28 research outputs found
Simplification of many-valued logic formulas using anti-links
We present the theoretical foundations of the many-valued
generalization of a technique for simplifying large non-clausal
formulas in propositional logic, that is called "removal of
anti-links". Possible applications of anti-links include computation
of prime implicates of large non-clausal formulas as required, for
example, in diagnosis. Anti-links do not compute any normal form of a
given formula themselves, rather, they remove certain forms of
redundancy from formulas in negation normal form (NNF). Their main
advantage is that no clausal normal form has to be computed in order
to remove redundant parts of a formula. In this paper, we define an
anti-link operation on a generic language for expressing many-valued
logic formulas called "signed NNF" and we show that all interesting
properties of two-valued anti-links generalize to the many-valued
setting, although in a non-trivial way
On Binary Max-Sum and Tractable HOPs
The Max-Sum message-passing algorithm has been used to approximately solve several unconstrained optimization problems, specially in the distributed context. In general, the complexity of computing messages is exponential. However, if the problem is modeled using the so called Tractable HOPs (THOPs), binary MaxSum's messages can be computed in polynomial time. In this paper we review existing THOPs, and present new ones, aiming at providing an updated view of efficient message computation.Peer Reviewe
Optimisation d'algorithmes d'inference monotone en logique des propositions et du premier ordre
SIGLECNRS T 66465 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc