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Restore the old p160 glider gun removed in oldid=132645 to match description in text above |
DroneBetter (talk | contribs) m Add queen bee shuttle and citation for which (also, thank you, GUYTU6J, your edit was a good idea :-) |
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* Multiple of 5 but not 10, ×2: [[p10 filter]] | * Multiple of 5 but not 10, ×2: [[p10 filter]] | ||
* Multiple of 5 but not 15, ×3: [[Karel's p15]] | * Multiple of 5 but not 15, ×3: [[Karel's p15]] | ||
* Multiple of 15 but not 30, ×2: [[Queen bee shuttle]]<ref>As used in the [[RLE:Period90glidergun|smallest period-90 glider gun]] (note that it is shown in the [[p45 pi-heptomino hassler]] page, which also functions as a period-tripler, but is not a filter because it depends on a temporary block to destroy the second of every pair of gliders between those let through, which (if not destroyed) can otherwise destroy the hassler itself)</ref> | |||
==See also== | ==See also== | ||
Revision as of 21:30, 21 June 2023
A filter is an oscillator used to delete some but not all of the spaceships in a stream. For example, a blocker can delete every second glider in a stream of period 8n + 4, and can also do the same for LWSS streams. Other examples are the middleweight emulator, T-nosed p4 (either of which can be used to delete every second LWSS in a stream of period 4n + 2) and the fountain (which does the same for MWSS streams).
Filters can be used to make guns of high periods. For instance, the period-20 glider gun can be made p40 with a blocker, then p80 with Rich's p16, and even p160 with 68P32.1:
| p160 glider gun (click above to open LifeViewer) RLE: here Plaintext: here |
A smaller, more recent period-160 glider gun uses Charity's p16 as the first filter instead:
| p160 glider gun (click above to open LifeViewer) Catagolue: here |
List of filters
- Multiple of 4 but not 8, ×2: Blocker
- Multiple of 8 but not 16, ×2: Rich's p16, Charity's p16
- Multiple of 16 but not 32, ×2: 68P32
- Multiple of 32 but not 64, ×2: 51P384[1]
- Multiple of 5 but not 10, ×2: p10 filter
- Multiple of 5 but not 15, ×3: Karel's p15
- Multiple of 15 but not 30, ×2: Queen bee shuttle[2]
See also
References
- ↑ AlbertArmStain (April 3, 2023). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ As used in the smallest period-90 glider gun (note that it is shown in the p45 pi-heptomino hassler page, which also functions as a period-tripler, but is not a filter because it depends on a temporary block to destroy the second of every pair of gliders between those let through, which (if not destroyed) can otherwise destroy the hassler itself)
External links
- Filter at the Life Lexicon