User:Entity Valkyrie 2/EV2 Oscillator Categories
All oscillators are of some kind below. Some oscillators have additional classifications, like "muttering moat", but those oscillators are still necessarily part of some of the classifications below.
The rotor is encased within the stator. The definition of "encased" isn't always clear. Many times this classification is just given to oscillators that "look" "drifty".
When a part of the rotor can be encased within the stator, this is a "partial billiard table" (e.g. P7 pipsquirter).
A bare engine oscillator consists of a region that oscillates without the use of outside catalysts. If there are any stable cells, then either those cells aren't stable without the rotor, or they are not catalysts. (e.g. the table on table in the P4 HW emulator is not a catalyst since it is always connected to the rotor)
Hassler and Shuttle
A Hassler has an object that is perturbed by catalysts. A hassler generally returns the hassled object to its original location without generating the exact same pattern in a different location. A Shuttle generally has even period, and has an object moving back and forth or around in a loop. Usually the object reflects off stabilizations on the ends, however for it to be a shuttle, the active object must appear at least twice (or else it is a "quasi-shuttle", which is a classification of "hassler").
However, this classification doesn't always separate Hasslers from Shuttles. Sometimes a object that would classify as a "Shuttle" using these classifications might have the word "Hassler" or "Hassling" in it's name. Some conventions are:
- Even if a toad moves back and forth between each time a toad is sucked, it is still a toad hassler, not a "toad shuttle". The same thing happens with lots of other objects, like twin bees shuttles hassling blinker, not "twin bees shuttles 'shuttling' blinker" (even though the blinker does move back and forth).
- The blocker, as well as several P2, P4 and P6 oscillators, could be classified as "Shuttle" but are still "Hasslers" or even "Bare Engine". An example is the Confused eaters where you could say the nine is moving back and forth between the eaters, but it is usually described as two eaters hassling a nine, not two eaters "shuttling" a nine.
- Glider shuttles involving 90 degree reflectors can also be referred to as glider "loops", since it is the "loop" type of shuttle.
- Oscillators like Tumbler, which do move back and forth (just without any stabilizing objects), are generally considered "Bare Engine". The Tumbler is an RFO (reflectorless flipping oscillator). RFO is described as an object which flips itself around or turns 180 degrees every half cycle.
- An oscillator that turns itself 90 degrees after every quarter cycle is generally described as an RRO (reflectorless rotating oscillator), and not a "shuttle".
These oscillators consist of two smaller oscillators which react non-trivally to from a higher period oscillator. The two oscillators themselves stay the same period. Usually there will only be a few cells that oscillate at the full period.
LCM (lowest common multiple)
These oscillators are "trivial", and their rotors don't interact. The two oscillators are connected/welded in some way. An oscillator like Trivial p6-1 is considered "partial billiard table" because the two rotors still interact, just this interaction doesn't create any cells oscillating at the full period.