danny wrote:Are spaceships faster than c/3 really impossible in justfriends? Is there a proof?
On a similar vein, what B3 totalistic rules allow C/2? B3478/S15678 seems to only allow speeds up to C/3 orthogonal, but for some reason C/4 diagonal.
danny wrote:Are spaceships faster than c/3 really impossible in justfriends? Is there a proof?
cordership3 wrote:Would it be practical at all to make a version of apgsearch that works in a browser?
danny wrote:1. Could a puffer be made that is kind of like a moving otca metapixel?
1a. With/without leaving behind debris showing every generation
danny wrote:1. Could a puffer be made that is kind of like a moving otca metapixel?
1a. With/without leaving behind debris showing every generation
dvgrn wrote:It takes quite a bit more circuitry to leave a functioning metapixel behind at every cycle, but depending on how complicated a rule you're trying to emulate, it might not be too bad.
x = 45, y = 4, rule = B3/S23
21bo9b2o$2o8b3o8b2o7b3o$b2o9bo7bo2bo6bo2bo6bobobo$bo9b2o8b2o8b2o!
danny wrote:dvgrn wrote:It takes quite a bit more circuitry to leave a functioning metapixel behind at every cycle, but depending on how complicated a rule you're trying to emulate, it might not be too bad.
I meant like a puffer that evolves a pattern specified by gliders or otherwise and puffs its evolution out onto the grid. So it would look like:Code: Select allx = 45, y = 4, rule = B3/S23
21bo9b2o$2o8b3o8b2o7b3o$b2o9bo7bo2bo6bo2bo6bobobo$bo9b2o8b2o8b2o!
Apple Bottom wrote:cordership3 wrote:Would it be practical at all to make a version of apgsearch that works in a browser?
Not entirely impractical, I'd guess, as you could take the current C++ codebase, replace the assembly language bits with C++ code, and then compile the whole shebang for asm.js. (This obviously leaves out a lot of work that would have to be done, still.)
I think the bigger question is: whyever would you want to?
cordership3 wrote:The thing is, I work on a lot of shared computers, where downloading cygwin and other programs to compile apgsearch would be inconvenient for others (or just hard to explain away).
(also, would a .exe for apgsearch be at all practical?)
dvgrn wrote:How exactly are we supposed to use Rule 90 to reproduce all those other "RepetitionPeriods" from that mysterious Wolfram Cloud document? The "in-between" numbers not included in the A268754 sequence are even bigger and more outlandish, on average, than the A268754 values.
@RULE Wolfram90
@RULE Wolfram90
@TABLE
n_states:2
neighborhood:oneDimensional
symmetries:reflect
1,1,1,0
1,1,0,1
1,0,0,0
0,1,1,0
0,1,0,1
0,0,0,0
#C 1-tick predecessor of a period 87381 oscillator
x = 1, y = 1, rule = Wolfram90:T37,1
o!
#C apparently an oscillator or predecessor of an oscillator,
#C with a 7-fold reduction in the default period:
#C 90546471444873528678335943241 = (2^99-1)/7, not
#C 633825300114114700748351602688 = (2^99-1)
x = 1, y = 1, rule = Wolfram90:T199,1
o!
muzik wrote:How many (still lifes, oscillators, spaceships) with exactly 20 or under cells in their minimum phase have not yet come out of b3s23/C1?
muzik wrote:How many (still lifes, oscillators, spaceships) with exactly 20 or under cells in their minimum phase have not yet come out of b3s23/C1?
muzik wrote:Let's see... 1+61+597+3053+11480+35411+99385 comes out to 149988 still lifes, 149989 objects including the loafer, and roughly 154989 including the about 5000 oscillators. Can someone get a Dyson sphere or something over here already?
Macbi wrote:The power output of the sun is about 2^75 times what my computer requires, and my computer does 2^11 soups per second, so we would need about 2^(128 - 11 - 75) seconds, which is 140000 years.
dvgrn wrote:If we run the Dyson sphere for enough years, we might manage to get there before the Sun burns out...
calcyman wrote:Wait, isn't Grover's algorithm very much non-parallelisable? As I understand it, don't you have to perform the Grover rotation gate O(2^128) times in succession and then make a measurement?
dvgrn wrote:And that doesn't even count the famous Pi-R-Squared spaceship*, where two pi grandparents and two R-pentominos, totaling 20 bits in a 55x34 bounding box, happen to interact in just the right way to reproduce a copy of themselves offset by one cell every 137 ticks. That might also have a 16x16 predecessor, but it's also not a foregone conclusion.
* seen briefly in 1974 on a PDP-12 display by Tony Honcho Jarnow, produced from a 128x80 random soup, just before an unfortunate power outage due to tripping on a power cable.
Hooloovoo wrote:dvgrn wrote:And that doesn't even count the famous Pi-R-Squared spaceship*, where two pi grandparents and two R-pentominos, totaling 20 bits in a 55x34 bounding box, happen to interact in just the right way to reproduce a copy of themselves offset by one cell every 137 ticks. That might also have a 16x16 predecessor, but it's also not a foregone conclusion.
* seen briefly in 1974 on a PDP-12 display by Tony Honcho Jarnow, produced from a 128x80 random soup, just before an unfortunate power outage due to tripping on a power cable.
Where can I read more about this? My google-fu has failed me.
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