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Article Dans Une Revue Advances in Applied Mathematics Année : 2021

On the Markov numbers: fixed numerator, denominator, and sum conjectures

Résumé

The Markov numbers are the positive integer solutions of the Diophantine equation x^2 + y^2 + z^2 = 3xyz. Already in 1880, Markov showed that all these solutions could be generated along a binary tree. So it became quite usual (and useful) to index the Markov numbers by the rationals from [0,1] which stand at the same place in the Stern-Brocot binary tree. The Frobenius' conjecture claims that each Markov number appears at most once in the tree. In particular, if the conjecture is true, the order of Markov numbers would establish a new strict order on the rationals. Aigner suggested three conjectures to better understand this order. The first one has already been solved for a few months. We prove that the other two conjectures are also true. Along the way, we generalize Markov numbers to any couple (p, q) ∈ N^2 (not only when they are relatively primes) and conjecture that the unicity is still true as soon as p ≤ q. Finally, we show that the three conjectures are in fact true for this superset.
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Dates et versions

hal-03013363 , version 1 (18-11-2020)

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  • HAL Id : hal-03013363 , version 1

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Clément Lagisquet, Edita Pelantová, Sébastien Tavenas, Laurent Vuillon. On the Markov numbers: fixed numerator, denominator, and sum conjectures. Advances in Applied Mathematics, 2021, 130, pp.102227. ⟨hal-03013363⟩
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