00289nam a2200133Ia 45000030006000000080041000060400015000471000023000622450021000852500011001062600009001175460012001260050017001380STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aHausdorff Felix Ed  aNaive set theory  aSecond  c1962  aEnglish20220125165920.0