The semigroup of nonempty finite subsets of rationals.
The sequence of fractional parts of roots
We study the function , where θ is a positive real number, ⌊·⌋ and · are the floor and fractional part functions, respectively. Nathanson proved, among other properties of , that if log θ is rational, then for all but finitely many positive integers n, . We extend this by showing that, without any condition on θ, all but a zero-density set of integers n satisfy . Using a metric result of Schmidt, we show that almost all θ have asymptotically (log θ log x)/12 exceptional n ≤ x. Using continued...
The set of rational cycles for the 3x+1 problem
Theoretical and computational bounds for m-cycles of the 3n+1-problem
Théorie additive des nombres et problème de Waring
Three problems for polynomials of small measure
Tilings associated with beta-numeration and substitutions.
Tournament sequences and Meeussen sequences.
Trajectories of rotations
Two game-set inequalities.
Two generalized constants related to zero-sum problems for two special sets.