Steiner systems ( schemes) and special features of the nanostructures symmetry description

The situation with description of nanostructures is much more complicated than, for example, for crystalline materials. In this case we have not used the classical crystallography. The order specified in a finite ordered set can always be enhanced to a linear order, which enables us to construct the incidence matrix for this set and, hence, to change over to algebraic constructions (including the aforementioned constructions of the projective geometry).