00679nam0-22002411i-450-990001177510403321000117751FED01000117751(Aleph)000117751FED0100011775120000920d1973----km-y0itay50------baengMathematics as an Educational Taskby FRE UDENTAL HANS.Dordrecht (NL)Reidel1973Freudenthal,Hans<1905-1990>12433ITUNINARICAUNIMARCBK990001177510403321107-E-2214017MA1MA1Mathematics as an Educational Task341989UNINAING01