00279nam a2200097Ia 4500008004100000082001700041100001900058245007200077260002300149300000900172210430s9999    xx            000 0 und d  a515.7K9211 I  aErwin Kreyszig  aIntroductiory Functional Analysis With ApplicationscErwin Kreyszig  aIndiabWileyc1989  a688p