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|Number of cells||305|
|Discovered by||Noam Elkies|
|Year of discovery||1995|
Pi orbital is a period-168 oscillator that was found by Noam Elkies on August 22, 1995. It consists of four 42-generation 90-degree pi heptomino turns, each using a crown and a block. A second pi heptomino can be inserted to reduce the period to 84, but no further reduction (such as 168/3=56) is allowed to work. Its name could be a reference to the pi orbital in chemistry.
On March 26, 2009 Nicolay Beluchenko found a relatively small period-12 sparker, 44P12.3, that could replace the crown. On April 6, 2010 Matthias Merzenich discovered the blocked p4-4 that also supports the oscillator. Currently, the exact pi-turning reaction has not been made into a stable conduit yet.
If the block in a turn is removed, another block will be dropped nearby. A block pull can restore it, as is shown in the final step of a glider synthesis of the p12-supported variant by GUYTU6J in December 2020. Meanwhile, the fact makes pi orbital a block factory suitable for stabilizing a honey farm-hassling wick at the same period. Furthermore, sparking the active region before settling into the block creates a B-heptomino, and welding a BFx59H to the blocked p4-4 to release a Herschel is possible.
- Jason Summers' jslife pattern collection. Retrieved on March 14, 2020.
- Heinrich Koenig (April 14, 2009). "New Oscillators". Game of Life News. Retrieved on September 15, 2021.
- Adam P. Goucher (January 3, 2011). "A plethora of p4 hasslers". Game of Life News. Retrieved on September 15, 2021.
- Dave Greene (April 10, 2017). Re: Stable signal converters (discussion thread) at the ConwayLife.com forums
- GUYTU6J (December 27, 2020). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- Matthias Merzenich (July 7, 2021). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- wwei23 (December 12, 2020). Re: Gun Discussion Thread (discussion thread) at the ConwayLife.com forums
- Adam P. Goucher (December 15, 2020). Re: Gun Discussion Thread (discussion thread) at the ConwayLife.com forums