Close Lattice Points on Circles
Canadian journal of mathematics, Tome 61 (2009) no. 6, pp. 1214-1238

Voir la notice de l'article provenant de la source Cambridge University Press

We classify the sets of four lattice points that all lie on a short arc of a circle that has its center at the origin; specifically on arcs of length $t{{R}^{1/3}}$ on a circle of radius $R$ , for any given $t\,>\,0$ . In particular we prove that any arc of length ${{\left( 40\,+\frac{40}{3}\sqrt{10} \right)}^{1/3}}\,{{R}^{1/3}}$ on a circle of radius $R$ , with $R\,>\,\sqrt{65}$ , contains at most three lattice points, whereas we give an explicit infinite family of 4-tuples of lattice points, $\left( {{v}_{1,n}},\,{{v}_{2,n}},\,{{v}_{3,n}},\,{{v}_{4,n}} \right)$ , each of which lies on an arc of length ${{\left( 40+\frac{40}{3}\sqrt{10} \right)}^{1/3}}R_{n}^{1/3}\,+\,o\left( 1 \right)$ on a circle of radius ${{R}_{n}}$ .
DOI : 10.4153/CJM-2009-057-2
Mots-clés : 11N36
Cilleruelo, Javier; Granville, Andrew. Close Lattice Points on Circles. Canadian journal of mathematics, Tome 61 (2009) no. 6, pp. 1214-1238. doi: 10.4153/CJM-2009-057-2
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