An Introduction to Ordinary Differential Equations (James C. Robinson)

经典微分方程的教材，适合初学者 Part I First order differential equations Part II Second order linear equations with constant coefficients Part III Linear second order equations with variable coefficients Part IV Numerical methods and difference equations Part V Coupled linear equations Part VI Coupled nonlinear equations

Walter Rudin，Principles of Mathematical Analysis, 3rd Edition

第三版的刊误和更正，英文PDF，如： P.4, line 4: Change this line to ‘‘(ii) If γ ∈S is an upper bound of E, then γ ≥ α’’ for greater clarity P.4 3rd line of Definition 1.10: A clearer statement would be, ‘‘Every subset E ⊂ S which is nonempty and bounded above has a supremum sup E in S.’’