• Fundamental form IV and curvature formulas of the hypersphere 

      Güler, Erhan (2020-11-26)
      We study curvature formulas and the fourth fundamental form IV of hypersurfaces in the four dimensional Euclidean geometry E4. We calculate fourth fundamental form and curvatures for hypersurfaces, and also for hypersphere. ...
    • The fourth fundamental form of the torus hypersurface 

      Güler, Erhan (2020-12-10)
      We introduce the fourth fundamental form of the torus hypersurface in the four dimensional Euclidean space. We also compute I, II, III and IV fundamental forms of a torus hypersurface.