Dwivedi, G.G.DwivediTyagi, J.J.Tyagi2025-08-302025-08-302015-12-0110.11650/tjm.19.2015.55662-s2.0-84949310255https://d8.irins.org/handle/IITG2025/21386In this article, we obtain several remarks on the qualitative questions such as Picone’s identity, Morse index and Hardy-Rellich type inequality for biharmonic operators.trueBi-Laplacian | Hardy-Rellich inequality | Morse index | Variational methodsArticlehttps://projecteuclid.org/journals/taiwanese-journal-of-mathematics/volume-19/issue-6/REMARKS-ON-THE-QUALITATIVE-QUESTIONS-FOR-BIHARMONIC-OPERATORS/10.11650/tjm.19.2015.5566.pdf1743-1758December 201511arJournal8