Difference between revisions of "Salvo"

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{{Glossary}}
 
{{Glossary}}
A '''salvo''' is a collection of [[spaceship]]s (usually [[glider]]s) that are all coming from the same direction.<ref>{{Cite web|url=http://b3s23life.blogspot.com/2006/02/new-results-from-glue-2.html|title=New results from Glue 2|author=Dave Greene|date=February 24, 2006|accessdate=June 13, 2009|publisher=Conway's Life: Work in Progress}}</ref> A salvo is generally aimed at a target to produce a specific [[reaction]] -- for example, in a [[sliding-block memory]] or a [[slide gun]], a salvo might move a [[block]] or other [[still life]] a step closer to the salvo source, or a step farther away.  Or two or more salvos may collide with each other to [[Glider synthesis|construct]] a complex object.
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A '''salvo''' is a collection of [[spaceship]]s (usually [[glider]]s) that are all coming from the same direction.<ref>{{Cite web|url=http://b3s23life.blogspot.com/2006/02/new-results-from-glue-2.html|title=New results from Glue 2|author=Dave Greene|date=February 24, 2006|accessdate=June 13, 2009|publisher=Conway's Life: Work in Progress}}</ref> A salvo is generally aimed at a [[target]] to produce a specific [[reaction]] -- for example, in a [[sliding block memory]] or a [[slide gun]], a salvo might move a [[block]] or other [[still life]] a step closer to the salvo source, or a step farther away.  Or two or more salvos may collide with each other to [[glider synthesis|synthesize]] a complex object.
  
A '''slow salvo''' is a salvo in which the spaceships are far enough apart that any collision reaction affecting the n<sup>th</sup> spaceship has settled down by the time the (n+1)<sup>st</sup> spaceship arrives.
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==Classification==
  
A '''P1 slow salvo''' is a slow salvo in which the intermediate settled-down stages are all period 1 (i.e., stable.)  It is conjectured that any glider-constructible object can be produced by a P1 slow salvo aimed at a single block or other small still life -- though the number of gliders needed may be very large.
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===Synchronized/Asynchronous===
  
Conversely, a '''P2 slow salvo''' may have intermediate stages containing P2 oscillators, allowing constructions with significantly fewer gliders on averageP3 and higher slow salvos are technically possible, but higher periods do not appear to make much difference to construction efficiency in Life, where higher-period oscillators only appears rarely.
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A '''[[synchronized]] salvo''' is a salvo in which the target reaction requires all spaceships to be in specific locations and timings relative to each otherA different, and probably less useful, construction reaction will occur if any single spaceship arrives at the construction site even a few [[tick]]s too soon or too late.
  
A '''monochromatic slow salvo''' is a slow salvo which contains only gliders of a single [[glider#Colour of a glider|color]].<ref>{{Cite web|url=http://conwaylife.com/forums/viewtopic.php?f=11&t=1346&p=11688#p11688|title=Re: Serizawa - Linear Self Replicator.|author=Dave Greene|date=April 18, 2014|accessdate=July 29, 2014}}</ref> For example, [[half-baked knightship]]s reconstruct their glider seed constellations using monochromatic slow salvos.
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By contrast, a '''slow salvo''' is a salvo in which the individual spaceships are far enough apart that precise timing becomes irrelevant (i.e. they are [[asynchronous]]). Any collision reaction affecting the n<sup>th</sup> spaceship has settled down into a stable or [[period]]ic intermediate target, by the time the (n+1)<sup>st</sup> spaceship arrives.
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===P1/P2===
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A '''[[P1]] slow salvo''' is a slow salvo in which the intermediate settled-down stages are all period 1 (i.e., stable.)  It is conjectured that any glider-constructible object can be produced by a P1 slow salvo aimed at a single block or other small still life -- though the number of gliders needed may be very large.
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Conversely, a '''P2 slow salvo''' may have intermediate stages containing P2 oscillators, allowing constructions with significantly fewer gliders on average. P3 and higher slow salvos are technically possible, but higher periods do not appear to make much difference to construction efficiency in Life, where higher-period oscillators are relatively rare in random ash.
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:* If a P1 slow salvo is divided into two parts, the later group of gliders can always be delayed by any number of ticks relative to the earlier group, without changing the eventual construction reaction.  In the P2 case, it is generally only safe to delay such a group by an even number of ticks -- though there will be exceptions for any specific gliders that are aimed at P1 intermediate targets.
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===Monochromatic/monoparity===
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A '''monochromatic salvo''' is a [[slow salvo]] that uses [[glider]]s of only one [[colour of a glider|color]].<ref name="post11688" /> For example, the slow salvos generated by [[half-baked knightship]]s are monochromatic, because they are generated by a single type of reaction which can happen at any position along a diagonal line. The smallest possible step size is one [[full diagonal]] (1fd), which is two [[half diagonal]]s (2hd), which means that any single glider-producing reaction can only reach half of the available glider [[lane]]s.
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Similarly, a '''monoparity slow salvo''' is a slow salvo which contains only gliders of the same shape -- i.e., even or odd [[parity]].  The intermediate targets for this type of slow salvo can be P1 or P2, but P2 targets have two completely separate and non-interchangeable [[phase]]s.  A phase-0 blinker is a different target than a phase-1 blinker, for example, and the two targets would require completely different construction recipes. Even-step variants of the [[caterloopillar]] use slow salvos that are both monochromatic and monoparity.<ref name="post20789" />
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===Freeze-dried===
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A '''[[freeze-dried]] salvo''' (or sometimes '''frozen salvo''') is a [[dormant]] [[constellation]] of objects, which, being [[trigger]]ed by a glider or activated by other means, produces a slow salvo with required parameters. In other words, a freeze-dried salvo is essentially a slow salvo [[seed]].<ref name="post35130" />
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==See also==
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* [[Convoy]]
  
