Table[i*j, {i,0,4}, {j,0,4}] // MatrixForm // TeXForm

Table[i+j,{i,0,4},{j,0,4}]//MatrixForm//TeXForm

(({{1, 1}, {1, 2}})).(({{1, 0}, {0, 2}})).Inverse[(({{1, 1}, {1, 2}}))] // MatrixForm

MatrixForm /@ JordanDecomposition[(({{0, 1}, {-2, 3}}))]

(({{0, 1}, {-2, 3}})) // TeXForm

MatrixForm /@ JordanDecomposition[(({{1, 0}, {3, -2}}))]