Read e-book online Advanced Topics in Term Rewriting PDF

By Enno Ohlebusch

ISBN-10: 1441929215

ISBN-13: 9781441929211

ISBN-10: 1475736614

ISBN-13: 9781475736618

Term rewriting ideas are acceptable in numerous fields of machine sci­ ence: in software program engineering (e.g., equationally unique summary info types), in programming languages (e.g., functional-logic programming), in machine algebra (e.g., symbolic computations, Grabner bases), in professional­ gram verification (e.g., instantly proving termination of programs), in automatic theorem proving (e.g., equational unification), and in algebra (e.g., Boolean algebra, staff theory). In different phrases, time period rewriting has purposes in functional machine technological know-how, theoretical machine technology, and arithmetic. approximately talking, time period rewriting recommendations can suc­ cessfully be utilized in components that call for effective equipment for reasoning with equations. one of many significant difficulties one encounters within the thought of time period rewriting is the characterization of periods of rewrite platforms that experience a fascinating estate like confluence or termination. If a time period rewriting method is conflu­ ent, then the conventional kind of a given time period is exclusive. A terminating rewrite method doesn't let limitless computations, that's, each computation ranging from a time period needs to lead to a standard shape. consequently, in a process that's either terminating and confluent each computation results in a outcome that's targeted, whatever the order during which the rewrite principles are utilized. This booklet presents a entire learn of termination and confluence in addition to similar properties.

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If- . rv a ---+i . '" . if- b b b (compatibility) (---+2 is CON",) (refinement) (---+1 is COM",) Hence ---+1 is CRrv. o It is not difficult to prove the following converse of the preceding corollary. Let Al = (A, ---+1, H) be a compatible refinement of A2 = (A, ---+2, H) modulo "'. If ---+1 is CON", and ---+2 is COMH, then ---+2 is CR",. 9. 12. 8]). However, if we replace LCOHH with the stronger property LCMUH, then SN is sufficient. This fact is made precise in the second statement shown by Jouannaud and Munoz [JM84].

9(iii) shows that LCOHH does not imply COHH. 9 deal with the relationship of LCMUH to the other properties in the coherence hierarchy. 9(iv) shows that LCMUH is not a consequence of SCOMH (and hence of neither of the other properties). 9(v) is LCMUH but not COHH. As a consequence, LCMUH does not imply any of the other properties apart from LCOHH. 5 For every ARB A the following holds: 1. COMH is equivalent to COMrv. 2. SCOMH =} COMH. Proof (1) By induction on k one shows that H . -+* <;;; -+* .

The phrase "defined function symbol" is justified by the existence of defining rules for that symbol. Throughout this book, we will use the operator I±J to denote the disjoint union of sets. For example, to emphasize that F is the disjoint union of D and C, we will often write F = D I±J C instead of F = D U C. 3 The TRS R consisting of the following five rules computes the Fibonacci numbers: O+y s(x)+y Jib(O) Jib( s(O)) Jib(s(s(x)) We have D -t -t -t -t -t y s(x + y) o s(O) Jib(s(x)) + Jib(x) = {+,Jib} and C = {O,s}.

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Advanced Topics in Term Rewriting by Enno Ohlebusch


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