Glider-producing switch engine: Difference between revisions

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The '''glider-producing switch engine''' (or '''glider-making switch engine''') is a [[puffer]] that was found by [[Charles Corderman]] in the early 1970s. It consists of a [[switch engine]] reacting with [[block]]s to produce various [[still life]]s, several [[blinker]]s, and a [[glider]] every 384 [[generation]]s.
The '''glider-producing switch engine''' (or '''glider-making switch engine''') is a [[puffer]] that was found by [[Charles Corderman]] in the early 1970s. It consists of a [[switch engine]] reacting with [[block]]s to produce various [[still life]]s, several [[blinker]]s, and a [[glider]] every 384 [[generation]]s.


Because of its easy construction (see its predecessors below), it has appeared in some superlinear growth patterns including [[mosquito 3]].<ref>{{CiteLexicon|file=lex_m.htm#mosquito3|name=Mosquito 3|accessdate=June 1, 2009}}</ref>
Because of its easy construction (see its predecessors below), it has appeared in some superlinear growth patterns including [[mosquito 3]].


==Commonness==
==Commonness==
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==Time bomb==
==Time bomb==
The '''time bomb''' (shown below) is a 17-[[cell]] [[pattern]] that was found by [[Doug Petrie]] that evolves into a glider-producing switch engine.<ref>{{CiteLexicon|file=lex_t.htm#timebomb|name=Time bomb|accessdate=May 16, 2009}}</ref>
The '''time bomb''' is a 17-[[cell]] [[pattern]] found by Douglas G. Petrie that evolves into a glider-producing switch engine.<ref>{{CiteLifeline|vol=10|pages=page 3}}</ref><ref>{{CiteLexicon|file=lex_t.htm#timebomb|name=Time bomb|accessdate=May 16, 2009}}</ref>


==Synthesis==
==Synthesis==
Although clean synthesis of the glider-producing switch engine requires 4 gliders, [[Michael Simkin]] found a 3-glider collision in October {{year|2014}} which includes the puffer in its [[ash]].<ref name="post13988" /> This collision has the minimum number of gliders necessary to exhibit infinite growth, and is the only known 3-glider collision to do so.
Although a clean synthesis of the glider-producing switch engine requires 4 gliders, [[Michael Simkin]] found a 3-glider collision in October {{year|2014}} which includes the puffer in its [[ash]].<ref name="post13988" /> This collision has the minimum number of gliders necessary to exhibit infinite growth, and is the only known 3-glider collision to do so.


==Image gallery==
==Image gallery==
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|-
|-
|[[Image:Gliderproducingswitchengine_debris.png|thumb|231px|left|The debris left behind by the glider-producing switch engine]]
|[[Image:Gliderproducingswitchengine_debris.png|thumb|231px|left|The debris left behind by the glider-producing switch engine]]
|[[Image:Timebomb.png|framed|left|The time bomb is a predecessor of the glider-producing switch engine<br />{{JavaRLE|timebomb|brief}}]]
|[[Image:Timebomb.png|framed|left|The time bomb<br />{{JavaRLE|timebomb|brief}}]]
|[[Image:Gliderproducingswitchengine_pred.png|framed|left|Another simple [[predecessor]] of the glider-producing switch engine<br />{{JavaRLE|gliderproducingswitchenginepredecessor}}]]
|[[Image:Gliderproducingswitchengine_pred.png|framed|left|Another simple [[predecessor]] of the glider-producing switch engine<br />{{JavaRLE|gliderproducingswitchenginepredecessor}}]]
|}
|}

Revision as of 07:14, 7 November 2020

Glider-producing switch engine
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View animated image
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Pattern type Puffer
Number of cells 123
Bounding box 67 × 60
Frequency class 21.0
Direction Diagonal
Period 384
Speed c/12
Discovered by Charles Corderman
Year of discovery 1971

The glider-producing switch engine (or glider-making switch engine) is a puffer that was found by Charles Corderman in the early 1970s. It consists of a switch engine reacting with blocks to produce various still lifes, several blinkers, and a glider every 384 generations.

Because of its easy construction (see its predecessors below), it has appeared in some superlinear growth patterns including mosquito 3.

Commonness

The glider-producing switch engine is the second most common naturally-occurring pattern that exhibits infinite growth, the most common being the block-laying switch engine. It is also the ninety-first most common object on Adam P. Goucher's Catagolue.[1]

Time bomb

The time bomb is a 17-cell pattern found by Douglas G. Petrie that evolves into a glider-producing switch engine.[2][3]

Synthesis

Although a clean synthesis of the glider-producing switch engine requires 4 gliders, Michael Simkin found a 3-glider collision in October 2014 which includes the puffer in its ash.[4] This collision has the minimum number of gliders necessary to exhibit infinite growth, and is the only known 3-glider collision to do so.

The debris left behind by the glider-producing switch engine
The time bomb
RLE: here
Another simple predecessor of the glider-producing switch engine
Download RLE: click here

References

  1. ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
  2. ↑ Robert Wainwright (June 1973). Lifeline, vol 10, page 3.
  3. ↑ "Time bomb". The Life Lexicon. Stephen Silver. Retrieved on May 16, 2009.
  4. ↑ Michael Simkin (October 24, 2014). Re: Making switch-engines (discussion thread) at the ConwayLife.com forums


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