Athira S.K.Johnson P.S.Kamaraj K.2021-05-052021-05-052020Australian Journal of Mathematical Analysis and Applications Vol. 17 , 2 , p. 1 - 10https://doi.org/https://idr.nitk.ac.in/handle/123456789/16213Various 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.Article