--quasigroups.
The cohomological structure of hypersphere arragnements is given. The Gauss-Manin connections for related hypergeometrtic integrals are given in terms of invariant forms. They are used to get the explicit differential formula for the volume of a simplex whose faces are hyperspheres.
Let be a disjoint iteration group on the unit circle , that is a family of homeomorphisms such that for , and each either is the identity mapping or has no fixed point ( is a -divisible nontrivial Abelian group). Denote by the set of all cluster points of , for . In this paper we give a general construction of disjoint iteration groups for which .