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MATRICES
A rectangular array of symbols (which could be real or complex numbers) along rows and columns is called a matrix.
Equal Matrices:
Two matrices are said to be equal if they have the same order and each element of one is equal to the corresponding element of the other.
Trace of a Matrix:
The sum of the elements of a square matrix A lying along the principal diagonal is called the trace of A i.e. tr(A)
Thus if A = [aij]n´n
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