%0 Generic %D 2006 %T Small Universal Spiking Neural P Systems %A Gheorghe Paun %A Andrei Paun %C San Diego, CA, USA %I Elsevier %P 49-60 %U http://www.gcn.us.es/4BWMC/vol2/smalluniv.pdf %V 90 %X In search for small universal computing devices of various types, we consider here the case of spiking neural P systems (SN P systems), in two variants: as devices that compute functions and as devices that generate sets of numbers. We start with the first case and we produce a universal spiking neural P system with 84 neurons. If a slight generalization of the used rules is adopted, namely, we allow rules for producing simultaneously several spikes, then a considerable reduction, to 49 neurons, is obtained. For SN P systems used as generators of sets of numbers, we find a universal system with restricted rules having 76 neurons and one with extended rules having 50 neurons. %> http://cantor.cs.us.es/files/small universal.pdf