The Essence of Concatenative LanguagesAndreas Rossberg defined a concise and elegant type system for the concatenative language Cat created by Christopher Diggins that makes clear, once and for all, that the nature of the paradigm is solidly functional, point-free and higher order in a way that, as John Nowak remarks, goes beyond the original conception of Backus' FP. Here I wish to contribute to fixing these important ideas by presen
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