  For a germ of a quasihomogeneous function with an isolated critical point at
the origin invariant with respect to an appropriate action of a finite abelian
group, H. Fan, T. Jarvis, and Y. Ruan defined the so-called quantum cohomology
group. It is considered as the main object of the quantum singularity theory
(FJRW-theory). We define orbifold versions of the monodromy operator on the
quantum (co)homology group, of the Milnor lattice, of the Seifert form and of
the intersection form. We also describe some symmetry properties of invariants
of invertible polynomials refining the known ones.
