Kickback: Difference between revisions
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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. | ||
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]] [[circuit]]ry or in self-supporting patterns like the [[Caterpillar]] or [[Centipede]], because it is generally less easy to arrange. | 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]] [[circuit]]ry or in self-supporting patterns like the [[Caterpillar]] or [[Centipede]], because it is generally less easy to arrange. However, as discovered by [[David Bell]], it can be used to create high-perod oscillators. | ||
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|caption = A p4284 oscillator based on the 180˚ kickback reaction. | |||
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==References== | ==References== | ||
Revision as of 00:39, 15 February 2024
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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. However, as discovered by David Bell, it can be used to create high-perod oscillators.
| A p4284 oscillator based on the 180˚ kickback reaction. (click above to open LifeViewer) |
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