b4o86b4o6b4o$18bobo19b2obobo4bobob2o84b2obobo4bobob2o$17bo2bo24bo4bo94bo4bo$17bobobo7b2o13bo6bo77b2o13bo6bo$16b3o10b2o7b3o14b3o71b2o7b3o14b3o$16b3o19b3o14b3o80b3o14b3o$17b2o21b2o12b2o84b2o12b2o$17b2o22bobo8bobo86bobo8bobo$19b3o7b2o9b3ob2o4b2ob3o84b3ob2o4b2ob3o$29b2o11b4o4b4o88b4o4b4o$40b3ob3o2b3ob3o73b2o9b3ob3o2b3ob3o$20b2o17bo4bo6bo4bo72b2o8bo4bo6bo4bo$20b2o18bo3bo2b2o2bo3bo84bo3bo2b2o2bo3bo$21b2o6b2o16b2o98b2o$29b2o13bobo2bobo92bobo2bobo$43bo2bo2bo2bo90bo2bo2bo2bo$43bob6obo90bob6obo$42bo2bob2obo2bo75b2o11bo2bob2obo2bo$29b2o11bo2b2o2b2o2bo75b2o11bo2b2o2b2o2bo$29b2o10bo12bo86bo12bo$44bo6bo92bo6bo$41bo2bo6bo2bo86bo2bo6bo2bo$40b4o8b4o84b4o8b4o$29b2o8b2o14b2o82b2o14b2o$29b2o8b2o14b2o72b2o8b2o14b2o$41bo2b2o4b2o2bo74b2o10bo2b2o4b2o2bo$42bo10bo88bo10bo$39bo2bo2bo4bo2bo2bo82bo2bo2bo4bo2bo2bo$29b2o7bob2ob2o6b2ob2obo80bob2ob2o6b2ob2obo$29b2o7bo3b2o8b2o3bo80bo3b2o8b2o3bo$39b2o3bo6bo3b2o82b2o3bo6bo3b2o$44bo6bo77b2o13bo6bo$43bo8bo76b2o12bo8bo$29b2o14b2o2b2o94b2o2b2o$29b2o14b2o2b2o94b2o2b2o$44bobo2bobo92bobo2bobo2$45b2o2b2o94b2o2b2o$29b2o14b2o2b2o78b2o14b2o2b2o$29b2o13bo2b2o2bo77b2o13bo2b2o2bo$44bo6bo92bo6bo$44b8o92b8o$45bo4bo94bo4bo$29b2o13b3o2b3o92b3o2b3o$29b2o12b2o6b2o90b2o6b2o$43bobo4bobo76b2o12bobo4bobo$7bo37bo4bo56bo21b2o14bo4bo$6bobo12b2o17b3o3b4o3b3o50bobo12b2o17b3o3b4o3b3o$5bo4bo10bo2b2o3b2o9bo3bo6bo3bo49bo4bo10bo2b2o14bo3bo6bo3bo$3b3o4bo3b2o9bo3b2o9bobo10bobo47b3o4bo3b2o9bo14bobo10bobo$3b2o2b2obo2bo3bobo3b2obo13bo3bob4obo3bo47b2o2b2obo2bo3bobo3b2obo13bo3bob4obo3bo$3b2o4bo3bo3b3o19b2ob2o3b2o3b2ob2o46b2o4bo3bo3b3o19b2ob2o3b2o3b2ob2o$8bo5b2o5bo4bo12b5o3b2o3b5o51bo5b2o5bo4bo2b2o8b5o3b2o3b5o$9bo4bob5o4bo3b2o5bo7b2o4b2o57bo4bob5o4bo3b2o5bo7b2o4b2o$18b2o5bo3b2o5bo8b2o2b2o67b2o5bo10bo8b2o2b2o$35bobo7bo4bo84bobo7bo4bo$21b2o16bobo79b2o16bobo$bo18bobo17bo60bo18bobo17bo$3o9bo6b3o7b2o5b3ob2o58b3o9bo6b3o14b3ob2o$3o5b4o2bo5b2o7b2o6b3o2bo57b3o5b4o2bo5b2o7b2o6b3o2bo$2bo4bo3bo3bo4b2o17bo2bo59bo4bo3bo3bo4b2o7b2o8bo2bo$2bob2o4bobo2bo6b3o77bob2o4bobo2bo6b3o$bo3bo7bo25b3o59bo3bo7bo25b3o$5bobob2o2b2ob2o11b2o8bo65bobob2o2b2ob2o21bo$13b5o5b2o4b2o82b5o5b2o$16b2o5b2o11b2o78b2o5b2o11b2o$17b2o3b2o13bob3o75b2o3b2o5b2o6bob3o$36bobo90b2o5bobo$17b2o3b2o5b2o4b3o79b2o3b2o11b3o$29b2o4bobo97bobo$18b2ob2o11bo3b3o77b2ob2o11bo3b3o$16b2obobob2o14b2o75b2obobob2o14b2o$15bo3bobo3bo8b3o78bo3bobo3bo8b3o$14bo2b2o3b2o2bo2bobo2bo2bo76bo2b2o3b2o2bo2bobo2bo2bo$17bo5bo5bobo2bo82bo5bo5bobo2bo$13bo3bo5bo3bo2bo3bo78bo3bo5bo3bo2bo3bo$17bo5bo10bo3bo78bo5bo10bo3bo$17bo5bo11bo2bo78bo5bo11bo2bo$35bo99bo$18b2ob2o14b2o79b2ob2o14b2o$16bo3bo3bo91bo3bo3bo$16bo7bo12b2o77bo7bo12b2o$19bobo16bo80bobo16bo$16b2o2bo2b2o91b2o2bo2b2o$15bob2o3b2obo12b2o75bob2o3b2obo12b2o$14b3ob5ob3o87b3ob5ob3o$13b2o4b3o4b2o85b2o4b3o4b2o$15b4obob4o89b4obob4o! The reason for all of these c/4 orthogonal results is that I have been working on my update to jslife, and have added a c/4 orthogonal extended collection. Looking back through old technology gave me some new ideas. I am now done updating all of the collections of moving objects in jslife except c/3 orthogonal. Also, thanks to Dave Greene's Life Lexicon update, I noticed this c/4 orthogonal ship (by Nicolay Beluchenko) that should have been in the small ships collection: x = 25, y = 23, rule = B3/S2322b3o2$22bobo2$20b2o$19bobo$17bob2o$16b2o3bo$11b3o$14b2o2bobo$12bo6bo$11bo$9bobo$8bob2o$8b2o$9bo$bo5bobo$bo7bo$obo4bob2o$10bo$5bob3o$b5obo$2b2o2bo! This leads to another small ship based on known components: x = 28, y = 19, rule = B3/S2319bo$17bo3bo$17bo3b2o$16b2o5b2o$11b3o4bo6bo$14b2o3bo3b3o$12bo6bo3bob2o$11bo10bo$9bobo15bo$8bob2o14bo$8b2o16bo$9bo$bo5bobo$bo7bo$obo4bob2o$10bo$5bob3o$b5obo$2b2o2bo! I also forgot to previously include this tagalong to the 37-cell ship (it was included only as a tagalong to the 41-cell ship): x = 26, y = 22, rule = B3/S23bo$bo8bo$obo5bo3bo$8bo3b2o$5bob2o5b2o$b6o2bo6bo$2b2o6bo3b3o$10bo3bob2o4b3o$13bo9bo$18bo$17bo5bo$16bo2bo2bobo$22b3o$17b5obobo$24bo$17b3o4b2o$17bobo$17bob2o2$21bo$20bo$20bo! -Matthias