00290nam a2200121Ia 450000500170000000800410001704100080005808200130006610000160007924500450009526000190014030000090015920260720174727.0260720s1988    xx            000 0 und d  aeng  a510 FREI  aFreeman W H  aIntroduction to contemporary mathematics  aNew Yorkc1988  a450p