Cord puller: Difference between revisions
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[[ | {{Pattern|type=Sawtooth|name=Cord puller|discoverer=Dean Hickerson|discoveryear=1991|pname=cordpuller|c=434|bx=98|by=93|life105=true|life106=true|plaintext=true|rle=true}} | ||
'''Cord puller''' is a diagonal [[sawtooth]] that was discovered by [[Dean Hickerson]] on May 14, [[:Category:Patterns found in 1991|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. | |||
It population in generation t = 8(6<sup>n</sup>) - 216 (n ≥ 2) is t/36 + 558, but the population in generation 32(6<sup>n</sup>) - 429 (n ≥ 2) is only 469.<ref>[[Alan Hensel]]'s [http://www.ibiblio.org/lifepatterns/ lifep.zip pattern collection].</ref> | |||
==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.]] | |||
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==References== | |||
<references /> | |||
Revision as of 17:53, 5 September 2009
| Cord puller | |||||||
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| Pattern type | Sawtooth | ||||||
|---|---|---|---|---|---|---|---|
| Number of cells | 434 | ||||||
| Bounding box | 98 × 93 | ||||||
| Static symmetry | Unspecified | ||||||
| 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.
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.
It 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
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