Cord puller: Difference between revisions
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show the pattern outside the infobox, https://conwaylife.com/forums/viewtopic.php?p=160546#p160546 |
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'''Cord puller''' is a diagonal [[sawtooth]] that was discovered by [[Dean Hickerson]] on May 14, {{year|1991}}. It has expansion factor 6. | '''Cord puller''' is a diagonal [[sawtooth]] that was discovered by [[Dean Hickerson]] on May 14, {{year|1991}}. It has expansion factor 6. | ||
It works by firing pairs of [[glider]]s at the back of a [[7-engine Cordership]] so that when the first pair hits the Cordership, a [[block]] is created in the path of the following glider pairs. When those pairs hit the block, it is pulled back closer to the [[gun]] at the southeast. When the block reaches the gun, it is destroyed, allowing the gliders to reach the Cordership again and start the process over again. | The pattern can be seen [[#Cord puller|below]]. It works by firing pairs of [[glider]]s at the back of a [[7-engine Cordership]] so that when the first pair hits the Cordership, a [[block]] is created in the path of the following glider pairs. When those pairs hit the block, it is pulled back closer to the [[gun]] at the southeast. When the block reaches the gun, it is destroyed, allowing the gliders to reach the Cordership again and start the process over again. | ||
Its population in generation t = 8(6 | Its population in generation {{nowrap|t {{=}} 8 (6{{sup|n}}) − 216 (n ≥ 2)}} is {{nowrap|t/36 + 558}}, but the population in generation {{nowrap|32 (6{{sup|n}}) − 429 (n ≥ 2)}} is only 469.<ref>[[Alan Hensel]]'s [http://www.ibiblio.org/lifepatterns/ {{filename|lifep.zip}} pattern collection], {{filename|CORDPULL.LIF}}.</ref> | ||
==Image gallery== | ==Image gallery== | ||
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|[[Image:Cordpuller_pop.png|thumb|left|The number of alive cells plotted versus the number of elapsed [[generation]]s roughly forms an ever-increasing sawtooth graph.]] | |[[Image:Cordpuller_pop.png|thumb|left|The number of alive cells plotted versus the number of elapsed [[generation]]s roughly forms an ever-increasing sawtooth graph.]] | ||
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== Cord puller == | |||
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==References== | ==References== | ||
<references /> | <references /> | ||
[[Category:Patterns involving switch engines]] | [[Category:Patterns involving switch engines]] | ||
Revision as of 15:55, 17 April 2023
| Cord puller | |||||||||
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| Pattern type | Sawtooth | ||||||||
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| Number of cells | 434 | ||||||||
| Bounding box | 98 × 93 | ||||||||
| Expansion factor | 6 | ||||||||
| Discovered by | Dean Hickerson | ||||||||
| Year of discovery | 1991 | ||||||||
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Cord puller is a diagonal sawtooth that was discovered by Dean Hickerson on May 14, 1991. It has expansion factor 6.
The pattern can be seen below. It works by firing pairs of gliders at the back of a 7-engine Cordership so that when the first pair hits the Cordership, a block is created in the path of the following glider pairs. When those pairs hit the block, it is pulled back closer to the gun at the southeast. When the block reaches the gun, it is destroyed, allowing the gliders to reach the Cordership again and start the process over again.
Its population in generation t = 8 (6n) − 216 (n ≥ 2) is t/36 + 558, but the population in generation 32 (6n) − 429 (n ≥ 2) is only 469.[1]
Image gallery
 |
Cord puller
| (click above to open LifeViewer) RLE: here Plaintext: here |
References
- ↑ Alan Hensel's lifep.zip pattern collection, CORDPULL.LIF.