A language is recursively enumerable if its strings are [[computably enumerable set]]. In other words, there is a [[Turing machine]] that accepts words from the language and rejects or halts on the ...

In automata-golf, a machine is defined by a series of path statements. There's no need to explicitly define states or transitions.

Abstract: We improve, by using register machines, some existing universality results for specific models of P systems. P systems with membrane creation are known to generate all recursively enumerable ...