Continued fractions for $q$-deformed real numbers, $\{-1,0,1\}$-Hankel determinants, and Somos-Gale-Robinson sequences

Abstract

$q$-deformed real numbers are power series with integer coefficients. We study Stieltjes and Jacobi type continued fraction expansions of $q$-deformed real numbers and find many new examples of such continued fractions. We also investigate the corresponding sequences of Hankel determinants and find an infinite family of power series for which several of the first sequences of Hankel determinants consist of $-1,0$ and $1$ only. These Hankel sequences satisfy Somos and Gale-Robinson recurrences.

Second and final version, 31 pages, to appear in Adv. in Appl. Math. We have mainly simplified the presentation, clarified some statements, and corrected and improved the main conjecture

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• A special class of Hankel determinants
• $q$-deformed rational numbers and the 2-Calabi--Yau category of type $A_2$
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