@article {,
	title = {Membrane Computing and Economics: Numerical P Systems},
	journal = {Fundamenta Informaticae},
	volume = {73},
	year = {2006},
	pages = {213-227},
	publisher = {IOS Press},
	address = {Warsaw, Poland},
	abstract = {With inspiration from the economic reality, where numbers are basic entities to work with, we propose a genuinely new kind of P systems, where numerical variables evolve, starting from initial values, by means of production functions and repartition protocols. We prove that non-deterministic systems of this type, using polynomial production functions, characterize the Turing computable sets of natural numbers, while deterministic systems, with polynomial production functions having non-negative coefficients, compute strictly more than semilinear sets of natural numbers. A series of research topics to be addressed in this framework are mentioned.

},
	keywords = {economics, Membrane computing, Turing computability, Universality},
	issn = {0169-2968 },
	url = {http://portal.acm.org/citation.cfm?id=1231159.1231179\&coll=GUIDE\&dl=GUIDE\&CFID=1691426\&CFTOKEN=24108515},
	author = {Gheorghe Paun and Radu  Paun}
}
