]> https://gitweb.dealii.org/ - dealii.git/commitdiff
docu of fourth order unit tensor: typo in index notation 13145/head
authorJohannes Friedlein <johannes.friedlein@fau.de>
Tue, 28 Dec 2021 18:28:49 +0000 (19:28 +0100)
committerJohannes Friedlein <johannes.friedlein@fau.de>
Wed, 29 Dec 2021 10:07:38 +0000 (11:07 +0100)
corrected minor typo in documentation of fourth order unit tensor (or "fourth order identity tensor") \mathcal{I}_{ijkl}, compare for instance Wriggers "Nonlinear Finite Element Methods" p.79 eq. (3.270) or [Notes on Continuum Mechanics - Tensors](http://mmc.rmee.upc.edu/documents/Tensor_Analysis/tensors.pdf) eq. (1.175); appears to be a copy-paste error from previous line 101

include/deal.II/base/symmetric_tensor.h

index 5e539e737048d16c01e34ac633a2c86905d4e77e..ceb538ef89cd1cd30d1fc782b3c73bdb26bdb291 100644 (file)
@@ -99,7 +99,7 @@ DEAL_II_CONSTEXPR inline DEAL_II_ALWAYS_INLINE SymmetricTensor<4, dim, Number>
  * In index notation, we can write the general form
  * \f[
  *   \mathcal{I}_{ijkl} = \frac 12 \left( \delta_{ik} \delta_{jl} +
- *                                        \delta_{il} \delta_{jl} \right).
+ *                                        \delta_{il} \delta_{jk} \right).
  * \f]
  * To see why this factor of $1 / 2$ is necessary, consider computing
  * $\mathbf A= \mathbb I : \mathbf B$.

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