🌐EnglishEnglishDeutschFrançaisSvenskaРусский한국어中文日本語EntityQ864589· pop 6· linked from 20 articlesSchwarzian derivativenonlinear differential operator used to study conformal mappingsConnectionshypergeometric functionEntityRiemann surfaceEntityCategoriesComplex analysisConformal mappingsModular formsOrdinary differential equationsProjective geometry