Similarly, a '''monoparity slow salvo''' is a slow salvo which contains only gliders of the same shape -- i.e., even or odd parity.  The intermediate targets for this type of slow salvo can be P1 or P2, but P2 targets have two completely separate and non-interchangeable phases.  A phase-0 blinker is a different target than a phase-1 blinker, for example, and the two targets would require completely different construction recipes.  Even-step variants of the [[engineless Caterpillar]] use slow salvos that are both monochromatic and monoparity.<ref>{{Cite web|url=http://www.conwaylife.com/forums/viewtopic.php?f=2&t=1448&start=150#p20789|title=Re: David Bell's engineless caterpillar idea revisited|author=Michael Simkin|date=June 26, 2015|accessdate=August 4, 2015}}</ref>
 
 
==References==
 
==References==
<references />
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<references>
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<ref name="post11688">{{LinkForumThread
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|format = ref
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|title  = Re: Serizawa - Linear Self Replicator
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|p      = 11688
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|author = Dave Greene
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|date  = April 18, 2014
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}}</ref>
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<ref name="post20789">{{LinkForumThread
 +
|format = ref
 +
|title  = Re: David Bell's engineless caterpillar idea revisited
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|p      = 20789
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|author = Michael Simkin
 +
|date  = June 26, 2015
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}}</ref>
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<ref name="post35130">{{LinkForumThread
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|format = ref
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|title  = Re: Freeze-Dried Slow Salvos
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|p      = 35130
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|author = Michael Simkin
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|date  = September 2, 2016
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}}</ref>
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</references>
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==External links==
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{{LinkLexicon|lex_s.htm#salvo}}
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{{LinkLexicon|lex_m.htm#monoparitysalvo|patternname=Monoparity salvo}}
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{{LinkLexicon|lex_m.htm#monochromaticsalvo|patternname=Monochromatic salvo}}

Latest revision as of 13:21, 8 January 2021

A salvo is a collection of spaceships (usually gliders) that are all coming from the same direction.[1] A salvo is generally aimed at a target to produce a specific reaction -- for example, in a sliding block memory or a slide gun, a salvo might move a block or other still life a step closer to the salvo source, or a step farther away. Or two or more salvos may collide with each other to synthesize a complex object.

Classification

Synchronized/Asynchronous

A synchronized salvo is a salvo in which the target reaction requires all spaceships to be in specific locations and timings relative to each other. A different, and probably less useful, construction reaction will occur if any single spaceship arrives at the construction site even a few ticks too soon or too late.

By contrast, a slow salvo is a salvo in which the individual spaceships are far enough apart that precise timing becomes irrelevant (i.e. they are asynchronous). Any collision reaction affecting the nth spaceship has settled down into a stable or periodic intermediate target, by the time the (n+1)st spaceship arrives.

P1/P2

A P1 slow salvo is a slow salvo in which the intermediate settled-down stages are all period 1 (i.e., stable.) It is conjectured that any glider-constructible object can be produced by a P1 slow salvo aimed at a single block or other small still life -- though the number of gliders needed may be very large.

Conversely, a P2 slow salvo may have intermediate stages containing P2 oscillators, allowing constructions with significantly fewer gliders on average. P3 and higher slow salvos are technically possible, but higher periods do not appear to make much difference to construction efficiency in Life, where higher-period oscillators are relatively rare in random ash.

  • If a P1 slow salvo is divided into two parts, the later group of gliders can always be delayed by any number of ticks relative to the earlier group, without changing the eventual construction reaction. In the P2 case, it is generally only safe to delay such a group by an even number of ticks -- though there will be exceptions for any specific gliders that are aimed at P1 intermediate targets.

Monochromatic/monoparity

A monochromatic salvo is a slow salvo that uses gliders of only one color.[2] For example, the slow salvos generated by half-baked knightships are monochromatic, because they are generated by a single type of reaction which can happen at any position along a diagonal line. The smallest possible step size is one full diagonal (1fd), which is two half diagonals (2hd), which means that any single glider-producing reaction can only reach half of the available glider lanes.

Similarly, a monoparity slow salvo is a slow salvo which contains only gliders of the same shape -- i.e., even or odd parity. The intermediate targets for this type of slow salvo can be P1 or P2, but P2 targets have two completely separate and non-interchangeable phases. A phase-0 blinker is a different target than a phase-1 blinker, for example, and the two targets would require completely different construction recipes. Even-step variants of the caterloopillar use slow salvos that are both monochromatic and monoparity.[3]

Freeze-dried

A freeze-dried salvo (or sometimes frozen salvo) is a dormant constellation of objects, which, being triggered by a glider or activated by other means, produces a slow salvo with required parameters. In other words, a freeze-dried salvo is essentially a slow salvo seed.[4]

See also

References

  1. Dave Greene (February 24, 2006). "New results from Glue 2". Conway's Life: Work in Progress. Retrieved on June 13, 2009.
  2. Dave Greene (April 18, 2014). Re: Serizawa - Linear Self Replicator (discussion thread) at the ConwayLife.com forums
  3. Michael Simkin (June 26, 2015). Re: David Bell's engineless caterpillar idea revisited (discussion thread) at the ConwayLife.com forums
  4. Michael Simkin (September 2, 2016). Re: Freeze-Dried Slow Salvos (discussion thread) at the ConwayLife.com forums

External links