olymmath

KöMaL 2022 A823

    For positive integers nn consider the lattice points Sn={(x,y,z) ⁣:1≤x≤nS_n=\big\{(x,y,z)\colon 1\le x\le n, 1≤y≤n1\le y\le n, 1≤z≤n1\le z\le n, x,y,z∈N}x,y,z\in \mathbb{N}\big\}. Is it possible to find a positive integer nn for which it is possible to choose more than nnn\sqrt{n} lattice points from SnS_n such that for any two chosen lattice points at least two of the coordinates of one is strictly greater than the corresponding coordinates of the other?

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