Merzenich Sokwe Moderator Posts: 1132 Joined: July 9th, 2009, 2:44 pm ### Re: Spaceship Discussion Thread Three new c/6 pushalongs based on known components: x = 98, y = 119, rule = B3/S232bobo9bobo26bobo9bobo22bobo9bobo$2o3b2o5b2o3b2o22b2o3b2o5b2o3b2o18b2o3b2o5b2o3b2o$2o3b2o5b2o3b2o22b2o3b2o5b2o3b2o18b2o3b2o5b2o3b2o$5b2o5b2o32b2o5b2o28b2o5b2o$4b2o7b2o30b2o7b2o26b2o7b2o$3b2o9b2o28b2o9b2o24b2o9b2o$3bo11bo28bo11bo24bo11bo$4bo9bo30bo9bo26bo9bo$5b2o5b2o32b2o5b2o28b2o5b2o2$7bo3bo36bo3bo32bo3bo$4bobo5bobo30bobo5bobo26bobo5bobo$2bobo9bobo26bobo9bobo22bobo9bobo$2bobo9bobo26bobo9bobo22bobo9bobo$2b2o11b2o26b2o11b2o22b2o11b2o2$3o4bo3bo4b3o22b3o4bo3bo4b3o18b3o4bo3bo4b3o$b2o4bo3bo4b2o24b2o4bo3bo4b2o20b2o4bo3bo4b2o$b3obobo3bobob3o24b3obobo3bobob3o20b3obobo3bobob3o$4b3o5b3o30b3o5b3o26b3o5b3o$3b2o2bo3bo2b2o28b2o2bo3bo2b2o24b2o2bo3bo2b2o$5b2o5b2o32b2o5b2o28b2o5b2o$6bo5bo34bo5bo30bo5bo2$4b2ob2ob2ob2o30b2ob2ob2ob2o26b2ob2ob2ob2o2$7bo3bo36bo3bo32bo3bo$5bobo3bobo32bobo3bobo28bobo3bobo$3bobo2bobo2bobo28bobo2bobo2bobo24bobo2bobo2bobo$7bo3bo36bo3bo32bo3bo$2bo2b3o3b3o2bo26bo2b3o3b3o2bo22bo2b3o3b3o2bo$2bobo2bo3bo2bobo26bobo2bo3bo2bobo22bobo2bo3bo2bobo$3bobob2ob2obobo28bobob2ob2obobo24bobob2ob2obobo$4b2o2bobo2b2o30b2o2bobo2b2o26b2o2bobo2b2o2$8bobo38bobo34bobo$3b2o3bobo3b2o28b2o3bobo3b2o24b2o3bobo3b2o$ob2o4bobo4b2obo22bob2o4bobo4b2obo18bob2o4bobo4b2obo$3o4bo3bo4b3o22b3o4bo3bo4b3o18b3o4bo3bo4b3o$obo13bobo22bobo13bobo18bobo13bobo$b2o3bo5bo3b2o24b2o3bo5bo3b2o20b2o3bo5bo3b2o$bo4bo5bo4bo24bo4bo5bo4bo20bo4bo5bo4bo$2b2obo7bob2o26b2obo7bob2o22b2obo7bob2o$5bo7bo32bo7bo28bo7bo$4b2ob2ob2ob2o30b2ob2ob2ob2o26b2ob2ob2ob2o$6bobobobo34bobobobo30bobobobo$3bo2bobobobo2bo28bo2bobobobo2bo24bo2bobobobo2bo$4bo3bobo3bo30bo3bobo3bo26bo3bobo3bo$5bobo3bobo32bobo3bobo28bobo3bobo$2b2o11b2o26b2o11b2o22b2o11b2o$bobob2o5b2obobo24bobob2o5b2obobo20bobob2o5b2obobo$o4bob2ob2obo4bo22bo4bob2ob2obo4bo18bo4bob2ob2obo4bo$b2o3b3ob3o3b2o24b2o3b3ob3o3b2o20b2o3b3ob3o3b2o$2o5b2ob2o5b2o22b2o5b2ob2o5b2o18b2o5b2ob2o5b2o$bo15bo24bo15bo20bo15bo$6b3ob3o34b3ob3o30b3ob3o$o2b3ob2ob2ob3o2bo22bo2b3ob2ob2ob3o2bo18bo2b3ob2ob2ob3o2bo$2bob3obobob3obo26bob3obobob3obo22bob3obobob3obo$o5bo5bo5bo22bo5bo5bo5bo18bo5bo5bo5bo$3o4bo3bo4b3o22b3o4bo3bo4b3o18b3o4bo3bo4b3o$b2obob2o3b2obob2o24b2obob2o3b2obob2o20b2obob2o3b2obob2o$3bo2bo5bo2bo28bo2bo5bo2bo24bo2bo5bo2bo$3bo2bo5bo2bo28bo2bo5bo2bo24bo2bo5bo2bo$3b2o9b2o28b2o9b2o24b2o9b2o$4b2o7b2o30b2o7b2o26b2o7b2o$2bob3o5b3obo26bob3o5b3obo22bob3o5b3obo$3b2o2bo3bo2b2o28b2o2bo3bo2b2o24b2o2bo3bo2b2o$4b2o2bobo2b2o30b2o2bobo2b2o26b2o2bobo2b2o$4bo3bobo3bo30bo3bobo3bo26bo3bobo3bo$5b3o3b3o32b3o3b3o28b3o3b3o$3bo11bo28bo11bo24bo11bo$3bobobo3bobobo28bobobo3bobobo24bobobo3bobobo$3bob2o5b2obo28bob2o5b2obo24bob2o5b2obo3$4b2obo3bob2o30b2obo3bob2o26b2obo3bob2o$4b2obobobob2o30b2obobobob2o26b2obobobob2o$3bo4bobo4bo28bo4bobo4bo24bo4bobo4bo$3bobo3bo3bobo28bobo3bo3bobo24bobo3bo3bobo$8bobo38bobo34bobo$4b2o7b2o30b2o7b2o26b2o7b2o2$8b3o38b3o34b2o2bo$88bo$10b2o38b2o$8bo4bo34bo4bo32bo6bo$7bo6bo32bo6bo30bobob2obobo$6bo8bo30bo8bo29b2o2b2o2b2o$6b2ob4ob2o30b2ob4ob2o33b2o2$87b2o2b2o$8b2o2b2o34b2o2b2o33b2o2b2o$8b2o2b2o34b2o2b2o34b4o$88bo2bo$10b2o38b2o35bo4bo$9b4o36b4o34bo4bo$8b2o2b2o34b2o2b2o33bob2obo$8bo4bo34bo4bo34bo2bo$10b2o38b2o36bo2bo$8bo4bo34bo4bo$8bo4bo34bo4bo28bo14bo$3bo14bo24bo14bo23b2o4bo2bo4b2o$2bobo4bo2bo4bobo22bobo4bo2bo4bobo22bo5b4o5bo$5bo3b4o3bo28bo3b4o3bo26b2o4b2o4b2o$2bo16bo22bo16bo24bo10bo$4b2o10b2o26b2o10b2o24bobo10bobo$3b3o10b3o24b3o10b3o24b5o4b5o$8bo4bo34bo4bo31bo2b4o2bo$6b2obo2bob2o30b2obo2bob2o28bo4b2o4bo$6b2o2b2o2b2o30b2o2b2o2b2o32bo2bo$6b2o6b2o30b2o6b2o33b2o$7b2ob2ob2o32b2ob2ob2o31b2ob2ob2o$7b2ob2ob2o32b2ob2ob2o$85bo8bo$84b3o6b3o$5b3o6b3o28b3o6b3o27bo2bo4bo2bo$4bo3bo4bo3bo26bo3bo4bo3bo25b2o10b2o$7bo6bo32bo6bo$4b2o10b2o26b2o10b2o!
x₁=ηx
V ⃰_η=c²√(Λη)
K=(Λu²)/2
Pₐ=1−1/(∫^∞_t₀(p(t)ˡ⁽ᵗ⁾)dt)

