00000nam a2200000 a 4500 20251202164313.0 512.5 LAT Tosio Kato Short introduction to perturbatton theory for linear operations London Springer Verlag 1982 xiii,161 p. 24 cm Mathemetics:LinearOperations _ 6937 LIBSC C 6863 6863 0 0 0 0 PU PU 2000-02-24 0 512.5 LAT 6937 BK