Advances in Mathematical Physics / 2015 / Article / Fig 1

Research Article

Existence of Center for Planar Differential Systems with Impulsive Perturbations

Figure 1

The center and focus of system (48a) and (48b). (a) The center, where . (b) An unstable focus, where . (c) A stable focus, where .
(a)
(b)
(c)

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