X-Nico

P system

Some P system variants allow for a membrane to divide, possess a charge or have varying permeability by changing membrane thickness.

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Because of their hierarchical nature, P systems are often depicted graphically with drawings that resemble Venn diagrams or David Harel's Higraph (see Statechart).

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As implied to by their namesake, membranes are permeable and symbols resulting from a rule may cross them.

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The in modifier causes the object to be passed to one of the current membrane’s children (travelling inwards relative to the structure of the P system), chosen at random during the computation.

see also