$$x_1=\eta x$$
$$V^*_\eta=c^2\sqrt{\Lambda\eta}$$
$$K=\frac{\Lambda u^2}2$$
$$P_a=1-\frac1{\int^\infty_{t_0}p(t)^{l(t)}dt}$$

http://conwaylife.com/wiki/A_for_all

Aidan F. Pierce

A for awesome

Posts: 1355
Joined: September 13th, 2014, 5:36 pm
Location: 0x-1

I've finally completed my update of the jslife moving objects collection:
jslife-moving-objects-update-3sep2017.zip

This is a fairly comprehensive collection of elementary-based moving technology. Caterpillars, Caterloopillars, half-baked ships, and Geminoids are not included in this collection.

Please let me know If you find any errors, omissions, or inconsistencies.

I will also include a link to this post at the beginning of the topic.
-Matthias Merzenich
Sokwe
Moderator

Posts: 1132
Joined: July 9th, 2009, 2:44 pm

Sokwe wrote:Please let me know If you find any errors, omissions, or inconsistencies.

Thanks a lot for compiling this collection, it's great to have.

I don't know if this counts as an omission in the strict sense, but one thing I'd love to see is information on who first found which ship, when, and so on, in the same manner as in Dean Hickerson's oscillator stamp collection.

I was just looking for Eppstein's glider glider 16485 (that's 70P2H1V0.1 on Pentadecathlon); found it right away, too, in velocity-c2/c2-extended/c2-0002.rle (again, thanks to everyone!), but as there's no meta-information about any of the ships I'm still in the dark about who first discovered it.
Living proof that a little knowledge is a dangerous thing.

Catagolue: Apple Bottom • Life Wiki: Apple Bottom • Twitter: @_AppleBottom_

Proud member of the Pattern Raiders!

Apple Bottom

Posts: 676
Joined: July 27th, 2015, 2:06 pm

Apple Bottom wrote:I don't know if this counts as an omission in the strict sense, but one thing I'd love to see is information on who first found which ship, when, and so on, in the same manner as in Dean Hickerson's oscillator stamp collection.

I was just looking for Eppstein's glider glider 16485 (that's 70P2H1V0.1 on Pentadecathlon); found it right away, too, in velocity-c2/c2-extended/c2-0002.rle (again, thanks to everyone!), but as there's no meta-information about any of the ships I'm still in the dark about who first discovered it.

Many (perhaps most) patterns in the collection do have that information. That happens to be one of the exceptions. The main reason the information isn't included is that it's just too much work to track down. I spent nearly as much time finding credits for old patterns as I did adding new patterns.

To answer your specific curiosity, 70P2H1V0.1 was found by Hartmut Holzwart sometime in the two weeks preceding 3 July 1992. It was found with the restriction that all on cells have at most 6 on neighbors and all off cells have at most 5 on neighbors. This allows it to work in many different rules, which is probably why David Eppstein included it in his database.

I found the information for this spaceship by first looking at David Bell's article, "Spaceships in Conway's Life (Part 2)" (available from his website). It mentions that Hartmut started searching for p2 ships in June of 1992, and that this specific ship had been found "recently". I then looked at some old email archives to find the specific message in which the ship was posted. Unfortunately, the email archive is not available for public release.
-Matthias Merzenich
Sokwe
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Joined: July 9th, 2009, 2:44 pm

Sokwe wrote:I found the information for this spaceship by first looking at David Bell's article, "Spaceships in Conway's Life (Part 2)" (available from his website). It mentions that Hartmut started searching for p2 ships in June of 1992, and that this specific ship had been found "recently". I then looked at some old email archives to find the specific message in which the ship was posted. Unfortunately, the email archive is not available for public release.

Excellent, thanks for the detective work!

I'm curious, too -- how come the archives aren't available? Wasn't this a public mailing list?
Living proof that a little knowledge is a dangerous thing.

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Apple Bottom

Posts: 676
Joined: July 27th, 2015, 2:06 pm

Apple Bottom wrote:how come the archives aren't available? Wasn't this a public mailing list?

The mailing list was not public. As I understand it, the reason the archives aren't made public is that not everyone on the list has given explicit permission. Since the archives date back to April 1992, it might be hard to even get in contact with some of the members. Dave Greene has more details (sorry Dave).

