🌐EnglishEnglishDeutschEspañolNederlandsPortuguêsSvenskaРусский한국어中文日本語EntityQ3258885· pop 11· linked from 184 articlesupper half-planeAlso known as complex upper half-planecomplex numbers with positive imaginary partAvailable in 11 languagesDeutsch中文日本語РусскийPortuguêsNederlandsRomanianSvenskaUkrainian한국어via Wikidata sitelinks · CC0ConnectionsCartesian coordinate systemEntitycomplex numberEntityCategoriesComplex analysisDifferential geometryHyperbolic geometryModular formsNumber theory