Geodesic
Repercussions of a Problem of Erdős and Ulam on Density Ideals
Canadian journal of mathematics, Tome 42 (1990) no. 5, pp. 902-914

Voir la notice de l'article provenant de la source Cambridge University Press

By P(ω) we denote the Boolean algebra of all subsets of the set ω of natural numbers. We identify each natural number with the set of its predecessors and define: the ideal of sets of density zero, and the ideal of sets of logarithmic density zero. 
Just, Winfried. Repercussions of a Problem of Erdős and Ulam on Density Ideals. Canadian journal of mathematics, Tome 42 (1990) no. 5, pp. 902-914. doi: 10.4153/CJM-1990-047-5
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