00520nam a22001817a 4500 117506 117505 OSt 20260706113050.0 220305b ||||| |||| 00| 0 eng d 9789380250625 517.9 KES Kesavan,S 608 Functional analysis by Kesavan S Delhi Hindustan book agency 2017 269 Texts and readings in mathematics 52 1308 Normed linear spaces Hilbert spaces Compact operators ddc BK