##### Lecture on Trace
Content covered:

Trace of a matrix is the sum of its principal diagonal elements.

Example:$\begin{bmatrix}2&7&9\\3&4&6\\5&6&-5\end{bmatrix}$ trace = 2 + 4 + -5 =1

Necessary condition for trace calculation is matrix should be a square matrix.

Properties of trace are:

1. tr(λA) = λ*tr(A)
2. tr(A+B) = tr(A) +tr(B)
3. tr(AB) = tr(BA)
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