00339nam a2200133Ia 45000030006000000080041000060400015000471000020000622450074000822500011001562600009001675460012001760050017001880STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aHalmos Paul, R.  aIntroduction to Hilbert Space and the theory of spectral multiplicity  aSecond  c1957  aEnglish20220125165954.0