“…As a result, by applying these inequalities, we are able to obtain new results on intrinsic spectral properties of homogeneous spaces via extrinsic data which extend a well-known result of T. Nagano [17]. After that, the inequalities and the invariants of [3] were studied by many authors (see, for instance, [11,12,13,18,19]). Moreover, the affine version of δ-invariants and the inequalities was established in [8].…”