Linear Algebra and the C Language/a0fx
The trace function:
The trace of a square matrix A, denoted tr(A), is the sum of the elements on its main diagonal... Wikipedia: Trace
trace_R(A+B) = trace_R(A) + trace_R(B)
trace_R(AB) = trace_R(BA)
trace(sA) = s*trace(A)
trace(A) = trace(A_t)
trace_R(A) = trace_R(Eigenvalues)
The traces of similar matrices are equal