🌐EnglishEnglishEspañolFrançaisNederlandsРусский한국어中文日本語EntityQ3001220· pop 9· linked from 64 articlesmodular curvealgebraic curve constructed as a quotient of the complex upper half-plane by the action of a congruence subgroup of the modular group of integral 2×2 matricesAvailable in 9 languagesEspañolFrançais中文日本語РусскийNederlandsSlovenian한국어via Wikidata sitelinks · CC0Connectionsgroup actionEntitycompact spaceEntityCategoriesAlgebraic curvesModular formsRiemann surfaces