We propose an implementation of linear finite element method for nonlocal diffusion problem in 2D space. In the implementation, we reduce the integral from 4D to 2D which would simplify the computation significantly.

翻译：本文提出了一种针对二维空间中非局部扩散问题的线性有限元方法实现方案。在该实现中，我们将积分从四维降至二维，从而显著简化了计算过程。