简介：
What it is: A C++ software library supporting the creation of finite element codes and an open community of users and developers. (Learn more.)
Mission: To provide well-documented tools to build finite element codes for a broad variety of PDEs, from laptops to supercomputers.
Vision: To create an open, inclusive, participatory community providing users and developers with a state-of-the-art, comprehensive software library that constitutes the go-to solution for all finite element problems.
>>求解偏微分方程开源有限元软件deal.II学习--Step 48：https://blog.csdn.net/zyex1108/article/details/54666541
>>deal ii安装教程：https://blog.csdn.net/u012161192/article/details/124358065
>>dealii/deal.ii 有限元编程 FEM/FEA 学习：https://zhuanlan.zhihu.com/p/62713229
>>deal ii在Windows上的安装可以吗？怎么下载依赖库？:https://github.com/dealii/dealii/wiki/Windows
>>libMesh是什么？：https://www.qixinbo.info/2017/06/18/libmesh-introduction-learn/
