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On $q$-deformed Farey sum and a homological interpretation of $q$-deformed real quadratic irrational numbers

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arxiv 2210.06056 v5 pith:VHFN2GQI submitted 2022-10-12 math.RT math.COmath.NT

classification math.RTmath.COmath.NT
keywords deformedhomologicalleftnumbersrationalfareygivecontinued
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abstract

The left and right $q$-deformed rational numbers were introduced by Bapat, Becker and Licata via regular continued fractions, and they gave a homological interpretation for left and right $q$-deformed rational numbers. In the present paper, we focus on negative continued fractions and defined left $q$-deformed negative continued fractions. We give a formula for computing the $q$-deformed Farey sum of the left $q$-deformed rational numbers based on it. We use this formula to give a combinatorial proof of the relationship between the left $q$-deformed rational number and the Jones polynomial of the corresponding rational knot which was proved by Bapat, Becker and Licata using a homological technique. Finally, we combine their work and the $q$-deformed Farey sum, and give a homological interpretation of the $q$-deformed Farey sum. We also give an approach to finding a relationship between real quadratic irrational numbers and homological algebra.

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