$$\mathbf{\sigma} = \begin{Bmatrix} \sigma_x \\\\ \sigma_y \\\\ \sigma_z \\\\ \tau_{xy} \\\\ \tau_{xz} \\\\ \tau_{yz} \end{Bmatrix} = \begin{Bmatrix} \lambda \\\\ 0 \\\\ 0 \\\\ 0 \\\\ 0 \\\\ 0 \end{Bmatrix}$$

$$\mathbf{\epsilon} = \begin{Bmatrix} \epsilon_x \\\\ \epsilon_y \\\\ \epsilon_z \\\\ \gamma_{xy} \\\\ \gamma_{xz} \\\\ \gamma_{yz} \end{Bmatrix} = \begin{Bmatrix} \frac{\lambda}{E} \\\\ -\frac{\nu \, \lambda}{E} \\\\ -\frac{\nu \, \lambda}{E} \\\\ 0 \\\\ 0 \\\\ 0 \end{Bmatrix}$$