Trace
Linear algebra
>
&tbnh=97&tbnw=129&usg=AI4_-kSX5tiahif0pVUon8FbDG67gg_ngw&vet=1&docid=q1TcsjQUFlhUqM&sa=X&ved=2ahUKEwjUxtem_diFAxUel4kEHcI_A90Q9QF6BAgAEAY)
&tbnh=84&tbnw=150&usg=AI4_-kRsA5R2lj9h_67DpwbszpaxaAMpuw&vet=1&docid=WtyBQj0CjpppBM&sa=X&ved=2ahUKEwjUxtem_diFAxUel4kEHcI_A90Q9QF6BAgAEAg)
&tbnh=106&tbnw=142&usg=AI4_-kT9HQAhX9R_a7AFLJ5N_nX9yLXsuw&vet=1&docid=JZxlLEmOOAcwOM&sa=X&ved=2ahUKEwjUxtem_diFAxUel4kEHcI_A90Q9QF6BAgAEAo)
In linear algebra, the trace of a square matrix A, denoted tr, is defined to be the sum of elements on the main diagonal of A. The trace is only defined for a square matrix.
It can be proven that the trace of a matrix is the sum of its... Wikipedia