These archives are basically only useful for finding historical information. Even then, most of the interesting historical information has ended up in publicly-available pattern collections and articles.
-Matthias Merzenich
Sokwe
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Joined: July 9th, 2009, 2:44 pm

A boring p12 c/3 ship:
x = 44, y = 39, rule = B3/S2327b2obo$24b2ob2ob2o$24bo2bobo2bo$18b2o4b2o5bo$18b2ob2o$17bo3b2o$21b2o$3bo11bo12bo11bo$b2obo9bob2o3b2o3b2obo9bob2o$4b2o7b2o6b2o6b2o7b2o$5bo7bo16bo7bo$o2bo4b3o4bo12bo4b3o4bo2bo$4bo9bo14bo9bo$4bo9bo6b2o6bo9bo$6b2obob2o18b2obob2o$2bo2bo7bo2bo10bo2bo7bo2bo$2bo2bo7bo2bo10bo2bo7bo2bo$5bo7bo16bo7bo2$7b5o20b5o$5b2obobob2o16b2obobob2o$5b2obobob2o16b2obobob2o$4bo3bobo3bo14bo3bobo3bo$7b2ob2o20b2ob2o$7b2ob2o20b2ob2o$4bo2bo3bo2bo14bo2bo3bo2bo$3b2ob3ob3ob2o12b2ob3ob3ob2o$5bo7bo16bo7bo$5b3o3b3o16b3o3b3o$5bo2bobo2bo16bo2bobo2bo$5bo7bo16bo7bo$3bobo7bobo12bobo7bobo$2bo2bo7bo2bo10bo2bo7bo2bo$2bo2bo7bo2bo10bo2bo7bo2bo$bo15bo8bo15bo$bo15bo8bo15bo$bo15bo8bo15bo$2bobo9bobo10bobo9bobo$2b2o11b2o10b2o11b2o! -Matthias Merzenich Sokwe Moderator Posts: 1132 Joined: July 9th, 2009, 2:44 pm ### Re: Spaceship Discussion Thread 3c/10 width 7 was negative for all symmetries with zfind-s, this was the best partial: x = 15, y = 29, rule = B3/S234bo5bo$4bo5bo$2b2obo3bob2o2$2bo9bo$4bo5bo$3o2bo3bo2b3o$5obobob5o$b2o3bobo3b2o$3b2obobob2o$6bobo$6bobo$2bo3bobo3bo$2b2o2bobo2b2o$3bo2bobo2bo$4bobobobo$6bobo$ob2o7b2obo$ob2ob2ob2ob2obo$b2o9b2o$5bo3bo2$3o3bobo3b3o$b2o2b2ob2o2b2o3$b4o5b4o$6o3b6o$o2bobo3bobo2bo! Things to work on: - An Isotropic version of All_Speeds - Find more ships in B2ek3-ajny4ajqr5a/S02ack3ackny4aq5y - Find a p4 knightship in a Non-totalistic rule (someone please search the rules) AforAmpere Posts: 213 Joined: July 1st, 2016, 3:58 pm ### Re: Spaceship Discussion Thread 3c/10 was also negative for w8 at all symmetries with zfind-s (v, u, a, and g). This is the longest partial (at even bilateral symmetry: x = 16, y = 37, rule = B3/S234bo6bo$3b2o6b2o$2bo10bo$3b3o4b3o$3bob2o2b2obo$3bobo4bobo$2bobo6bobo$2bo2bo4bo2bo$3b3o4b3o$5bo4bo$3b3o4b3o$2bo2bo4bo2bo$2b4o4b4o$2b2obo4bob2o$3bo8bo$bobo8bobo$b2o10b2o$2bo10bo$3b2o6b2o$2bo2bob2obo2bo$5bo4bo$6b4o$3b3o4b3o$2bo10bo$bo2bo6bo2bo$o14bo$3b2o6b2o2$3b3o4b3o$3ob2o4b2ob3o$obobo2b2o2bobobo$4b3o2b3o$2b3o6b3o$2bob8obo$o2bo8bo2bo$o2bo8bo2bo$3b3o4b3o!
Things to work on:
- An Isotropic version of All_Speeds
- Find more ships in B2ek3-ajny4ajqr5a/S02ack3ackny4aq5y
- Find a p4 knightship in a Non-totalistic rule (someone please search the rules)
AforAmpere

Posts: 213
Joined: July 1st, 2016, 3:58 pm

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