A Look Back at Some Early Results in Membrane Computing

On this tenth anniversary of the Workshop on Membrane Computing, it seems appropriate and fitting to look back at some early basic contributions in the area. We give a brief summary of results, some of which answered fundamental open questions in the field. These concern complexity issues such as universality versus non-universality, determinism versus nondeterminism, various notions of parallelism, membrane and alphabet-size hierarchies, and characterizations of some classes of P systems.

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