Theoretically the numerical solution of Poisson's equation or Laplace's equation plus Neumann boundary condition calculated by the boundary integration method is not unique.
使用边界积分方法求解已知第二类边界条件的拉普拉斯方程或泊松方程时，理论上解是不唯一的。
At present, the common numerical methods are finite difference, finite element, boundary element, integration equation and transmission line method.
目前，解决这类问题的数值方法主要有有限差分法、有限元法、边界元法、积分方程法、传输线法等。
The singular integration will affect the precision of the result while the Boundary Element Method (BEM) is used in calculating sound radiation.
边界元法应用于计算辐射声场时，由于奇异积分的存在，会影响到计算结果的精度。
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