【数学专业英语文选】下集 - 印书馆北京.pdf
数学专业英语文选 下册 南京大学外文系公共英语教研室编 商务印书馆 1979年北京
CONTENTS 31parative Rate of Functions and Inde-pendent Variables.Derivatives.Newtons Integrals and RiemannsIntegrals 34.Differential Equation.35.The Orthogonal Trajectories36.Variations(I)37.Variations(Ⅱ)38.Variations(Ⅲ)39.
31PARATIVERATEOF FUNCTIONSANDINDEPEND- ENTVARIABLES Itis theprimaryobjectoftheDifferentialCalculus toobtainameasureoftherateofincreaseofthefunc- tionascomparedwith thatoftheindependentvariable.①For this purpose,we let.x denote an increment in the value ofx,so thatx andx+.xaretwovaluesof the in 