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In this study, the dual-hyperbolic Fibonacci and dual-hyperbolic Lucas numbers are introduced. Then, the fundamental identities are proven for these numbers. Additionally, we give the identities regarding negadual-hyperbolic Fibonacci and negadual-hyperbolic Lucas numbers. Finally, Binet formulas, D’Ocagne, Catalan and Cassini identities are obtained for dual-hyperbolic Fibonacci and dual-hyperbolic Lucas numbers.

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In this paper, dual-complex Fibonacci numbers with generalized Fibonacci and Lucas coefficients are defined. Generating function is given for this number system. Binet's formula is obtained by the help of this generating function. Then, well-known Cassini, Catalan, d'Ocagne's, Honsberger, Tagiuri and other identities are given for this number system. Finally, it is seen that the theorems and the equations which are obtained for the special values p = 1 and q = 0 correspond to the theorems and identities in [2].

We have introduced the ruled surfaces which are generated from the type-2 Bishop vectors. Then, we have calculated Gaussian curvatures, mean curvatures and integral invariants of these surfaces. Also the fundamental forms, geodesic curvatures, normal curvatures and geodesic torsions are calculated and some results are obtained.

In this paper, the involute-evolute curve concept has been defined according to two type modified orthogonal frames at non-zero points of curvature and torsion in the Euclidean space E^3 , respectively. Later, the characteristic theorems related to the distance between the corresponding points of these curves have been given. Besides, the relations have been found between the curvatures and also torsions of the two type the involute-evolute modified orthogonal pairs.

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ÖZBu çalışmada 1975 yılında L. R. Bishop tarafından tanımlanan Bishop çatısına ait eğrilikliklerin geometrik anlamları verildi. Daha sonra 1850 yılında Bertrand'ın tanımladığı Bertrand eğri çiftlerinin Bishop vektörleri arasındaki bağıntılar elde edildi. Ayrıca bu Bertrand eğri çiftlerinin paralel eğri olması durumunda bazı ilginç sonuçlar elde edildi. ABSTRACTIn this paper, the geometric meanings of the curvatures belong to Bishop frame, which was defined by L.R. Bishop in 1975, has been given. Afterwards, the relations between the Bishop vectors of Bertrand curve couple, which Bertrand defined in 1850, has been obtained. Furthermore, some interesting results have been found when these curves become parallel curves.