For a minimal surface in the Euclidean 4-space, a semiumbilic point is at which its normal curvature vanishes. We prove that the semiumbilic points are isolated, if the normal curvature neither changes its sign nor vanishes identically. We also sh...
3-manifolds with positive flat conformal structure
Reiko, Aiyama;Kazuo, Akutagawa
Proc. Amer. Math. Soc. 140 3587-3592 2012年1月 [査読有り]
Lagrangian surfaces with circle symmetry in the complex two-space