Ricci and Casorati Principal Directions of Wintgen Ideal Submanifolds
Simona Decu, Miroslava Petrović-Torgašev, Aleksandar Šebeković, Leopold Verstraelen
We show that for Wintgen ideal submanifolds in real space forms the (intrinsic) Ricci principal directions and the (extrinsic) Casorati principal directions coincide.