00345nam a2200109Ia 4500008004100000082001500041100001600056245004100072260004800113630001800161650005600179211122s9999||||xx |||||||||||||| ||und||  a510bARN-M  aArnold, V I 0aMathematical Understanding Of Nature  bAmerican Mathematical SocietyaRhode Island  xGeneral Stack  aMathematicsvNATURAL SCIENCES AND MATHEMATICSNATURE