Download Answer Set Programming for Continuous Domains: A Fuzzy Logic by Jeroen Janssen, Steven Schockaert, Dirk Vermeir, Martine De PDF

By Jeroen Janssen, Steven Schockaert, Dirk Vermeir, Martine De Cock

Resolution set programming (ASP) is a declarative language adapted in the direction of fixing combinatorial optimization difficulties. it's been effectively utilized to e.g. making plans difficulties, configuration and verification of software program, analysis and database maintenance. even if, ASP isn't really at once appropriate for modeling issues of non-stop domain names. Such difficulties ensue certainly in various fields resembling the layout of gasoline and electrical energy networks, computing device imaginative and prescient and funding portfolios. to beat this challenge we research FASP, a mixture of ASP with fuzzy common sense -- a category of manyvalued logics that may deal with continuity. We in particular specialise in the next concerns: 1. a massive query while modeling non-stop optimization difficulties is how we should always deal with overconstrained difficulties, i.e. difficulties that experience no suggestions. in lots of circumstances we will favor to settle for a less than perfect answer, i.e. an answer that doesn't fulfill all of the acknowledged principles (constraints). notwithstanding, this ends up in the query: what imperfect recommendations should still we elect? We examine this query and enhance upon the state of the art via offering an strategy in accordance with aggregation capabilities. 2. clients of a programming language frequently need a wealthy language that's effortless to version in. even if, implementers and theoreticians favor a small language that's effortless to enforce and cause approximately. We create a bridge among those wishes through providing a small center language for FASP and via exhibiting that this language is in a position to expressing a lot of its universal extensions similar to constraints, monotonically lowering features, aggregators, S-implicators and classical negation. three. a well known procedure for fixing ASP includes translating a software P to a propositional conception whose versions precisely correspond to the reply units of P. We exhibit how this method could be generalized to FASP, paving how you can enforce effective fuzzy resolution set solvers which can benefit from latest fuzzy reasoners.

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Example text

Bn ; c1 , . . , cm ) is called the body of the rule, denoted rb . In the remainder of this book we implicitly assume all lattices to be complete. 1) using r : a ← α. The Herbrand base of a rule r, denoted Br , is defined as the set of atoms occurring in r. Similar to ASP, FASP rules can be divided in certain classes, depending on the conditions satisfied by their head and body. (1) A rule r : a ← f (b1 , . . , bn ; c1 , . . , cm ) on a lattice L is called a constraint if a ∈ L . (2) A rule r : a ← f (b1 , .

Hence M is a model of M(α). PA . This contradicts the assumption that A is an answer set of P, from which the stated follows. The reverse does not hold, as shown in the following example. 9. 4 }. 9 . First, it is clear that rule r1 is trivially satisfied by I. Second, consider rule r2 . To satisfy this rule we need to have that I(p) of NW and TW this means I(p) TW (NW (I(p)), NW (I(a))). By definition max(1 − I(p) + 1 − I(a) − 1, 0), which does indeed hold. 9 . Now suppose there is some model I such that I ⊂ I.

2000)]. The latter defines completeness with respect to a more general semantics for BL, called BL-algebras. e. a tautology for each BL-algebra [H´ajek (1998)]. 3: Propositional logics for the common continuous t-norms on ([0, 1], ) (from [H´ajek (1998)]) that the logic BL captures all properties that are common to the continuous t-norms on ([0, 1], ). If we now consider specific t-norms, it is also possible to construct a logic that exactly captures the 1-tautologies for this specific t-norm. Note that these logics can be characterized by extending BL with certain axioms.

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