For a Contiguity based geometry .pdf
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For a contiguitybased geometry
Reference:  On contiguous point spaces, Theodore Hailperin, University of Michigan,
1939.

Esquisse d'une Sémiophysique, René Thom, Inter Editions 1988, preamble
p12 et 13, about O, a point which splits into O1 and O2, that is two
different points that are adjacent.
A1 The circle and the AB line segment are contiguous in C and D.
A2 AB, CD and EF are three welldefined line segments.
A3 Each of these three linesegments are contiguous with the two others, forming
a triangle which has no vertices.
B1 By varying the size of different line segments, we developed the idea that each
is in fact constituted of a group of contiguous points.
B2 By induction we may postulate the existence of a geometry plane made entirely
of contiguous points. We’ll call it a contiguity plane.
We might have used another way to construct this triangle:
D
A
B
C
A
B
C
D
E
F
FA
ED
CB
C1
Determine three different points and connect them by linesegments,
C2
Or draw three intersecting lines.
However, these two last methods would have made appear new geometry
elements which didn’t exist on the original shape: the three vertices, the
continuous linesegments. It would also have removed previously existing
elements: the three pairs of contiguous points.
D The same issue arises using algebra. For example, using an affine frame will
create new elements:

Coordinates for each vertex of the triangle.
Coordinates for each of the three intersecting lines.
Algebra has not only created elements that were not part of the original shape (the
vertices, continuous segments), it removed as well original elements (the contiguity)
E Using algebra and a continuous frame to work on a contiguous plane will make
appear elements that do not exist: cusps, flat spots, inflection points (actually, pairs of
contiguous points) which show up, in an algebraic curve, as a singular point.
Following the same reasoning: by placing A over F, C over B and E over D, we get
another contiguity plane, over which algebra of curves makes appear other singular points
that don’t exist: double or triple points, which are in fact pairs of contiguous points.
In conclusion, applying algebraic geometry to physics will show singularities that
might not even exist. By analogy, we may relate these two situations: if a changing of frame
may result in the disappearance of pseudosingularities, switching from a continuous
geometry to a contiguous geometry may have the same effect.
Béthune 03/09/2017
chantal.capron@neuf.fr
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