Genealogical numbering systems

The Kekule number, also called numbering according to the Sosa - Stradonitz system or short Sosa number, denotes a person's number in a list or ancestral pedigree by Stephan Kekule von Stradonitz. This numbering, which has established itself internationally, was first used in 1590 by Michael Eyzinger, then again in 1676 by ​​Jerome de Sosa and 1883 by Francis Galton.

The respondent receives regardless of gender, the number 1, number 2, his father, the mother, the number 3 If a person has the number n (eg 2 for the father ), then their father is assigned the number 2 · n (ie duplication and therefore the number 4 for the paternal grandfather of the subject ), the parent 2 · n 1 (in this case the 5). The father of 10 is assigned the number 20, the mother is given the number 21

All male ancestors, accordingly, have even numbers, all female odd.

The respondent and the ancestors generations I to IV are therefore assigned the following numbers:

Generation 0 1 ( Volunteer) ______________ | ________________                                  | | Generation I 2 3 (Parents) _______ | ______________ | _______                          | | | | Generation II 4 5 6 7 (Grandparents ) ___ | ______ | ______ | ______ | ___                      | | | | | | | | Generation III 8 9 10 11 12 13 14 15 ( Great-grandparents ) _ | __ | __ | __ | __ | __ | __ | __ | _                    | | | | | | | | | | | | | | | | Generation IV 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 By ancestor loss, it is possible that some of the ancestors gets more Kekule numbers.

Properties

The generation number can be determined by each Kekule number by the logarithm to base 2:

Here, it is assumed that the generation 0 represents the subjects ( Kekule No. 1).

Other relationships are:

Number of relatives when viewed from generations: