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单词 UniquenessConjectureForMarkovNumbers
释义

uniqueness conjecture for Markov numbers


Conjecture. Given a Markov numberMathworldPlanetmath z>1, there are several other Markov numbers x and y such that x2+y2+z2=3xyz, but there is only set of values of x and y satisfying the inequality z>yx.

The conjecture is easy enough to check for small values. For example, for z=5, we could even test x and y we know not to be Markov numbers with minimum increase in computational overhead. Trying the triples in order: (1, 1, 5), (1, 2, 5), (1, 3, 5), (1, 4, 5), (2, 1, 5), … (4, 4, 5) against 15xy-(x2+y2+25) we obtain the sequenceMathworldPlanetmath -12, 0, 10, 18, 0, 27, 52, 75, 10, 52, 92, 130, 18, 75, 130, 183. It doesn’t take significantly larger Markov numbers to show the need for a general proof of uniqueness. Many attempted proofs have been submitted, but Richard Guy dismisses them all as seemingly faulty.

A divide-and-conquer approach to the problem has yielded encouraging results, however. Baragar proved the uniqueness of prime Markov numbers p as well as semiprimes 2p. Schmutz then proved the uniqueness of Markov numbers of the forms pn and 2pn. Ying Zhang used these results to extend this to 4pn and 8pn.

References

  • 1 R. K. Guy, Unsolved Problems in Number TheoryMathworldPlanetmathPlanetmath New York: Springer-Verlag 2004: D12
  • 2 Ying Zhang, “CongruenceMathworldPlanetmathPlanetmathPlanetmath and Uniqueness of Certain Markov Numbers” Acta Arithmetica 128 3 (2007): 297
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更新时间:2025/5/4 20:12:37