EntityQ3258885· pop 11· linked from 184 articlesupper half-planeSign in to savecomplex numbers with positive imaginary partConnectionsCartesian coordinate systemEntitycomplex numberEntityhyperbolic geometryEntitymathematicsEntitynumber theoryEntityreal numberEntitydimensionEntityplaneEntityabsolute valueEntitysurfaceEntitypolar coordinate systemEntitycomplex analysisEntitydifferential geometryEntitymetric spaceEntityunionEntityunit circleEntitydomain of a functionEntitycomplex planeEntitypositive real numberEntityRiemann surfaceEntityCategoriesComplex analysisDifferential geometryHyperbolic geometryModular formsNumber theory