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Let `$E_i$` be the n¡Án matrix with a 1 on position (i,i) and zeros everywhere else; similarly, let `$e_i$` be the 1¡Án row matrix with a 1 on position (1,i) and zeros everywhere else. Then

```math
diag(V) = \sum_{i=1}^{n} E_i v e_i
```
11Â¥2020-07-12 16:16:33
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