00438nam a22001697a 450000500170000002000180001710000160003524500330005125000130008426000290009730000120012649000340013850000390017265000260021165000180023765000130025520260113103505.0  a9780387940014  aLang, Serge  aReal and functional analysis  a3rd ed.   aNew YorkbSpringerc1993  axiv+580  aGraduate texts in mathematics  aGraduate texts in mathematics -142  aMathematical analysis  aHilbert space  aCalculus