WOLFRAM NOTEBOOK

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{807,3607,4551,6283,6927,7096,9618,10116,11845,11918,12472,14286,14433,15031,15969,16616,19320,19951,22321,23957,26011,26184,26208,26540,26909,27509,27889,29984,31763,35863,36566,37467,38295,38374,38403,46638,47303,48276,49232,50265,50539,51466,52578,53416,54471,55460,56706,56848,57817,58102,58498,58779,58905,59202,59581,59834,60454,62895,63385,63718,64047,64170,64292,65246,65462,66776,67761,67939,69158,69459,70234,71860,72032,72215,72303,72751,73199,73463,73910,74020,74177,75035,75800,76050,76358,76837,78575,81014,81232,81380,81440,81644,81698,81949,82805,86155,86553,87033,87188,87840,88080,88301,88810,88975,89036,89064}
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{February 12 : Keith Amling discovers the first 2c/5 orthogonal chicken wire greyship .,February 8 : iNoMed constructs a record-breaking small period-80 HWSS gun based on a new p80 R-pentomino hassler by Caleb R. Hilton . This gun has the unusual property of being gliderless .,February 7 : Matthias Merzenich uses Logic Life Search to reduce the p28 glider gun , making it the tenth period with a true-period gun smaller than the single-barreled Simkin glider gun .,February 6 : Matthias Merzenich uses Logic Life Search to complete a single-engine p57 glider gun based on a partial result by ElijahKen . Subsequent reductions by Merzenich, ElijahKen, iNoMed , and vilc result in a single-engine gun that is 45% smaller than the previous 2-engine gun.,February 3 : Keith Amling discovers and vilc synthesises a new 32-cell 2c/4 orthogonal spaceship.}
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Overall History

Period 15 glider gun

Closest conceivable [ true period ] : 14 (still unsolved)
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Conduits

Moves a fixed object....
(Moves it once and then blows up...)
[[[ Plus generates lots of junk; large part of tech is dealing with junk ]]] ( challenge is to put a harness )

Reflector

Previous reflector were not static, but periodic ... (e.g. glider gun could be a reflector, but only in the correct phase)

Spacefiller

Universal Computation

[ Self Supporting Spaceships ]

Objects that are built by constructions:
Net effect: moves by 31 cells in 240 steps

Universal Construction

Glider-based construction systems ....

Metacells

This one does GoL
OTCA metapixel: can do any rule

What does this contain?

Ed says: Gosper glider guns [variant using eaters], gliders, lightweight spaceships, eaters, pentadecathlons, loafs
Also : sparker oscillator

Development of constructions

Initially: relied a lot on the phase .. Later: (stable reflector ...) enabled smaller constructions that didn’t require phase synchronizations....
Constructions could have been made earlier, but they were bigger

Constructed oscillator

Checking oscillators

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