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'''Monogram''' (or '''initials'''<ref>{{CiteLexicon|file=lex_i.htm#initials|name=Initials|accessdate=June 13, 2009}}</ref> or '''JHC'''<ref>{{CiteLexicon|file=lex_j.htm#jhc|name=JHC|accessdate=April 30, 2009}}</ref>) is a {{period|4}} [[oscillator]] that was found by [[Dean Hickerson]] on August 11, {{year|1989}}.<ref>{{CiteHickersonOscillators|accessdate=March 14, 2020}}</ref> It produces some weak sparks which can be utilized in e.g. the stabilization of the [[carnival shuttle]]. | '''Monogram''' (or '''initials'''<ref>{{CiteLexicon|file=lex_i.htm#initials|name=Initials|accessdate=June 13, 2009}}</ref> or '''JHC'''<ref>{{CiteLexicon|file=lex_j.htm#jhc|name=JHC|accessdate=April 30, 2009}}</ref>) is a {{period|4}} [[oscillator]] that was found by [[Dean Hickerson]] on August 11, {{year|1989}}.<ref>{{CiteHickersonOscillators|accessdate=March 14, 2020}}</ref> In terms of its minimum population of {{cells|18}} cells, it is tied with two variants of [[mold on table]] as the third smallest possible period-4 oscillator, although it is not known if this is a complete list.<ref name="post220431" /> It produces some weak sparks which can be utilized in e.g. the stabilization of the [[carnival shuttle]]. | ||
It first appeared [[semi-natural]]ly in September {{year|2014}} in a [[soup]] found by [[Josh Ball]] using [[apgsearch]].<ref name="post13516" /> It later appeared in an asymmetric soup on May 5, {{year|2015}}.<ref name="post19372" /> | It first appeared [[semi-natural]]ly in September {{year|2014}} in a [[soup]] found by [[Josh Ball]] using [[apgsearch]].<ref name="post13516" /> It later appeared in an asymmetric soup on May 5, {{year|2015}}.<ref name="post19372" /> | ||
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|author = Carson Cheng | |author = Carson Cheng | ||
|date = March 1, 2024 | |date = March 1, 2024 | ||
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<ref name="post220431">{{LinkForumThread | |||
|format = ref | |||
|title = Re: Oscillator Discussion Thread | |||
|p = 220431 | |||
|author = Matthias Merzenich | |||
|date = October 27, 2025 | |||
}}</ref> | }}</ref> | ||
</references> | </references> | ||
Revision as of 11:12, 27 October 2025
| Monogram | |||||||||
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| Pattern type | Oscillator | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Number of cells | 18 | ||||||||
| Bounding box | 7 × 7 | ||||||||
| Frequency class | 40.9 | ||||||||
| Period | 4 (mod: 2) | ||||||||
| Heat | 14 | ||||||||
| Volatility | 0.88 | 0.88 | ||||||||
| Kinetic symmetry | +c*c | ||||||||
| Discovered by | Dean Hickerson | ||||||||
| Year of discovery | 1989 | ||||||||
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Monogram (or initials[1] or JHC[2]) is a period-4 oscillator that was found by Dean Hickerson on August 11, 1989.[3] In terms of its minimum population of 18 cells, it is tied with two variants of mold on table as the third smallest possible period-4 oscillator, although it is not known if this is a complete list.[4] It produces some weak sparks which can be utilized in e.g. the stabilization of the carnival shuttle.
It first appeared semi-naturally in September 2014 in a soup found by Josh Ball using apgsearch.[5] It later appeared in an asymmetric soup on May 5, 2015.[6]
Ivan Fomichev found a 12-glider synthesis for a monogram based on an asymmetric soup on October 18, 2015.[7] This was reduced to 8 gliders by GUYTU6J using another soup on May 22, 2021,[8][9] and then to 7 gliders by MathAndCode on July 28, 2021.[10][11] On February 7, 2024, a 6-glider synthesis was found by Carson Cheng.[12][13]
References
- ↑ "Initials". The Life Lexicon. Stephen Silver. Retrieved on June 13, 2009.
- ↑ "JHC". The Life Lexicon. Stephen Silver. Retrieved on April 30, 2009.
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
- ↑ Matthias Merzenich (October 27, 2025). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Josh Ball (September 28, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ Lewis Patterson (May 5, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ Ivan Fomichev (October 18, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ GUYTU6J (May 22, 2021). Re: Thread for your unsure discoveries (discussion thread) at the ConwayLife.com forums
- ↑ shinjuku (#1288605620) (May 24, 2021). Job triggered by Adam P. Goucher at GitLab Catagolue project.
- ↑ MathAndCode (July 28, 2021). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ shinjuku (#1460905601) (July 29, 2021). Job triggered by Adam P. Goucher at GitLab Catagolue project.
- ↑ Carson Cheng (March 1, 2024). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ shinjuku (#6112988643) (February 7, 2024). Job triggered by Adam P. Goucher at GitLab Catagolue project.
External links
- Monogram at the Life Lexicon
- Monogram at Adam P. Goucher's Catagolue
- 18P4.1 at Heinrich Koenig's Game of Life Object Catalogs
- The 3 eighteen-bit period 4 oscillators at Mark D. Niemiec's Life Page (download pattern file: 18/18mg.rle)
Categories:
- Patterns
- Patterns with Catagolue frequency class 40
- Natural periodic objects
- Oscillators with 18 cells
- Periodic objects with minimum population 18
- Patterns with 18 cells
- Patterns found by Dean Hickerson
- Patterns found in 1989
- Patterns that can be constructed with 6 gliders
- Oscillators
- Oscillators with period 4
- Oscillators with mod 2
- Oscillators with heat 14
- Oscillators with volatility 0.88
- Oscillators with strict volatility 0.88
- Oscillators with +c*c symmetry
- Sparkers
- Sparkers with period 4
- Weak sparkers