## Push- and Pull-Ships

For discussion of other cellular automata.

### Push- and Pull-Ships

This a thread for push and pull ships. Examples are below.

Definition:
A pull and push ships are spaceships. They are pattern that must results from a collision of a spaceship (X) with a constellation of still lifes/oscillators (Y). After some generations the pattern recover a state before the collision but shifted along the travel line of the spaceship X. If the resulting ship has the same direction than the spaceship X then we call it push-ship, if it has the opposite direction then pull ship.

I hope this definition is clear and precise.
Push- and pull-ships are somehow related to SMOS.

Orthogonal push-ships (+ X, Y left):
x = 15, y = 6, rule = B2ek3aei4kr5q7c/S02-n3ij4krw5r6ikobo3bo5bobo$3o9b3o4$12bo!
x = 15, y = 6, rule = B2c3ajkn4knry5ci6c7c/S01c2ak3ceknq4aijny5ceij6in2bo3bo7bo$b2o10b2o$obo9bobo3$12bo! Orthogonal pull-ship: x = 15, y = 8, rule = B2cek3acij4nr5an7e/S12ikn3iq4art5cnq6bo$3o3bo$bo10b3o$13bo3$12bo$12bo!
Diagonal push-ship:
x = 15, y = 6, rule = B2ce3ace4rwz5ci6ak/S02ace3aen4iktwy5jnb2o5bo4b2o$obo9bobo4$14bo!
Knight push-ship:
x = 16, y = 7, rule = B2ek3air4jrwy5cnq6c/S12-in3ikq4ijryz5cinr6en7e2bo4b2o$3o12bo$13b3o4$13b2o! 2718281828 Posts: 496 Joined: August 8th, 2017, 5:38 pm ### Re: Push- and Pull-Ships 2718281828 wrote:Push- and pull-ships are somehow related to SMOS. In particular I'd say that oscillators and still lifes are just a special kind of spaceship (in the same way that squares are just a special kind of rectangle). So a push or pull-ship is just a special kind of SMOS. It might be interesting to search for a push or pull ship that goes faster than its constituent ship. Macbi Posts: 566 Joined: March 29th, 2009, 4:58 am ### Re: Push- and Pull-Ships Macbi wrote: 2718281828 wrote:Push- and pull-ships are somehow related to SMOS. In particular I'd say that oscillators and still lifes are just a special kind of spaceship (in the same way that squares are just a special kind of rectangle). So a push or pull-ship is just a special kind of SMOS. I dont think these can be considered as SMOS. SMOS stands for "Spaceships Made of Other Spaceships", and their definition is (according to the wiki) "a spaceship in a cellular automaton, consisting of multiple other spaceships colliding with each other, causing a reaction to place on where all of the spaceships are regenerated separately, but with a displacement value." Since these are not made of multiple spaceships crashing into each other, rather a spaceship crashing into a non-moving object or a constellation of them, I would not consider these "SMOS". If you're the person that uploaded to Sakagolue illegally, please PM me. x = 17, y = 10, rule = B3/S23b2ob2obo5b2o$11b4obo$2bob3o2bo2b3o$bo3b2o4b2o$o2bo2bob2o3b4o$bob2obo5bo2b2o$2b2o4bobo2b3o$bo3b5ob2obobo$2bo5bob2o$4bob2o2bobobo!

(Check gen 2)

Saka

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### Re: Push- and Pull-Ships

Macbi wrote:It might be interesting to search for a push or pull ship that goes faster than its constituent ship.

Here, we go, no problem at all even to go much faster:
x = 15, y = 9, rule = B2cei3any4ir5y/S02ei3ain4aikt6c7e13bo2$12bobo$bo5bo2$obo3$13bo!
x = 16, y = 11, rule = B2ci3ajr4aekrtw5ae6k7c/S1e2ai3ny4ajnz5einq6ac7e13b3o2$13bobo3$7b2o$3o2$obo2$13b2o! x = 16, y = 9, rule = B2cek4aijknt5acj6an8/S01e2ace3cen4nrwyz5aijry6kn714b2o$15bo$13bobo$8bo$b2o$2bo$obo2$14bo!

They can move with orthogonal speeds of at least c/5, the crashing ship (X) can be quite slow, e.g. c/19 in the latter example.

2718281828

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### Re: Push- and Pull-Ships

I think the definition requires some adjustments. We should talk about shifting-ships or something like this, with pull and push ships beeing a special case. As the resulting ship can go in any direction:
x = 16, y = 9, rule = B2-an3n4ajy5q/S012a3cen5c6e13bo$15bo$13bobo$7bo$o$2bo$obo2$13bo! x = 16, y = 8, rule = B2ek3aein4j5nry6c8/S01c2ace3jn4ai5acjk14bo$13b3o$7bo2$bo$3o2$13bo!
x = 16, y = 9, rule = B2k3ai4a5qry7e/S01e2ce3ijnr4eknr5anq6c14bo$13bo$13b3o$7bo$bo$o$3o2$13bo! Edit1: Also rakes exist: x = 27, y = 21, rule = B2-an3acekr4air5enq6i/S12cek3n4krtw5y6ci25bo$25bo4$25bo$24b3o$13bo10b3o$12bobo4$bo5bo$obo4bo17bo$24bobo5$13bo11bo$13bo11bo! 2718281828 Posts: 496 Joined: August 8th, 2017, 5:38 pm ### Re: Push- and Pull-Ships x = 10, y = 5, rule = B2-a3i8/S1e2i3-a4e82bo4bo$9bo$2obo3bo$9bo$2bo4bo! Almost c/2: x = 19, y = 10, rule = LifeHistory7.D3.D$6.DCD.DCD$5.DC2AD2ACD$3.2DAC2.A2.CA2D$3.AC.C2.D2.C.CA$.2D.C.AD.A.DA.C.2D$.2C.A2.A3.A2.A.2C$.CA.2D7.2D.AC$DC2.2A7.2A2.CD$2A15.2A!#C [[ STOP 2 ]]
Hunting

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### Re: Push- and Pull-Ships

The quintessential example:
x = 3, y = 12, rule = B3/S135bo$bo7$bo$bo$obo$obo$obo!
x₁=ηx
V ⃰_η=c²√(Λη)
K=(Λu²)/2
Pₐ=1−1/(∫^∞_t₀(p(t)ˡ⁽ᵗ⁾)dt)

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

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Aidan F. Pierce

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### Re: Push- and Pull-Ships

A for awesome wrote:The quintessential example:
x = 3, y = 12, rule = B3/S135bo$bo7$bo$bo$obo$obo$obo!

I was surprised to find that the rule has two far more common ships:
x = 15, y = 6, rule = B3/S1352bo9bo$b3o7b3o$bobo7bobo$o3bo9bo$bobo10bo$o3bo! EDIT: By over a factor of 55! Life is hard. Deal with it. My favorite oscillator of all time: x = 7, y = 3, rule = B3-r4j/S2-i3o5bo$2o3b2o\$b2ob2o!

Hdjensofjfnen

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### Re: Push- and Pull-Ships

2718281828 wrote:I think the definition requires some adjustments. We should talk about shifting-ships or something like this, with pull and push ships beeing a special case. As the resulting ship can go in any direction:
two contradicting spaceships
more different direction push ships
etc.

Edit1: Also rakes exist:
rakes

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