a11,a12,a13,a21,a22,a23,a31,a32,a33 = sym.symbols('a_{11},a_{12}, a_{13},a_{21},a_{22},a_{23},a_{31},a_{32},a_{33}', negative=False) A = sym.Matrix([[a11,a12,a13],[a21,a22,a23],[a31,a32,a33]]) A b11,b...a11,a12,a13,a21,a22,a23,a31,a32,a33 = sym.symbols('a_{11},a_{12}, a_{13},a_{21},a_{22},a_{23},a_{31},a_{32},a_{33}', negative=False) A = sym.Matrix([[a11,a12,a13],[a21,a22,a23],[a31,a32,a33]]) A b11,b12,b13,b21,b22,b23,b31,b32,b33 = sym.symbols('b_{11},b_{12}, b_{13},b_{21},b_{22},b_{23},b_{31},b_{32},b_{33}', negative=False) B = sym.Matrix([[b11,b12,b13],[b21,b22,b23],[b31,b32,b33]]) B