1,642 research outputs found
Defeasible Reasoning in SROEL: from Rational Entailment to Rational Closure
In this work we study a rational extension of the low complexity
description logic SROEL, which underlies the OWL EL ontology language. The
extension involves a typicality operator T, whose semantics is based on Lehmann
and Magidor's ranked models and allows for the definition of defeasible
inclusions. We consider both rational entailment and minimal entailment. We
show that deciding instance checking under minimal entailment is in general
-hard, while, under rational entailment, instance checking can be
computed in polynomial time. We develop a Datalog calculus for instance
checking under rational entailment and exploit it, with stratified negation,
for computing the rational closure of simple KBs in polynomial time.Comment: Accepted for publication on Fundamenta Informatica
Characterized subgroups of topological abelian groups
A subgroup of a topological abelian group is said to be characterized
by a sequence of characters of if . We study the basic properties of characterized
subgroups in the general setting, extending results known in the compact case.
For a better description, we isolate various types of characterized subgroups.
Moreover, we introduce the relevant class of autochacaracterized groups
(namely, the groups that are characterized subgroups of themselves by means of
a sequence of non-null characters); in the case of locally compact abelian
groups, these are proved to be exactly the non-compact ones. As a by-product of
our results, we find a complete description of the characterized subgroups of
discrete abelian groups.Comment: 22 page
Inflated pyroclasts in proximal fallout deposits reveal abrupt transitions in eruption behaviour
Dendritic crystallization in hydrous basaltic magmas controls magma mobility within the Earth's crust
Soil Erosion Land Degradation and Desertification in the European Mediterranean Region : Assessment and Preventive Measures
Novel perspectives in redox biology and pathophysiology of failing myocytes: modulation of the intramyocardial redox milieu for therapeutic interventions - A review article from the Working Group of Cardiac Cell Biology, Italian Society of Cardiology
The prevalence of heart failure (HF) is still increasing worldwide, with enormous human, social, and economic costs, in spite of
huge efforts in understanding pathogeneticmechanisms and in developing effective therapies that have transformed this syndrome
into a chronic disease. Myocardial redox imbalance is a hallmark of this syndrome, since excessive reactive oxygen and nitrogen
species can behave as signaling molecules in the pathogenesis of hypertrophy and heart failure, leading to dysregulation of cellular
calcium handling, of the contractile machinery, of myocardial energetics and metabolism, and of extracellular matrix deposition.
Recently, following new interesting advances in understanding myocardial ROS and RNS signaling pathways, new promising
therapeutical approaches with antioxidant properties are being developed, keeping in mind that scavenging ROS and RNS tout
court is detrimental as well, since these molecules also play a role in physiological myocardial homeostasis
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