- for BiCGstabl the minimal degree is 2, but 3 is recommended - when adding the equation, it should do something, therefore enable the calculation of the principal stresses (as it was, nothing was calculated except of the displacement)
- for BiCGstabl the minimal degree is 2, but 3 is recommended - when adding the equation, it should do something, therefore enable the calculation of the principal stresses (as it was, nothing was calculated except of the displacement)