An extension of the operator Kantorovich inequality

Y. Khatib, M. Hassani, M. Amyari

In this paper, we present an extension of Kantorovich inequality for two operators on a Hilbert space. Also, the multiple version and a related inequality for positive linear maps are obtained. Moreover, we introduce the concept of Specht's ratio and improve some inequalities related to Specht's ratio. 

Tbilisi Mathematical Journal, Vol. 13(4) (2020), pp. 183-191