Some problems in number theory, combinatorics and combinatorial geometry.
On some problems in combinatorial set theory.
Vertex covering with monochromatic paths.
Dot product rearrangements.
Rainbow Hamiltonian paths and canonically colored subgraphs in infinite complete graphs.
On cycles in the coprime graph of integers.
Über eine Fragestellung von Gaier und Meyer-König.
Über die Zahlen der Form ...(n) - n und n - ...(n).
Some remarks on subgroups of real numbers
Some personal reminiscences of the mathematical work of Paul Turán
Remarks on number theory II. Some problems on the σ function
Some remark on Euler's φ function
Remarks on number theory III. On addition chains
Extensions de quelques théorèmes de densité
Density Functions for Prime and Relatively Prime Numbers.
Congruent subsets of infinite sets of natural numbers.
On the largest prime factors of n and n+1. (Short Communication).
On a geometric property of Lemniscates.
On the largest prime factors of n and n+1.
On a geometric property of Lemniscates. (Short Communication).
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