00336nam a2200121 a 450000500170000002000150001708200150003210000160004724500410006326000430010430000230014749000440017020251203110612.0  a8185931143  a515.7bSUN  aSunder, V.S  aFunctional analysisbspectral theory  aNew DelhibHindustan book agencyc1997  ax,306p.c22cm.cHB  aTexts and readings in Mathematics No.13