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Mod 2 normal numbers and skew products

Geon Ho ChoeToshihiro HamachiHitoshi Nakada — 2004

Studia Mathematica

Let E be an interval in the unit interval [0,1). For each x ∈ [0,1) define dₙ(x) ∈ 0,1 by d ( x ) : = i = 1 n 1 E ( 2 i - 1 x ) ( m o d 2 ) , where t is the fractional part of t. Then x is called a normal number mod 2 with respect to E if N - 1 n = 1 N d ( x ) converges to 1/2. It is shown that for any interval E ≠(1/6, 5/6) a.e. x is a normal number mod 2 with respect to E. For E = (1/6, 5/6) it is proved that N - 1 n = 1 N d ( x ) converges a.e. and the limit equals 1/3 or 2/3 depending on x.

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