http://reference.wolfram.com/mathematica/guide/MatrixOperations.html http://www.ma.iup.edu/projects/CalcDEMma/linalg0/linalg00.html http://documents.wolfram.com/v4/index174.html j3 = {{a,1,0},{0,a,1},{0,0,a}} MatrixForm[j3] MatrixForm[j3+j3] MatrixForm[j3.j3] Inverse[j3] MatrixPower[j3,4] Transpose[j3] Eigenvalues[j3] Eigenvectors[j3] LinearSolve[j3,{1,2}] <