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The particles are represented by lines that may be of various kinds depending on the type of particle they are associated. A point where the lines intersect is called the interaction point, or just the top. The lines are divided into three categories: internal lines (which connect two vertices), incoming lines (which come from the past and come into a vertex and representing the originally non-interacting) and outgoing lines (which start at a vertex and extend "the future" and the final states are not interacting). Sometimes the tables are turned and the past is down, and the future high.

In these diagrams, for example an electron in an electromagnetic field (continuous double line) may have the following behaviors: (a) emits and absorbs a virtual photon (wavy line) ;(b) emits and absorbs a virtual electron-positron pair (double circle ); (c) emits a photon and immediately after another, with an overlap in time; (d) where the virtual electron-positron pair is emitted electron emits a virtual photon is absorbed.
Including into the Standard Model also the non-elementary particles as molecules, atoms, hadrons and mesons, a complete list of all the elements concerning the physical level of the Universe so far discovered or hypothesized is available.
This is what happens when we forget that the mind is meant to be a servant, and start to allow it to run our lives. The head is filled with mechanisms, the mouth is ranting and raving, and the whole surrounding atmosphere is being polluted by this factory of arguments and opinions. 


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| Hierarchy of Some Systems and Domains of Knowledge Graphics created by Marshall Clemens, NECSI |