O16-962
> restart:
> with(linalg):
Warning, new definition for norm
Warning, new definition for trace
> a:=matrix(3,3,[59,-26,10,188,-83,32,140,-62,24]);

                            [ 59    -26    10]
                            [                ]
                       a := [188    -83    32]
                            [                ]
                            [140    -62    24]

> eigenvects(a);

  [-1, 1, {[1, 10/3, 8/3]}], [0, 1, {[1, 4, 9/2]}],

        [1, 1, {[1, 3, 2]}]

> eigenvects(transpose(a));# 4x-2y+z=0, 26x-11y+4z=0, 11x-5y+2z=0 sont les plans stables

  [0, 1, {[4, -2, 1]}], [1, 1, {[13/2, -11/4, 1]}],

        [-1, 1, {[11/2, -5/2, 1]}]

> solve({4*x-2*y+z=0, 26*x-11*y+4*z=0},{y,z});# L'intersection des 2 premiers plans stables est bien une droite stable

                       {y = 10/3 x, z = 8/3 x}

>