"hyperquadrics" meaning in English

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          "ref": "2015, Hiroshi Iriyeh, Hui Ma, Reiko Miyaoka, Yoshihiro Ohnita, “Hamiltonian non-displaceability of Gauss images of isoparametric hypersurfaces”, in arXiv:",
          "text": "In this article we study the Hamiltonian non-displaceability of Gauss images of isoparametric hypersurfaces in the spheres as Lagrangian submanifolds embedded in complex hyperquadrics..",
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          "ref": "2015, Hiroshi Iriyeh, Hui Ma, Reiko Miyaoka, Yoshihiro Ohnita, “Hamiltonian non-displaceability of Gauss images of isoparametric hypersurfaces”, in arXiv:",
          "text": "In this article we study the Hamiltonian non-displaceability of Gauss images of isoparametric hypersurfaces in the spheres as Lagrangian submanifolds embedded in complex hyperquadrics..",
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