EntityQ939725· pop 13· linked from 54 articlesfirst fundamental formSign in to saveConnectionsdifferential geometry of surfacesEntityCarl Friedrich GaussEntityequatorEntitysphereEntityscalar productEntitydifferential geometryEntityEuclidean spaceEntitypartial derivativeEntitycurvatureEntitysymmetric matrixEntityRiemannian geometryEntityinner product spaceEntitymetric tensorEntitytangent spaceEntityRiemann curvature tensorEntityGaussian curvatureEntityTheorema EgregiumEntityradius of curvatureEntityRicci curvatureEntitycanonical formEntityCategoriesDifferential geometryDifferential geometry of surfacesSurfaces