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ON SOME GEOMETRIC PROPERTIES OF QUADRIC SURFACES IN EUCLIDEAN SPACE

  • Ali, Ahmad T. (King Abdul Aziz University, Faculty of Science, Department of Mathematics, Mathematics Department, Faculty of Science, Al-Azhar University) ;
  • Aziz, H.S. Abdel (Department of Mathematics, Faculty of Science, Sohag University) ;
  • Sorour, Adel H. (Department of Mathematics, Faculty of Science, Sohag University)
  • Received : 2015.03.23
  • Accepted : 2015.08.20
  • Published : 2016.09.25

Abstract

This paper is concerned with the classifications of quadric surfaces of first and second kinds in Euclidean 3-space satisfying the Jacobi condition with respect to their curvatures, the Gaussian curvature K, the mean curvature H, second mean curvature $H_{II}$ and second Gaussian curvature $K_{II}$. Also, we study the zero and non-zero constant curvatures of these surfaces. Furthermore, we investigated the (A, B)-Weingarten, (A, B)-linear Weingarten as well as some special ($C^2$, K) and $(C^2,\;K{\sqrt{K}})$-nonlinear Weingarten quadric surfaces in $E^3$, where $A{\neq}B$, A, $B{\in}{K,H,H_{II},K_{II}}$ and $C{\in}{H,H_{II},K_{II}}$. Finally, some important new lemmas are presented.

Keywords

References

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