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Representations

(to be edited)

1. Generalities

Representations are a kind of beings.

Representation per-se (per construction) or per accident (trace)

In the traditional world, an enormous ditch parted representations from the represented beings. From mass and energy standpoints, there was no common scale between a text or a painting and the person or the country described. The difference was also borne from the difficulty, and often the impossibility, to duplicate the thing, when a copy of the representation was comparatively easy. (That is of course less true for sculpture or performance arts). "The map is not the territory" was a fundamental motto of any epistemology.

We must, specially here, "desanthromorphize" ! We do not deal here with representations for human beings (see in special chapter), but for systems in general (finite automata, computers (not seen for their physical aspects)...
A major point: text; the normal way human beings use is through writing or sound. In both cases, these documents include a lot of "decorative" aspects that in principle are not meaningful, not real part of the text
but how far, inside a natural language or not, can we reduce the things to a (standardized?) minimal expression
Residue?

In digital universes, as long as connection with physical word is not needed by human beings, this gap vanishes. Representations of beings may have a role or mass reducing for easer use, but remain in the low physicality of electronic devices.

In parallel, human beings have learned to enjoy representations, up to the point of live purely electronic ("virtual") worlds, where representations stand for themselves, and the maps no longer need a territory to be valuable, though calling for appropriate scale changes for human efficiency or pleasure.

External representations are made by a being to be transmitted to others. In this line, a representation is a kind of message from an emitter to a receiver (possibly multiple).

Internal representations are beings referring to other ones, and making it possible to use these ones in a more economic way. In the classical discourse about computers and information systems, the reality is outside and representations value depends on this world. In DU, a major part of representations stand for themselves and are used for themselves. Art was a precursor of "second worlds".

A virtual being is not (not necessarily)a representation. It is a being without a location in the material digital universe. Even if it mimics real beings. It has a form reality through
- its presentation to and interaction with real users, or better, a community of real users
- its persistence in time
- (in physical world) its presence on a real URL.

Representations as such are passive and dependent beings. They are "read", or "looked at" when that is better that to a direct access to the represented being, or when the represented being is not accessible. For instance, historical beings no longer existing, or distant beings whose access in long and costly, etc. They must not exert an autonomous activity, but for the case of “simulation”.

Representations are created in two cases :
- when S needs them for its own use ; if it is for future use, the representations are stored in memory, they become part of S knowledge, or "culture" ; in the normal cases, theses representations are compact and structured, in order to reduce storage costs and to facilitate use ;
- when S has to present things to other beings ; in this case, these representations can be short or, in the contrary, developed to cope for transmission errors or to conform the receiver needs or desires.

There are basically two ways :
- from intrinsic nature
- from some sort of scanning or artificial compressing.

If the represented beings are changing in time, their representations must conform to these changes. There are several way to obtain this result :
- regular access to the being in order to obtain the new information
- knowledge of the laws of change according to time, and computation of the new values when using the representation
- integration of a specific clock in the representation, which will change in a way conform to the original.

In the last two cases, arise the possibility of errors, if the law of change is erroneous, or not sufficiently precise, or it unpredicted events affect the status of the represented being.

Metrics of representations: e.g. number of bits in the representation/number of bits in the represented

The simplest modes of reconstitution are :
- a pointer on (the address of) the being itself
- a bit per bit copy of the being.

These two modes are impossible or of limited use :
- by address : the being is far located, or does not exist any more, or not yet (it is a being to be made now or later)
- by copy : the being is heavy, possibly heavier than the totality of S itself. Moreover, for some actions/processes, the important lies in certain features of B, which would have to be computed each time.

Then it is appropriate to replace a being by a representation
- shorter (generally much shorter)
- more appropriate to the actions involved.

Nota : see in 1.4. notes about analog and digital representations

General laws on representations ? Grammar, semantics.

2. Numbers and data

galvanomètre.jpg

Typical example of a basically analog de ice,  but taking the (human) user to digitalize ; express a figure (here in practice with two meaningful digita). Nevertheless, such a device is sometimes used “analogically”, when the user gets some movements of the needle (rapid or slow move, oscillations…).

