. "230621" . . "RIV/00216224:14310/11:00074564" . "Verpoort, Steven J." . "P(LC505)" . . "2" . "10.1007/s10231-010-0150-5" . . . "[7B2DFB27FCA3]" . "190" . "000289365500006" . "Some Modifications of the Theorem of Beltrami"@en . "1"^^ . . "RIV/00216224:14310/11:00074564!RIV15-MSM-14310___" . "14310" . "1"^^ . "Some Modifications of the Theorem of Beltrami" . . "18"^^ . . "Verpoort, Steven J." . "The two main topics of this text are as follows: Firstly, three modifications of the theorem of Beltrami will be presented for diffeomorphisms between Riemannian manifolds and a space form which preserve the geodesic circles, the geodesic hyperspheres, or the minimal surfaces, respectively. Secondly, it is defined what it means for an infinitesimal deformation of a metric to preserve the geodesics up to first order, and a corresponding infinitesimal version of Beltrami's theorem is given." . "Some Modifications of the Theorem of Beltrami" . . . "Theorem of Beltrami"@en . . . "DE - Spolkov\u00E1 republika N\u011Bmecko" . "The two main topics of this text are as follows: Firstly, three modifications of the theorem of Beltrami will be presented for diffeomorphisms between Riemannian manifolds and a space form which preserve the geodesic circles, the geodesic hyperspheres, or the minimal surfaces, respectively. Secondly, it is defined what it means for an infinitesimal deformation of a metric to preserve the geodesics up to first order, and a corresponding infinitesimal version of Beltrami's theorem is given."@en . "Some Modifications of the Theorem of Beltrami"@en . "Annali di Matematica Pura ed Applicata" . "0373-3114" .