Geodesic
On the number of lattice points of linear comparison solutions in rectangular areas
Čebyševskij sbornik, Tome 24 (2023) no. 4, pp. 311-324

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In the theory of the hyperbolic zeta function of lattices, a significant role is played by the Bakhvalov theorem, in which the magnitude of the zeta function of the lattice of linear comparison solutions is estimated through the hyperbolic lattice parameter. In N. M. Korobov's 1963 monograph, this theorem is proved by a method different from the original work of N. S. Bakhvalov. In this method, the central role is played by the lemma about the number of linear comparison solutions in a rectangular area. In 2002, V. A. Bykovsky obtained fundamentally new estimates from below and from above, which coincided in order. The paper gives new estimates of the number of lattice points of linear comparison solutions in rectangular regions. This allows us to prove the strengthened Bakhvalov—Korobov—Bykovsky theorem on the estimate of the hyperbolic zeta function of the lattice of linear comparison solutions. The difference between the theorem on the number of lattice points of solutions to linear comparison in rectangular areas and the corresponding Korobov lemma is that instead of an estimate through the ratio of the volume of a rectangular area to the hyperbolic parameter, a modified Bykovsky estimate is given through minimal solutions to linear comparison. The use of the theorem on the number of lattice points of solutions to linear comparison in rectangular domains is supplemented by the generalized Korobov lemma on estimates of the residual series and a number of other modifications in the proof of the Bakhvalov—Korobov theorem, which made it possible to prove the strengthened Bakhvalov—Korobov—Bykovsky theorem on estimates hyperbolic zeta function of the lattice of linear comparison solutions.
Keywords: parallelepipedal grid, quadrature formulas, method of optimal coefficients, quantitative measure of grid quality. 
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     author = {N. K. Ter-Gukasova and M. N. Dobrovolsky and N. N. Dobrovol'skii and N. M. Dobrovol'skii},
     title = {On the number of lattice points of linear comparison solutions in rectangular areas},
     journal = {\v{C}eby\v{s}evskij sbornik},
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     year = {2023},
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     url = {http://geodesic.mathdoc.fr/item/CHEB_2023_24_4_a17/}
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N. K. Ter-Gukasova; M. N. Dobrovolsky; N. N. Dobrovol'skii; N. M. Dobrovol'skii. On the number of lattice points of linear comparison solutions in rectangular areas. Čebyševskij sbornik, Tome 24 (2023) no. 4, pp. 311-324. http://geodesic.mathdoc.fr/item/CHEB_2023_24_4_a17/