Mathematics – Algebraic Geometry
Scientific paper
2006-05-11
Chaos, Solitons and Fractals 33, 4 (2007) 1095 - 1102
Mathematics
Algebraic Geometry
7 pages, 1 figure; Version 2: classification extended up to order 20, references updated; Version 3: classification extended u
Scientific paper
10.1016/j.chaos.2007.01.008
A compact classification of the projective lines defined over (commutative) rings (with unity) of all orders up to thirty-one is given. There are altogether sixty-five different types of them. For each type we introduce the total number of points on the line, the number of points represented by coordinates with at least one entry being a unit, the cardinality of the neighbourhood of a generic point of the line as well as those of the intersections between the neighbourhoods of two and three mutually distant points, the number of `Jacobson' points per a neighbourhood, the maximum number of pairwise distant points and, finally, a list of representative/base rings. The classification is presented in form of a table in order to see readily not only the fine traits of the hierarchy, but also the changes in the structure of the lines as one goes from one type to the other. We hope this study will serve as an impetus to a search for possible applications of these remarkable geometries in physics, chemistry, biology and other natural sciences as well.
Kibler Maurice
Planat Michel
Pracna Petr
Saniga Metod
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