On Ξ-principal directions of a congruenc
β
C. M. Prasad
π
Article
π
1973
π
John Wiley and Sons
π
English
β 443 KB
## Abstract In the existing literature of FINSLER spaces, it has been stressed [ELIOPOULOS 1959, RUND 1956] that the process of Ξβdifferentiation leads to the use of DUPIN's indicatrix in finding out the principal directions at a point of a hypersurface which are indeterminate. The process of Ξβdif