The book Dag Representation And Optimization of Rewriting was written by author Ke Li Here you can read free online of Dag Representation And Optimization of Rewriting book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Dag Representation And Optimization of Rewriting a good or bad book?
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S remains a redex after rewriting of /.
n Theorem 1 In dag rewriting, for a lef. -linear and variable-more TBS. Given any term, any derivation for that term is oplimal.
Proof: Suppose D and D' are two derivations for term t and \D'\ < \D\. Suppose D[l. I] = D'[l. I] and D[i + l] # D'[, + l]. D[, + I] rewrites.^ and D'[i + l] rewrites . S'. By lemma 1. . *; remains a redex until it is rewritten in the subsequent derivation of D'. Suppose i! is rewritten in D' by rule r at step D'[j]{i < j). All function syml^ols 12 (and constants, if there are) in 5 matched with function symbols in the left side of r are called the critical part of, s. Note that those subterms in . S matched with variables of r are not in the critical ])arr.
Suppose j = i + A" [i- j defined above). Let /, +, be the term after step D'[i + p] in D' {0 < p < k — 1). Root-rewrite . <; in t, by rule r. T, Ijecoming /q. Consider applying D'[i + l]. D'[i + 2] D'[i + k - I] to t'^. Let t[, be the term after rewriting step D'[i +p](0 < p < k - 1).
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