I'm new with FEniCS and Python and I'm stuck with this issue:is there a way to write a 4th order tensor in an easy way to implement?I have to compute the following stiffnes tensor:$A_{ijkl}= \lambda \delta_{ij}\delta_{kl} + \mu (\delta_{ik}\delta_{jl} + \delta_{il}\delta_{jk})$
4th order tensor
pde;python;fenics;tensor