The Trace of a 2x2 Matrix calculator compute the Trace of a 2x2 matrix.
INSTRUCTIONS: Enter the following:
TRACE: The calculator returns the trace of the 2x2 matrix.
The trace of an nxn matrix A is the sum of the diagonal entries `A_11, A_22,...,A_(n n)`. So `"tr"(A)=sum A_(ii)`.
For the 2x2 matrix
`A = [[A_11 , A_12], [A_21 , A_22]]`,
the trace is given by `A_11 +A_22`.
The trace of a matrix is useful in determining the eigenvalues (`λ_i`) of the matrix. For any matrix, `sum λ_i= sum A_(ii) ="tr"(A)`.