Methods of mathematical physics 2026-02-15T18:25:20+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Courant, Richard, 1888-1972; Hilbert, David, 1862-1943 (Wiley-VCH, 2004)