4 http://hdl.handle.net/10338.dmlcz/104877 4 A surface in a space with projective connexion http://hdl.handle.net/10338.dmlcz/104882 A surface in a space with projective connexion Biorthogonal systems and bases in Banach space (Preliminary note) http://hdl.handle.net/10338.dmlcz/104881 Biorthogonal systems and bases in Banach space (Preliminary note) On interations of bounded linear operators and Kellog's iterations in not self-adjoint eigenvalue problems http://hdl.handle.net/10338.dmlcz/104880 On interations of bounded linear operators and Kellog's iterations in not self-adjoint eigenvalue problems Note on the paper of I. Fenyö: On the solution of non-linear equations in Banach space http://hdl.handle.net/10338.dmlcz/104879 Note on the paper of I. Fenyö: On the solution of non-linear equations in Banach space