En salle de contrôle, voir Louis Richaud. En salle de contrôle, tableau de bord de la production. Informatique et gestion no 64 ergonomie, digital

User psychology (neursosciences) is fundamental in analog/digital HMI. The Sainte Odile Mount case.

It does not play the same way with purely machine systems, where the best is (more and more) to digitize the data as near as possible to the acquisition point, and to go back to analog only at the effecdtor level.

3. Digital

Numérique, numérisation, the French translations for digital, digitization (and scanning), are misconceptions. The French linguistic authorities have imposed "numerique" to translate the Globish "digital". That is a misconception. Indeed, the binary codes we use to store, process and transmit text, image and information in general are not numbers. They accept neither the structures nor (a fortiori) the operations valid on numbers. They are actually codes, ciphers. And, at the end of the day, the globish term "digital" is better than anyone else. So more (from a French standpoint), because it is built on a Latin root, digitus, finger, which provides a sound etymological basis for the intended meaning.

But analogy comes also at a purely formal level. By itself, the bit order, from weak to strong ones, is a form of analogy. Actually, the internal representation of integers breaks the analogy in order to enhance performance and reliability.

A number is not a digit. It may represented by a set of digits. But that is not always not necessary to use it or even to compute it, if one stays in the limits of formal calculus. (See Bailly-Longo).

N one integer defines one integer (positive)
Z elements are defined by two integers
Q elements are defined by two Z elements, hence four integer
R more complex
C complex numbers
Q quaternions

The DU model can build the real line.
The representation of a number may be more or less digital

Various representations of 8

huit, eight, ocho, otto, acht
7+1, 8 + 0,
15 - 5 , 15 - 0
2.4 , 8.1
80/10 , 8/1, (8*n)/n (n not equal to 0)
sqrt(64)
0000000000000000000008,000000000000000000
(8,1) (floating point)

rrrrr

1D vs 2D ?
the main problem is :
- convention, agreement on assembly structures
- way of operating of our brain ; or the rational operation, more 1 D than else
- reflexivity (part of convention)

4. Images

We think mainly of images as bitmaps. But vectorial and other formal representations of beings may be major, even in the expression process. Though, of course, in the digital world everything finally resolves in bits. But let us not confuse the bits of a formal text and the bits of the resulting image.

One can say that images are bitmaps; other ones are models.  But then what of vectorial images?

What does a bitmap brings as knowledge ?
1. Some global features and parameters, with simple additive processes : average color, average luminance, etc. Variety also may be roughly defined and comuted.
2. Distribution of values into the page: upper part lighter, centre more saturated See [COQ95]
3. General parameters as resolution, size, histograms
4. Pattern detection and recognition?

5. Model

The term model may be taken as

1. just a synonym of representation ; possibly simplified (comparable to a dummy, a prototype, a small-scale model)
2. a “system”, that is a set of coherent assertions, generally with some quantitative relations ; equations are a particular kind of assertions
3. a “canon”

Mainly in the second sense, the model is said to explain the being if it lets not only describe at any time, but also predicts the behaviour or the modelled being (possibly, imperfect prediction) with a precision for the needs of the user.  A being is said "explained" if there is a model of it, sufficient to simulate and predict the evolution of the being in time.

The length of the model is the KC (or at least a valuation of the KC, Kolmogorov complexity) of the modelled being. Normally, a model is shorter than the object it describes.

Then we can define the yield of a model as the ratio: length of the model/length of the modelled being, the quality of prediction taken into account.
ttttt

See here the “simplexity” concept. Eg. Delesalle.

In some case, the performance of a model may be evaluated automatically. It can evolve. There are different cases, depending on the availability of external information on the domain modelled. Or worse, when an enemy attempts to conceal as much as hi can.

