# 4th order tensor [closed]

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:

$A_{ijkl}= \lambda \delta_{ij}\delta_{kl} + \mu (\delta_{ik}\delta_{jl} + \delta_{il}\delta_{jk})$

## closed as off-topic by Bill Barth, Geoff OxberryOct 31 '14 at 22:54

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• You should really ask this over on the FEniCS forums. – Bill Barth Oct 31 '14 at 19:05