Part

The concept part, which is here decisive, is understood as a primitive concept. This does not prevent theoreticians from providing the following three formal properties of the concept: irreflexivity (nothing is a proper part of itself), asymmetry (if something is a proper part of something else, then the latter is not a proper part of the former), and transitivity (if something is a proper part of something else, and this latter is a proper part of a third thing, then the first is also a proper part of the third). [Lorenz B. Puntel]
== R ==
Theoretical framework; Structure