Functional analysis : an introduction 2026-02-15T23:11:24+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Eidelman, Yuli, 1955-; Tsolomitis, Antonis (Graduate studies in mathematics,, 2004)