Difference between revisions of "Eater 2"
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==Synthesis== | ==Synthesis== | ||
On January 29, {{year|2004}} [[Mark Niemiec]] found a {{gliders|9}} [[synthesis]] of a variation of eater 2 that consists of a hat, a block, and a [[table]]. On October 9th, 2014, David S. Miller found a natural eater 2<ref>{{cite web|url=http://www.conwaylife.com/forums/viewtopic.php?f=7&t=1443&start=50#p13749|title=apgsearch: a high-performance soup searcher|date=|accessdate=November 9, 2014}}</ref> in a soup from [[Adam P. Goucher]]'s apgsearch script, from which Tanner Jacobi derived a 6-glider synthesis.<ref | On January 29, {{year|2004}} [[Mark Niemiec]] found a {{gliders|9}} [[synthesis]] of a variation of eater 2 that consists of a hat, a block, and a [[table]]. On October 9th, 2014, David S. Miller found a natural eater 2<ref>{{cite web|url=http://www.conwaylife.com/forums/viewtopic.php?f=7&t=1443&start=50#p13749|title=apgsearch: a high-performance soup searcher|date=|accessdate=November 9, 2014}}</ref> in a soup from [[Adam P. Goucher]]'s apgsearch script, from which Tanner Jacobi derived a 6-glider synthesis.<ref name="post14192" /> | ||
==Image gallery== | ==Image gallery== | ||
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==See also== | ==See also== | ||
*[[Eater 3]] | *[[Eater 3]] | ||
*[[Eater 4]] | *[[Eater 4]] | ||
*[[Eater 5]] | *[[Eater 5]] | ||
*[[Period-44 MWSS gun]] | *[[Period-44 MWSS gun]] where an eater 2 variant facilitates the evolution of MWSSes. | ||
*[[Buckingham's p13]] | |||
==References== | ==References== | ||
<references /> | <references> | ||
<ref name="post14192">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Soup search results | |||
|p = 14192 | |||
|author = Tanner Jacobi | |||
|date = November 8, 2014 | |||
}}</ref> | |||
</references> | |||
==External links== | ==External links== | ||
Revision as of 17:33, 31 January 2020
| Eater 2 | |||||||||
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| Pattern type | Strict still life Eater | ||||||||
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| Number of cells | 19 | ||||||||
| Bounding box | 7 × 7 | ||||||||
| Frequency class | 36.0 | ||||||||
| Discovered by | David Buckingham | ||||||||
| Year of discovery | Unknown | ||||||||
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Eater 2 (or block on hat siamese hat) is an eater that was found by David Buckingham in the 1970s. Mostly it works like the standard eater (see eater 1) but with two slight differences that make it useful despite its size; it takes longer to recover from each bite and it acts like an eater in two directions. The first property means that, among other things, it can eat a glider in a position that would destroy an eater 1. This novel glider-eating action is occasionally of use in itself, and combined with the symmetry means that an eater 2 can eat gliders along four different paths.
An eater 2 variant noticed by Stephen Silver in May 1998 that is useful for obtaining smaller bounding boxes is shown below. Note that the canonical version of eater 2 is a strict still life because the outside 15-cell component is not stable without the block (it is, rather, an inductee), but the eater 2 variant below is a pseudo still life because it is made up of an aircraft carrier, block and hat, each of which are stable.
Eater 2 can also be used to eat objects other than gliders. For example, one of them can eat a lightweight or middleweight spaceship, two of them can eat a 60P5H2V0, two or three of them can eat the bulk of a 2-engine or 3-engine Cordership respectively, and seven of them can be arranged to eat the majority of the 7-in-a-row Cordership.
The eater 2 is made up of 2 siamese hats supported by a block. Variants involving siamese loops and eleven loops also function.
It serves as the logo of Catagolue.
Synthesis
On January 29, 2004 Mark Niemiec found a 9-glider synthesis of a variation of eater 2 that consists of a hat, a block, and a table. On October 9th, 2014, David S. Miller found a natural eater 2[1] in a soup from Adam P. Goucher's apgsearch script, from which Tanner Jacobi derived a 6-glider synthesis.[2]
Image gallery
 Eater 2 variant |
See also
- Eater 3
- Eater 4
- Eater 5
- Period-44 MWSS gun where an eater 2 variant facilitates the evolution of MWSSes.
- Buckingham's p13
References
- ↑ "apgsearch: a high-performance soup searcher". Retrieved on November 9, 2014.
- ↑ Tanner Jacobi (November 8, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
External links
- Eater 2 at the Life Lexicon
- Nineteen-Bit Life Objects at Mark D. Niemiec's Life Page
- Patterns
- Patterns with Catagolue frequency class 36
- Natural periodic objects
- Periodic objects with minimum population 19
- Patterns with 19 cells
- Patterns found by David Buckingham
- Patterns that can be constructed with 6 gliders
- Still lifes
- Strict still lifes
- Strict still lifes with 19 cells
- Eaters
- Patterns with bilateral diagonal symmetry