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Summary

Description
English: The 8-element set {1, 2, 4, 5, 10, 11, 13, 14} is a Salem–Spencer set, meaning that it has no three elements forming an arithmetic progression. For each pair of two numbers from the set, their midpoint (one of the 28 yellow points) is outside the set, preventing those two numbers from being the first and last element of an arithmetic progression.
Date
Source Own work
Author David Eppstein

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An 8-element Salem–Spencer set

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3 February 2019

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Date/TimeThumbnailDimensionsUserComment
current02:31, 4 February 2019Thumbnail for version as of 02:31, 4 February 2019540 × 414 (3 KB)David EppsteinUser created page with UploadWizard

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