Fig. 7

Phase diagrams for planar system in Eq. (6.1): (a) illustrate the phase portrait for Case 1; (b) illustrate the phase portrait for Case 2; (c) illustrate the phase portrait for Case 3; (d) illustrate the phase portrait for Case 4.

Phase diagrams for planar system in Eq. (6.1): (a) illustrate the phase portrait for Case 1; (b) illustrate the phase portrait for Case 2; (c) illustrate the phase portrait for Case 3; (d) illustrate the phase portrait for Case 4.