00311nam a2200109Ia 4500008004100000040003800041100001400079245002600093260004900119300001600168653001700184211214s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aRitt, J F 0aDifferential algebra.  bAmercan Mathematical SocietyaNew Yorkc1950  aviii,184 p.  aMathematics,