Prouhet–Thue–Morse constant

Prouhet–Thue–Morse constant

In mathematics and its applications, the Prouhet-Thue-Morse constant is the number au whose binary expansion .01101001100101101001011001101001... is given by the Prouhet-Thue-Morse sequence. That is,: au = sum_{i=0}^{infty} frac{t_i}{2^{i+1 = 0.412454033640 ldots

where t_i is the i-th element of the Prouhet-Thue-Morse sequence.

The generating series for the t_i is given by : au(x) = sum_{i=0}^{infty} (-1)^{t_i} , x^i = frac{1}{1-x} - 2 sum_{i=0}^{infty} t_i , x^iand can be expressed as

: au(x) = prod_{n=0}^{infty} ( 1 - x^{2^n} ). Note curiously that this is the product of Frobenius polynomials, and thus generalizes to arbitrary fields.

This number was shown to be transcendental by Kurt Mahler in 1929. [Kurt Mahler, "Arithmetische Eigenschaften der Lösungen einer Klasse von Funktionalgleichungen", "Math. Annalen", t. 101 (1929), p. 342–366.]


The Prouhet–Thue–Morse constant occurs as the angle of the Douady–Hubbard ray at the end of the sequence of western bulbs of the Mandelbrot set. This can be easily understood due to the nature of period doubling in the Mandelbrot set.


External links

* [ On-Line Encyclopedia of Integer Sequences Entry A010060]
* [ The ubiquitous Prouhet-Thue-Morse sequence] , John-Paull Allouche and Jeffrey Shallit, (undated, 2004 or earlier) provides many applications and some history
* [ PlanetMath entry]
* [ Parameter Ray Atlas] (2000) provides a link to the Mandelbrot set.

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