Example Computation
The image shown depicts the initial state of a P system with three membranes. Because of their hierarchical nature, P systems are often depicted graphically with drawings that resemble Venn diagrams or David Harel's Higraph (see Statechart).
The outermost membrane, 1, is the container membrane for this P system and contains a single out rule. Membrane 2 contains four here rules, with two in a priority relationship: cc → c will always be applied in preference to c → δ. The delta symbol represents the special “dissolve” symbol. The innermost membrane, 3, contains a set of symbols (“ac”) and three rules, of type here. In this initial state no rules outside of membrane 3 are applicable: there are no symbols outside of that membrane. However, during evolution of the system, as objects are passed between membranes, the rules in other membranes will become active.
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