Lecture on Trace
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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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