Kickback: Difference between revisions
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{{Glossary}} | {{Glossary}} | ||
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|caption = The '''180-degree kickback'''<ref>{{CiteLifeline|vol=1|pages=page 4}}</ref> | |viewerconfig = #C [[ THUMBNAIL THUMBSIZE 3 ZOOM 15 WIDTH 500 HEIGHT 400 GPS 20 THEME 6 GRID OFF AUTOSTART T 0 PAUSE 2 T 49 PAUSE 1 LOOP 50 ]] | ||
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|caption = The '''180-degree kickback'''<ref>{{CiteLifeline|vol=1|pages=page 4}}</ref> | |||
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|caption = The '''90-degree kickback'''<ref>{{CiteLifeline|vol=11|pages=page 10}}</ref> | |viewerconfig = #C [[ THUMBNAIL THUMBSIZE 3 ZOOM 15 WIDTH 500 HEIGHT 400 GPS 20 THEME 6 GRID OFF AUTOSTART T 0 PAUSE 2 T 49 PAUSE 1 LOOP 50 ]] | ||
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|caption = The '''90-degree kickback'''<ref>{{CiteLifeline|vol=11|pages=page 10}}</ref> | |||
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A '''kickback''' is any of the two [[2-glider collision]]s resulting in a single glider travelling in the opposite direction to one of the original gliders. In a '''90-degree kickback''', the two gliders collide at right angle, while in a '''180-degree kickback''' they are head-on. Both output gliders are one [[half-diagonal]] away from the [[lane]] of one of the inputs. | A '''kickback''' is any of the two [[2-glider collision]]s resulting in a single glider travelling in the opposite direction to one of the original gliders. In a '''90-degree kickback''', the two gliders collide at right angle, while in a '''180-degree kickback''' they are head-on. Both output gliders are one [[half-diagonal]] away from the [[lane]] of one of the inputs. | ||
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==External links== | ==External links== | ||
{{LinkLexicon|lex_k.htm#kickback}} | * {{LinkLexicon|lex_k.htm#kickback}} | ||
{{LinkLexicon|lex_k.htm#kickbackreaction|name=Kickback reaction}} | * {{LinkLexicon|lex_k.htm#kickbackreaction|name=Kickback reaction}} | ||
{{LinkLexicon|lex_1.htm#a-180degreekickback|name=180-degree kickback}} | * {{LinkLexicon|lex_1.htm#a-180degreekickback|name=180-degree kickback}} | ||
[[Category:Synthesis]] | |||
Revision as of 13:50, 26 November 2022
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A kickback is any of the two 2-glider collisions resulting in a single glider travelling in the opposite direction to one of the original gliders. In a 90-degree kickback, the two gliders collide at right angle, while in a 180-degree kickback they are head-on. Both output gliders are one half-diagonal away from the lane of one of the inputs.
The 90-degree kickback is important in the original proof of the existence of a universal constructor (using an elbow ladder) and in Bill Gosper's total aperiodic, as well as a number of other constructions and glider syntheses. Thus the term kickback reaction may also refer to the 90-degree one specifically. The 180-degree kickback is rarely used in signal circuitry or in self-supporting patterns like the Caterpillar or Centipede, because it is generally less easy to arrange.
References
- ↑ Robert Wainwright (March 1971). Lifeline, vol 1, page 4.
- ↑ Robert Wainwright (September 1973). Lifeline, vol 11, page 10.
External links
- Kickback at the Life Lexicon
- Kickback reaction at the Life Lexicon
- 180-degree kickback at the Life Lexicon