We continue the investigation on the spectrum of operators arising from the discretization of partial differential equations. In this paper we consider a three field formulation recently introduced for the finite element least-squares approximation of linear elasticity. We discuss in particular the distribution of the discrete eigenvalues in the complex plane and how they approximate the positive real eigenvalues of the continuous problem. The dependence of the spectrum on the Lam\'e parameters is considered as well and its behavior when approaching the incompressible limit.

翻译：我们继续调查部分差异方程式离散产生的操作员范围。 在本文中,我们考虑最近为线性弹性最小方位的有限元素近似而引入的三种野外配方。我们特别讨论了复杂平面中离散电子元值的分布,以及它们如何接近持续问题的实际正值。频谱对Lam'e参数的依赖性以及接近不可压缩极限时的行为。