# Wydawnictwa / Banach Center Publications / Wszystkie tomy

## A characterization of $n$-dimensional hypersurfaces in $R^{n+1}$ with commuting curvature operators

### Tom 69 / 2005

Banach Center Publications 69 (2005), 205-209 MSC: 53B20, 53B21. DOI: 10.4064/bc69-0-16

#### Streszczenie

Let $M^n$ be a hypersurface in $R^{n+1}$. We prove that two classical Jacobi curvature operators $J_x$ and $J_y$ commute on $M^n$, $n > 2$, for all orthonormal pairs $(x,y)$ and for all points $p \in M$ if and only if $M^n$ is a space of constant sectional curvature. Also we consider all hypersurfaces with $n\geq 4$ satisfying the commutation relation $(K_{x,y} \circ K_{z,u})(u) = (K_{z,u} \circ K_{x,y} )(u)$, where $K_{x,y} (u) = R(x, y, u)$, for all orthonormal tangent vectors $x, y, z, w$ and for all points $p \in M$.

#### Autorzy

• Yulian T. TsankovDepartment of Geometry
Faculty of Mathematics and Informatics
Sofia University “St. Kliment Ohridski”
Blvd. “J. Bourchier”, 5
1164 Sofia, Bulgaria
e-mail

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