* Positive and negative λ (λ < 0, λ > 0)
  Saddle. Unstable.

* Negative λ
  Nodal sink. Asymptotically stable.

* Positive λ
  Nodal source. Unstable.

* Complex number, positive real part
  Spiral source. Unstable.

* Complex number, negative real part
  Spiral sink. Asymptotically stable.

* Complex number, 0 real part
  Center. Stable.