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On functions with bounded remainder

P. HellekalekGerhard Larcher — 1989

Annales de l'institut Fourier

Let T : / / be a von Neumann-Kakutani q - adic adding machine transformation and let ϕ C 1 ( [ 0 , 1 ] ) . Put ϕ n ( x ) : = ϕ ( x ) + ϕ ( T x ) + ... + ϕ ( T n - 1 x ) , x / , n . We study three questions: 1. When will ( ϕ n ( x ) ) n 1 be bounded? 2. What can be said about limit points of ( ϕ n ( x ) ) n 1 ? 3. When will the skew product ( x , y ) ( T x , y + ϕ ( x ) ) be ergodic on / × ?

On the discrepancy of sequences associated with the sum-of-digits function

Gerhard LarcherN. KopecekR. F. TichyG. Turnwald — 1987

Annales de l'institut Fourier

If w = ( q k ) k N denotes the sequence of best approximation denominators to a real α , and s α ( n ) denotes the sum of digits of n in the digit representation of n to base w , then for all x irrational, the sequence ( s α ( n ) · x ) n N is uniformly distributed modulo one. Discrepancy estimates for the discrepancy of this sequence are given, which turn out to be best possible if α has bounded continued fraction coefficients.

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