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Glossary
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#space (prefix "#"): Abstract concept synonymous with that of Set.
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Phenomenon: Concrete or virtual Observation.
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Phenomenon #space (PS): Set of Phenomena. It encompasses:
1.space, or 3D Euclidian #space,
2.1D time #space.

Model #space (MS): A particular subset of #space which endeavours to map, to 
order and to coordinate Phenomena of PS into consistent and coherent structures.

Event: Elementary Phenomenon which may be mapped to a point of MS. We will say 
that "event" of PS maps into "#event" of MS and that "phenomenon" of PS maps 
into "#phenomenon" or a structure of #events in MS

Theory, or Model: A particular MS.

NOTE 1: PS is unique per observer and Theory independent.

NOTE 2: Virtual Observations are "mental experiments" conceived in MS.
They are the rockbed of scientific creativity and verification and, more 
generally, of any planned and purposeful human activity.

NOTE 3: Observations, whether concrete or virtual may be direct, i.e. perceived 
via observer's senses, or indirect, noted as output of technical devices. 
Design of such experimental devices falls into the field of virtual 
observations and is one of fundamental activities of science.
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Naive View (NV): A fundamental, elementary MS constructed by the Subconscious
Mind from subjective perceptions. Phenomena are mapped into NV and subjectively
perceived as "real" objects and events. Their #space is perceived as "reality".
NV's "reality" is the direct mapping or appearance of external, transcendental 
reality to the conscious mind. 
Transcendental reality is accessible to cognition only via its "reality" map 
into the NV. As such, it stays outside of cognition and, consequently, outside 
of the scope of our Workshop.  In future texts we may drop the inverted commas
and talk about reality when no ambiguity will be possible and aways keeping in 
mind that we mean by it the "reality" of NV.

NV deals with the #space of PS encompassing as said above:
1.space, or 3D Euclidian #space,
2.time as 1D #space.

NV is a MS highly organized and ordered by the subconscious mind including its
particular reason, often called "Common Sense".
Highbrow, ivory tower scientists despise the "Common Sense" as the worst guide 
in science. And, indeed, it is a bad guide when applied out of NV to MS's where 
it is not pertinent.
The first precept of rationality is to apply particular pertinent reason for
particular context where it belongs. However, that's exactly what the well
understood Common Sense tells us, thus becoming the best, indeed the only guide
in science. Cutting us from the Common Sense results in acrobatic playing with
impressing equations without getting the gist of the play.
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Object and Body. In order to keep in line with current terms of Physics'
metalanguage, in #spaces encompassing space and time dimensions, we may call
some space structures "objects" or "bodies".
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Referential: A particular context of #events.  
Reference System: A particular system of coordinates associated with a
referential. 
We may use "system" for "reference system" where the context excludes any 
ambiguity.

NOTE 1: Referential is a concept indispensable for intuitive creativity and
understanding. It's enough to mention such concepts as a spinning disk or a box
falling free in the gravity field. It precedes its mathematical formalization
with help of some (reference) systems. After this formalization it often, if
not always, carries the gist of a Model, which should be understandable without
mathematical details.

NOTE 2: We shall not use (else than in quotations) the term "reference frame".
It's redundant and misleading in its suggestion of some "container" of 
different nature than its contents.  

NOTE 3: We hope to have introduced some order into the essential for Relativity,
but badly muddled terminology. In Einstein's writings we have noted "reference
system", "reference frame", "reference coordinates", "reference body",
"reference object" and the German "Bezugssystem" loaded with still different
connotations.
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Einstein's Covering Principle (ECP) (Gesetz der Lagerung starrer Koerper):
When a virtual observation involves distance measurement, it has to be carried
out with help of rigid bodies of known unit-, or reference length. We shall
say that a segment is 5m long if and only if it is exactly covered with five
rigid bodies of 1m each. Covering bodies and covered segment comply during the
measurement with all laws of the involved MS. For instance covering bodies may
be subject to Lorentz contraction and the covered segment has to be one of
a geodesic of the involved MS. Shortly: Rigid bodies complying with MS's laws
must exactly cover patterns complying with MS's geometry. In case of curved
#space, covering bodies must have the curvature corresponding to that of the
covered pattern.
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