看清运费、商品描述、请直接下单,单本不议价,量大从优。标“现货”的当日16点前北京发货,其余的国外发货,一般2-3周周可到货,个别的4-5周,急用的请咨询客服。代购各国外文图书,发票税点3%(下单后联系客服,把税点钱加到订单里面再付款)。孔网买书一定要看清封底和版权页,看好卖家信誉、发货时效。 This volume is based on PDE courses given by the authors at the Courant Institute and at the University of Notre Dame, Indiana. Presented are basic methods for obtaining various a priori estimates for second-order equations of elliptic type with particular emphasis on maximal principles, Harnack inequalities, and their applications. The equations considered in the book are linear; however, the presented methods also apply to nonlinear problems. This second edition has been thoroughly revised and in a new chapter the authors discuss several methods for proving the existence of solutions of primarily the Dirichlet problem for various types of elliptic equations.
以下为对购买帮助不大的评价