EntityQ2617832· pop 15· linked from 226 articlesPoincaré disk modelSign in to savemodel of hyperbolic geometryConnectionshyperbolic geometryEntityPoincaré half-plane modelEntityBeltrami–Klein modelEntityinversive geometryEntitygeometryEntityInternational Standard Book NumberEntitycircleEntitycomplex numberEntityHenri PoincaréEntitylineEntitysphereEntitypointEntityBernhard RiemannEntitydiameterEntitydigital object identifierEntityInternational Standard Serial NumberEntityEuclidean geometryEntityM. C. EscherEntityanalytic geometryEntityabsolute zeroEntityCategoriesHenri PoincaréHyperbolic geometryMulti-dimensional geometry