Extreme Value Theory for Hurwitz Complex Continued Fractions

Entropy (Basel). 2021 Jun 30;23(7):840. doi: 10.3390/e23070840.


The Hurwitz complex continued fraction is a generalization of the nearest integer continued fraction. In this paper, we prove various results concerning extremes of the modulus of Hurwitz complex continued fraction digits. This includes a Poisson law and an extreme value law. The results are based on cusp estimates of the invariant measure about which information is still limited. In the process, we obtained several results concerning the extremes of nearest integer continued fractions as well.

Keywords: complex continued fractions; extreme value theory; poisson law; ψ-mixing.