Regular chain-code picture languages can be generated by collage grammars. As a consequence, all undecidability results known for regular chain-code languages can be adapted to picture languages generated by collage grammars.
CITATION STYLE
Dassow, J., Habel, A., & Taubenberger, S. (1996). Chain-code pictures and collages generated by hyperedge replacement. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 1073, pp. 412–427). Springer Verlag. https://doi.org/10.1007/3-540-61228-9_102
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