??? If the model operates from a source, a critical point will be the sequence length. With possibly several nested lengths (e.g. the 8 bits of a byte, and the page separators. Burt there are other separators than those of fixed length systems. Find automatically the separators, etc.

bob.jpg

6. Varia

. Representations are object referring to other ones, and making it possible to these ones in a more economic way. In the classical discourse about computers and information systems, the reality is outside and representations value depends on this world. In DU, a major part of representations stand for themselves and may be used as such.
The classical kinds or representations are designed according to the human sensorial system. In DU, this is not pertinent as long as S has not to interact wih humans. Then, core features and behaviours matter more than appearance of spatial shape.

The key issue, when using a representation instead of the represented object, is efficiency... or simple possibility. Beyond the address/type which gives the basic access, the representation may be built "from outside", with sampling/scanning/rastering systems, or "from inside", wih vectorial representations or other formally linguistic representations. The traditional opposition of geometry to algebra, as explained for example in the Weil/.... debate, is based on human different apprehensions of the world. The algebraic one transposes directly in digital universesthrough formal languages (indeed, a the digital universes were borne largely out of the algebraic effort), but the classical geometrical view is no directly digital, and refers to deep "gestalt" or "gestual" features of human being and in particular its neural systems. Geometry, from that standpoint, could become more digital if these neural mechanims are, in the future, sufficiently well described to afford a linguistic formal description.

 

For a given system, R is a reprensentation of B if S is able to re-constitute B starting from R.

The simplest modes of reconstitution are :
- a pointer on (the address of) B itself
- a bit per bit copy of B in S.

Frequently, these two modes are impossible or inefficient.
- by address : B is far located, or does not exist any more, or not yet (B is an object to be made now or later)
- by copy : B is heavy, possibly heavier than the totality of S itself. Moreover, for some actions/processes, the important lies in certain features of B, which would have to be computed each time.

Then it is appropriate to replace B by a representation
- shorter (generally much shorter)
- more appropriate to the actions involved.

Let us says first that a complete reconstruction of B is frequently pointless, if even possible. Then, a simplified image will do better, as long as it is sufficient for the actions to be done.

Then, the construction of representations may be described generally as a division (or analysis), which demands an appropriate analyser (sometimes "parser"). Symmetrically, the generation of an object similar to B will be a "synthesis", using various kinds or generators.

7. Repetition and concatenation

If B is a long sequence of concatenated identical strings (possibly the same bit), B may be reduced to that string times the number of repetitions.

A more general case is the concatenation of words taken in a dictionary, and in general chosen in accordance with a set of syntactic and semantic rules.

Symmetries etc.

- B can be deduced from a representation R (stored in memory, for example), and some rather easy geometrical operation, or filter.

A lot of such operations can be listed, and, for a given S ( Roxame for example), constitute a generation system.

The full meaning of the work comes from a combination of the elementary meaning of elements (words, elementary forme), of the structures, and the wey they convey the meaning intende by the builder.

(And dont forget that dictionaries as well as grammars are built with bits).

Multidimensional deployment

De-streaming
Theorem of losses during generation.

8. Self representation

- Representation of the self
- Representation of a being “inside” this same being.

That is a major point, as all the "self", "diagonal" patterns. It points to the "conscience" issue with its inherent paradoxes. There are several parts :
- representation of self with its parts (mirror, homunculus), which may physically be done with a mirror and a camera, for instance ; more digitally with type and constituents
- representation of self in the environment, beginning with its own address and the beings round.

9. Autonomy of representations

Variable (in the computer acception) is a form of "meta" : the individual featured by its trace in the information system. And, when he dies, that trace is all what remains of him. The progress of IS is also a progress of each of us trace, indefinitely, with all these files, up to "behavioural databases".

Lamartine says to Nature :"vous que le temps épargne.... :" (thou, that time spares..) mais time spares the verses of Lamartine, who takes to us and forever (perhaps) the memory of his love, when the waters and rocks of Chambéry lake are dumb and deaf to day as well as in the time of Lamartine.

Once elaborated, the representations open the way to a generativity which go beyond their original scope. That is shown by Michel Serfati about the variables and exponents by Viète, Descartes and Leibniz.

expansion_compression.jpg
Expansion, compression and the main memory units.