EntityQ205124· pop 10· linked from 73 articlesFuchsian groupSign in to savediscrete subgroup of the real projective special linear group of dimension 2Connectionsgroup actionEntityMöbius transformationEntityunit diskEntityupper half-planeEntitySL2(R)Entitytriangle groupEntitymathematicsEntityInternational Standard Book NumberEntityHenri PoincaréEntityrational numberEntitydigital object identifierEntityInternational Standard Serial NumberEntitygroupEntityEuclidean geometryEntityM. C. EscherEntitynon-Euclidean geometryEntityabelian groupEntityhyperbolic geometryEntityopen setEntitytraceEntityCategoriesDiscrete groupsFractalsHyperbolic geometryKleinian groupsRiemann surfaces