🌐日本語EnglishDeutschFrançaisItalianoNederlandsPolskiPortuguêsSvenskaРусский中文日本語EntityQ1991239· pop 13· linked from 17 articles等差数列に関するエルデシュ予想Characterization of large setsAvailable in 13 languagesFrançaisDeutsch中文РусскийPortuguêsItalianoCzechGreekConnectionsInternational Standard Book NumberEntitydigital object identifierEntityCategoriesCombinatoricsConjecturesUnsolved problems in mathematics