Argyros, I.K.George, S.2020-03-312020-03-312018Advances in Nonlinear Variational Inequalities, 2018, Vol.21, 2, pp.49-54https://idr.nitk.ac.in/handle/123456789/11564Galperin (2013) considered a class of secant-update iterative methods for solving nonlinear operator equations in Hilbert spaces and characterized optimal inverse secant-update of rank 1. In this study we improve the results in Galperin (2013). 2018 International Publications. All rights reserved.Article