Athira, S.K.Johnson, P.S.Kamaraj, K.2026-02-052020Australian Journal of Mathematical Analysis and Applications, 2020, 17, 2, pp. 1-10https://idr.nitk.ac.in/handle/123456789/24115Various norms can be defined on a Krein space by choosing different underlying fundamental decompositions. Some estimates of norms on Krein spaces are discussed and a few results in Bognar’s paper are generalized. © 2020. Austral Internet Publishing. All Rights Reserved.Fundamental decompositionJ-norm.Krein space