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
