Abstract
We introduce a class of two-dimensional tiling languages which are distinct from the local and recognizable picture languages. These languages arise from tilings of the integer lattice Z 2. For such picture languages, we define a class of tissue-like P systems with active membranes as a generative device. We also make a comparison with the model introduced in [2,3] for the generation of local and recognizable two-dimensional languages, using a similar type of P systems.
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