%0 Journal Article %T On the Moore Formula of Compact Nilmanifolds %A Hatem Hamrouni %J Symmetry, Integrability and Geometry : Methods and Applications %D 2009 %I National Academy of Science of Ukraine %X Let G be a connected and simply connected two-step nilpotent Lie group and ¦£ a lattice subgroup of G. In this note, we give a new multiplicity formula, according to the sense of Moore, of irreducible unitary representations involved in the decomposition of the quasi-regular representation Ind_¦£^G(1). Extending then the Abelian case. %K nilpotent Lie group %K lattice subgroup %K rational structure %K unitary representation %K Kirillov theory %U http://dx.doi.org/10.3842/SIGMA.2009.062