On the duality of generalised Euler formula for Euclidean hypersurfaces
Matrix transformations of some sequence spaces over N on -A Rchimedi an fields
On the rectilinear congruences generated by the instantaneous screwing axes connected with a surface
The Seifert - Van Kampen theorem for the group of global sections
A class of meromorphic univalent functions with positive and fixed finitely many coefficients