Geometric Numerical Integration: Structure-Preserving Algorithms for Ordinary Differential Equations (Springer Series in Computational Mathematics) [ペーパーバック] Hairer, Ernst Lubich, Christian; Wanner, G #難関オリジナル #都立オリジナル Perturbation Theory for Linear Operators (Classics in Mathematics, 132) [ペーパーバック] Kato, Tosio