000 00259nam a2200109Ia 4500
008 190719s9999 xx 000 0 und d
100 _aPaul R halmos
245 0 _aNa�ve theory
260 _aNew Delhi
_bEast & West Press
_c1972
650 _aMath
942 _cBK
999 _c3394
_d3394