Editing Voigt notation (section)

== Mnemonic rule ==
A simple [[Mnemonic|mnemonic rule]] for memorizing Voigt notation is as follows:

* Write down the second order tensor in matrix form (in the example, the stress tensor)
* Strike out the diagonal
* Continue on the third column
* Go back to the first element along the first row.

Voigt indexes are numbered consecutively from the starting point to the end (in the example, the numbers in blue).

[[File:Voigt notation Mnemonic rule.svg|180px]]

The diagram below also shows the order of the indices:
<math display="block"> 
\begin{matrix}
ij & =\\
\Downarrow & \\
\alpha  & =
\end{matrix}

 \begin{matrix}
11 & 22 & 33 & 23,32 & 13,31 & 12,21 \\
\Downarrow & \Downarrow & \Downarrow & \Downarrow & \Downarrow & \Downarrow & \\
1  &2 &  3 &  4 &  5 & 6
\end{matrix}</math>