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The function defined by Minkowski for the purpose of mapping the quadratic surds in the open interval into the rational numbers of in a continuous, order-preserving manner. takes a number having continued fraction to the number
(1) |
The function satisfies the following properties (Salem 1943).
1. is strictly increasing.
2. If is rational, then is of the form , with and integers.
3. If is a quadratic surd, then the continued fraction is periodic, and hence is rational.
4. The function is purely singular (Denjoy 1938).
can also be constructed as
(2) |
where and are two consecutive irreducible fractions from the Farey sequence. At the th stage of this definition, is defined for values of , and the ordinates corresponding to these values are for , 1, ..., (Salem 1943).
The function satisfies the identity
(3) |
A few special values include
(4) |
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(5) |
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(6) |
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(7) |
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(8) |
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(9) |
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(10) |
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(11) |
where is the golden ratio.
REFERENCES:
Bailey, D. H.; Borwein, J. M.; Calkin, N. J.; Girgensohn, R.; Luke, D. R.; and Moll, V. H. Experimental Mathematics in Action. Wellesley, MA: A K Peters, pp. 237-238, 2007.
Conway, J. H. "Contorted Fractions." On Numbers and Games, 2nd ed. Wellesley, MA: A K Peters, pp. 82-86 (1st ed.), 2000.
Denjoy, A. "Sur une fonction réelle de Minkowski." J. Math. Pures Appl. 17, 105-155, 1938.
Girgensohn, R. "Constructing Singular Functions via Farey Fractions." J. Math. Anal. Appl. 203, 127-141, 1996.
Kinney, J. R. "Note on a Singular Function of Minkowski." Proc. Amer. Math. Soc. 11, 788-794, 1960.
Minkowski, H. "Zur Geometrie der Zahlen." In Gesammelte Abhandlungen, Vol. 2. New York: Chelsea, pp. 44-52, 1991.
Salem, R. "On Some Singular Monotone Functions which Are Strictly Increasing." Trans. Amer. Math. Soc. 53, 427-439, 1943.
Tichy, R. and Uitz, J. "An Extension of Minkowski's Singular Functions." Appl. Math. Lett. 8, 39-46, 1995.
Viader, P.; Paradis, J.; and Bibiloni, L. "A New Light on Minkowski's Function." J. Number Th. 73, 212-227, 1998.
Yakubovich, S. "The Affirmative Solution to Salem's Problem Revisited." 31 Dec 2014. https://arxiv.org/abs/1501.00141.
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