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A prefix grammar is a context-free grammar whose nonterminals generate prefix-free languages. A prefix grammar $G$ is an ordinal… Expand The paper studies the subsequence relation through a notion of an intransitive binary relation on words in traces generated by… Expand We prove that there exists no algorithm to decide whether the language generated by a context-free grammar is dense with respect… Expand We present an analysis of how the genotype-phenotype map in Grammatical Evolution (GE) can effect performance on the Max Problem… Expand We consider context-free languages equipped with the lexicographic ordering. We show that when the lexicographic ordering of a… Expand We prove that there exists no algorithm to decide whether the language generated by a context-free grammar is dense with respect… Expand A powerful method of parsing is presented, that suits particularly well the Graham-Glanville code generation methodology. This… Expand