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Line 11: Line 11:
|v                = 0.88
|v                = 0.88
|sv              = 0.88
|sv              = 0.88
|symmetry        = +c*c
|discoverer      = Dean Hickerson
|discoverer      = Dean Hickerson
|discoveryear    = 1989
|discoveryear    = 1989
|rulemin          = B3/S23
|rulemin          = B3/S23
|rulemax          = B3678/S023678
|rulemax          = B3678/S023678
|rulespecial      = [[Conway's Game of Life|Conway Life]]
|rulespecial      = [[Conway's Game of Life|Conway Life]], [[HighLife]]
|synthesis        = 11
|isorulemin      = B3einy/S2-n3e
|isorulemax      = B2ekn34-aeik5-nr678/S01c234-z5-e678
|synthesis        = 6
|synthesisRLE    = true
|synthesisRLE    = true
|life105          = true
|life106          = true
|plaintext        = true
|plaintext        = true
|rle              = true
|rle              = true
Line 25: Line 26:
|apgcode          = xp4_hv4a4vh
|apgcode          = xp4_hv4a4vh
|pentadecathlonid = 18P4.1
|pentadecathlonid = 18P4.1
|viewerconfig    = #C [[ GPS 2 ZOOM 24 LOOP 4 ]]
}}
}}
'''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]] [[:Category:Oscillators with period 4|4]] [[oscillator]] that was found by [[:Category:Patterns found by Dean Hickerson|Dean Hickerson]] in August [[:Category:Patterns found in 1989|1989]]. It produces some weak sparks which can utilized in eg. 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]].
[[Category:Sparkers]]
[[Category:Sparkers with period 11]]


[[Category:Weak sparkers]]
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" />


[[Ivan Fomichev]] found a {{gliders|12}} [[synthesis]] for a monogram based on an asymmetric soup on October 18, {{year|2015}}.<ref name="post23928" /> This was reduced to {{gliders|8|text=8 gliders}} by [[GUYTU6J]] using another soup on May 22, {{year|2021}},<ref name="post130643" /><ref name="j1288605620" /> and then to {{gliders|7|text=7 gliders}} by [[MathAndCode]] on July 28, 2021.<ref name="post134187" /><ref name="j1460905601" /> On February 7, {{year|2024}}, a {{gliders|6}} synthesis was found by [[Carson Cheng]].<ref name="post179381"/><ref name="j6112988643"/>


==References==
== References ==
<references />
<references>
<ref name="j1288605620">{{CiteCatagolueJob|job=1288605620|date=May 24, 2021}}</ref>
<ref name="j1460905601">{{CiteCatagolueJob|job=1460905601|date=July 29, 2021}}</ref>
<ref name="j6112988643">{{CiteCatagolueJob|job=6112988643|date=February 7, 2024}}</ref>
<ref name="post13516">{{LinkForumThread
|format = ref
|title  = Re: Soup search results
|p      = 13516
|author = Josh Ball
|date  = September 28, 2014
}}</ref>
<ref name="post19372">{{LinkForumThread
|format = ref
|title  = Re: Soup search results
|p      = 19372
|author = Lewis Patterson
|date  = May 5, 2015
}}</ref>
<ref name="post23928">{{LinkForumThread
|format = ref
|title  = Re: Soup search results
|p      = 23928
|author = Ivan Fomichev
|date  = October 18, 2015
}}</ref>
<ref name="post130643">{{LinkForumThread
|format = ref
|title  = Re: Thread for your unsure discoveries
|p      = 130643
|author = GUYTU6J
|date  = May 22, 2021
}}</ref>
<ref name="post134187">{{LinkForumThread
|format = ref
|title  = Re: Synthesising Oscillators
|p      = 134187
|author = MathAndCode
|date  = July 28, 2021
}}</ref>
<ref name="post179381">{{LinkForumThread
|format = ref
|title  = Re: Synthesising Oscillators
|p      = 179381
|author = Carson Cheng
|date  = March 1, 2024
}}</ref>
<ref name="post220431">{{LinkForumThread
|format = ref
|title  = Re: Oscillator Discussion Thread
|p      = 220431
|author = Matthias Merzenich
|date  = October 27, 2025
}}</ref>
</references>


==External links==
== External links ==
{{LinkWeisstein|filename=Monogram.html}}
* {{LinkLexicon|lex_m.htm#monogram}}
{{LinkLexicon|lex_m.htm#monogram}}
* {{LinkCatagolue|xp4_hv4a4vh}}
{{LinkCatagolue|xp4_hv4a4vh}}
* {{LinkPentadecathlonObject|18P4.1}}
{{LinkPentadecathlonObject|18P4.1}}
* {{LinkNiemiec|p4.htm#p4-18|The 3 eighteen-bit period 4 oscillators|rle=18/18mg.rle}}


{{Symmetry|orthogonal4|osc=flip}}
{{Sparker|p=4|strength=weak}}

Latest revision as of 14:27, 15 January 2026

Monogram
x = 7, y = 5, rule = B3/S23 2o3b2o$bobobo$b2ob2o$bobobo$2o3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 2 ZOOM 24 LOOP 4 ]]
View animated image
View static image
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

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

  1. ↑ "Initials". The Life Lexicon. Stephen Silver. Retrieved on June 13, 2009.
  2. ↑ "JHC". The Life Lexicon. Stephen Silver. Retrieved on April 30, 2009.
  3. ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  4. ↑ Matthias Merzenich (October 27, 2025). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  5. ↑ Josh Ball (September 28, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  6. ↑ Lewis Patterson (May 5, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  7. ↑ Ivan Fomichev (October 18, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  8. ↑ GUYTU6J (May 22, 2021). Re: Thread for your unsure discoveries (discussion thread) at the ConwayLife.com forums
  9. ↑ shinjuku (#1288605620) (May 24, 2021). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  10. ↑ MathAndCode (July 28, 2021). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  11. ↑ shinjuku (#1460905601) (July 29, 2021). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  12. ↑ Carson Cheng (March 1, 2024). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  13. ↑ shinjuku (#6112988643) (February 7, 2024). Job triggered by Adam P. Goucher at GitLab Catagolue project.
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