00429nam a2200169Ia 450000500170000000800410001702000120005808200150007010000230008524500530010825000120016126000310017330000080020450500220021294200080023499900170024220241209164220.0241209s9999 xx 000 0 und d afca3100 a517.52/L68 aLipechutz, Seymuor 0aTheory and problems set theory and related topic a1a. ed. aNew YorkbEd. Schaumc1964 a231 aTexto en ingleĢs yLIB c19728d19728