A global approach to the theory of special finsler manifolds

The aim of the present paper is to provide a global presentation of the theory of special Finsler manifolds. We introduce and investigate globally (or in- trinsically, free from local coordinates) many of the most important and most com- monly used special Finsler manifolds: locally Minkowskian, Berwald, Landesberg, general Landesberg, P-reducible, C-reducible, semi-C-reducible, quasi-C-reducible, P ∗ -Finsler, C h -recurrent, C v -recurrent, C 0 -recurrent, S v -recurrent, S v -recurrent of the second order, C2-like, S3-like, S4-like, P2-like, R3-like, P-symmetric, h-isotropic, of scalar curvature, of constant curvature, of p-scalar curvature, of s-ps-curvature. The global definitions of these special Finsler manifolds are introduced. Various relationships between the different types of the considered special Finsler manifolds are found. Many local results, known in the literature, are proved globally and several new results are obtained. As a by-product, interesting identities and properties concerning the torsion tensor fields and the curvature tensor fields are deduced. Although our investigation is entirely global, we provide; for comparison rea- sons, an appendix presenting a local counterpart of our global approach and the local definitions of the special Finsler spaces considered. 1