![微积分及其应用 （原书第8版） [美]比廷杰 杨奇、 【正版保证】](http://img3m3.ddimg.cn/6/10/11758461963-1_l.jpg)
实用逻辑是形式逻辑的深化和发展。它一方面要系统地阐明形式逻辑的基本原理，另一方面要侧重阐明如何把这些基本原理运用到实际工作和生活当中去。本书坚持理论性，突出实用性，强化趣味性，兼顾普及性。全书体系完整，简明扼要，深入浅出，趣味盎然，适合高等院校各文种专业教学及各级党校、干部培训之用。
This revision of the 1983 second edition of"Elliptic Partial Differential Equations of Second Order" corresponds to the Russian edition, published in 1989, in which we essentially updated the previous version to 1984. The additional text relates to the boundary H61der derivative estimates of Nikolai Krylov, which provided a fundamental ponent of the further development of the classical theory of elliptic (and parabolic), fully nonlinear equations in higher dimensions. In our presentation we adapted a simplification of Krylov's approach due to Luis Caffarelli.
