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8 changes: 1 addition & 7 deletions Project#01/hints/hint7-1.md
Original file line number Diff line number Diff line change
Expand Up @@ -3,13 +3,7 @@ Here are two approaches for the [diagonalization](http://en.wikipedia.org/wiki/D
## Secular Determinant
Since the moment of inertia tensor is only a 3x3 matrix, a brute-force approach via the secular determinant is feasible:

```latex
\left|\begin{array}{ccc}
(I_{11}-\lambda) & I_{12} & I_{13} \\
I_{21} & (I_{22}-\lambda) & I_{23} \\
I_{31} & I_{32} & (I_{33}-\lambda) \\
\end{array}\right| = 0
```
<img src="../figures/determinant.png" height="60">

This leads to a cubic equation in &lambda;, which one can solve directly. Have fun with that.

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