THE BERTRAND OFFSETS OF RULED SURFACES IN
E. KASAP, N. KURUOGLU
The problem of finding a curve whose principal normals are also the principal normals of another curve was apparently first proposed by Saint-Venant but solved by J. Bertrand. Such curves were referred to as ‘Bertrand offsets’. In this paper, a generalization of the theory of Bertrand curves is presented for ruled surfaces in Minkowski space