Classical tissue P systems with cell division have a special alphabet whose
elements appear at the initial configuration of the system in an arbitrary large number
of copies. These objects are shared in a distinguished place of the system, called the environment.
Besides, the ability of these computing devices to have infinite copies of some
objects has been widely exploited in the design of efficient solutions to computationally
hard problems.
This paper deals with computational aspects of tissue P systems with cell division
where there is not an environment having the property mentioned above. Specifically,
we establish the relationships between the polynomial complexity class associated with
tissue P systems with cell division and with or without environment. As a consequence,
we prove that it is not necessary to have infinite copies of some objects at the initial
configuration in order to solve NP–complete problems in an efficient way.Ministerio de Ciencia e Innovación TIN2009-13192Junta de Andalucía P08 – TIC 0420
