Karel's p15 is a period-15 oscillator discovered by Karel Suhajda on December 11, 2002.[1] It consists of a period 15 rotor supported by the domino spark of a pentadecathlon. A pentadecathlon can support 2 Karel's p15s. It provides accessible sparks that can be used to perturb reactions; the advantage of Karel's p15 over a pentadecathlon is that the pentadecathlon's long end reaches its maximum extent on two separate occasions, while Karel's p15 does only once. The p15 bouncer mechanism is an example. In the same month of its discovery, Mark Niemiec found an 18-glider synthesis of this oscillator.[2]
This oscillator first appeared semi-naturally in March 2015.[3]
A glider stream with period divisible by 5 but not 15 can be filtered with a Karel's p15 to triple the period, as shown in the gallery below.
Gallery
 Period 435 gun shows how this pattern thins out the glider stream and triples the period. |
See also
References
External links
- 28P15.3 at Heinrich Koenig's Game of Life Object Catalogs
