2023-04-112023-04-112022-10-19Orellana Martín, D., Valencia Cabrera, L., Song, B., Pan, L. y Pérez Jiménez, M.d.J. (2022). Tissue P systems with evolutional communication rules with two objects in the left-hand side. Natural Computing, 22, 119-132. https://doi.org/10.1007/s11047-022-09924-z.1567-7818 (impreso)1572-9796 (online)https://hdl.handle.net/11441/144124In the framework of Membrane Computing, several efficient solutions to computationally hard problems have been given. To find new borderlines between families of P systems that can solve them and the ones that cannot is an important task to tackle the P versus NP problem. Adding syntactic and/or semantic ingredients can mean passing from non-efficiency to presumed efficiency. Here, we try to get narrow frontiers, setting the stage to adapt efficient solutions from a family of P systems to another one. In order to do that, a solution to the SAT problem is given by means of a family of tissue P systems with evolutional symport/antiport rules and cell separation with the restriction that both the left-hand side and the righthand side of the rules have at most two objects; that is, with recognizer P systems from TSECð2; 2Þ. This result improves a previous one, when 3 objects could be used in the left-hand side of the evolutional communication rulesapplication/pdf14engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Membrane computingSymport/antiport rulesThe P versus NP problemSAT probleminfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess10.1007/s11047-022-09924-z