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Omni-MATH / Find the largest integer n such that the following holds: there exists a set of n points in the plane such that, for any choice of three of them, some two are unit distance apart.

Problem

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problem

Find the largest integer nn such that the following holds: there exists a set of nn points in the plane such that, for any choice of three of them, some two are unit distance apart.
Plain-text mathematical notation (without MathML)
Find the largest integer n such that the following holds: there exists a set of n points in the plane such that, for any choice of three of them, some two are unit distance apart.
Original LaTeX notation
Find the largest integer $n$ such that the following holds: there exists a set of $n$ points in the plane such that, for any choice of three of them, some two are unit distance apart.

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Source and history

Official source

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