Difference between revisions of "P44 pi-heptomino hassler"
DroneBetter (talk | contribs) m (change a 5 to a 2 and a k to an 8 (in the apgcode for the one Carson Cheng changed to the actual minimal form)) |
DroneBetter (talk | contribs) m (Add current smallest p44 glider gun (also based on it), remove mention that the minimal form of Mitchell Riley's hassler has not occurred in the mvr_catforce_stdin (it seems that it has now)) |
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|caption = Buckingham's original period 44 gun and its subsequent improvement, as well as the small [[period-44 MWSS gun]] found by [[Dietrich Leithner]] | |caption = Buckingham's original period 44 gun and its subsequent improvement, as well as the small [[period-44 MWSS gun]] found by [[Dietrich Leithner]] | ||
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|rle = x = 39, y = 29, rule = B/S012345678 | |||
20bo8b3o$19bobo9bo$9b2o3b2o4bo9bo$9bo4bo$11bo3bo$10b2o2b2o$8bo2bobo18b2obo$8b2o3bo18bob2o$12bo23b2o$12b2o19b2o3bo$33bob3o$6b3o$34b2o$3b2o12b2o4b2o9b2o$2bobo11bobo4bobo$2bo13bo8bo$b2obo11bobo4bobo$o2b2o12b2o4b2o$2o27bo$6b3o21bo$29bo$12b2o$12bo20b2o$8b2o3bo15b2o2b2o2b2o$8bo2bobo15b2o2bo2bobo$10b2o2b2o5b2o12b3o$11bo3bo6bo12b2o$9bo4bo4b3o$9b2o3b2o3bo! | |||
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|caption = The smallest known period-44 glider gun (by bounding box) as of June 24, 2023. | |||
|apgcode = xp0_g8sc0gwggy2ca23xdbg0s93gz11w33wh9yb56w1hggzy51xs2my0m2sy7m2s53zg88bjoy411y011xggx444011z0116246yco861s826zy3ca8y34a4x23x23 | |||
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==Other p44 pi-heptomino hassler== | ==Other p44 pi-heptomino hassler== | ||
In [[Mitchell Riley]]'s mvr_catforce_stdin census on Catagolue, there have occurred many variants of an unrelated such hassler, | In [[Mitchell Riley]]'s mvr_catforce_stdin census on Catagolue, there have occurred many variants of an unrelated such hassler, the minimal form of which is shown below. | ||
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Revision as of 19:49, 24 June 2023
| p44 pi-heptomino hassler | |||||||||||
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| Pattern type | Oscillator | ||||||||||
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| Number of cells | 72 | ||||||||||
| Bounding box | 31 × 42 | ||||||||||
| Period | 44 (mod: 44) | ||||||||||
| Heat | 66 | ||||||||||
| Volatility | 0.94 | 0.94 | ||||||||||
| Kinetic symmetry | Unspecified | ||||||||||
| Discovered by | David Buckingham | ||||||||||
| Year of discovery | 1992 | ||||||||||
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- For other period-44 pi-heptomino hasslers, see Period-44 pi-heptomino hasslers.
p44 pi-heptomino hassler is a period-44 oscillator discovered by David Buckingham on April 2, 1992.[1] It was improved to another form by Noam Elkies in April 1996 and to the current form by iNoMed[2] based on a reaction by cvojan on May 10, 2022.[3] The oscillator consists of two pi-heptominos being hassled by two of a transparent catalyst (originally two heavyweight emulators) and four blocks. On July 25, 2022, Mitchell Riley found a stabilization using only still lifes, specifically four eater 2s and two blocks.[4]
Buckingham used two copies of this oscillator to make the first period-44 glider gun. This became obsolete in October 1996 when Buckingham found a gun that only used one copy of the oscillator.
In 1994 Dean Hickerson found a way to double the oscillator's period by adding two molds, creating the first gliderless period 88 oscillator. David Buckingham also found a way to triple the period before August 1994. Doubling the period with molds also works with the related p50 pi-heptomino hassler, but tripling in the same way 44 becomes 132 does not. In 2022, on the same day as the eater 2 stabilization above, dani found a non-trivial period-sextupled version of the oscillator, which also works with other versions of the catalyst.[5]
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Other p44 pi-heptomino hassler
In Mitchell Riley's mvr_catforce_stdin census on Catagolue, there have occurred many variants of an unrelated such hassler, the minimal form of which is shown below.
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See also
References
- ↑ Dean Hickerson's oscillator stamp collection.
- ↑ iNoMed (May 10, 2022). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ cvojan (May 10, 2022). Re: Catalyst Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Mitchell Riley (July 25, 2022). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ dani (July 25, 2022). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
External links
- Patterns
- Oscillators with 72 cells
- Periodic objects with minimum population 72
- Patterns with 72 cells
- Patterns found by David Buckingham
- Patterns found in 1992
- Patterns that can be constructed with 28 gliders
- Outer-totalistically endemic patterns
- Oscillators
- Oscillators with period 44
- Oscillators with mod 44
- Oscillators with heat 66
- Oscillators with volatility 0.94
- Oscillators with strict volatility 0.94
- Patterns with rectangular orthogonal symmetry
- Pi-heptomino hasslers