The following problem is considered: if H is a semiregular abelian subgroup of a transitive permutation group G acting on a finite set X, find conditions for (non)existence of G-invariant partitions of X and give their description in terms of orbits of H. Conditions and descriptions presented in this paper are derived by studying spectral properties of the associated G-invariant digraphs arisin...

Ordered sequences of univariate or multivariate regressions provide statistical models for analysing data from randomized, possibly sequential interventions, from cohort or multi-wave panel studies, but also from cross-sectional or retrospective studies. Conditional independences are captured by what we name regression graphs, provided the generated distribution shares some properties with a jo...

The topic of this paper is the study of Information Dissemination in Mobile Ad-hoc Networks by means of deterministic protocols. In this problem, a piece of information initially held by a source node has to be propagated to a given set of destination nodes. We consider multihop dynamic networks, in which n nodes move in the plane, join, and leave. Our connectivity model only requires that, wit...

In a series of five experiments, we investigated whether visual tracking mechanisms utilize prediction when recovering multiple reappearing objects. When all objects abruptly disappeared and reappeared mid-trajectory, it was found that (a) subjects tracked better when objects reappeared at their loci of disappearance than when they reappeared in their extrapolated trajectories, (b) disappearanc...

PURPOSE The purpose of this study was to evaluate microleakage around Class V resin restorations restored with glass-ceramic inserts luted with a high-viscous composite resin or a flowable composite resin. MATERIALS AND METHODS Twenty extracted human premolars (patient age range 12-18 yr) were randomly assigned to four groups. Class V preparations in two groups were filled using a glass-ceram...

Equistable graphs are graphs admitting positive weights on vertices such that a subset of vertices is a maximal stable set if and only if it is of total weight 1. In 1994, Mahadev et al. introduced a subclass of equistable graphs, called strongly equistable graphs, as graphs such that for every c ≤ 1 and every non-empty subset T of vertices that is not a maximal stable set, there exist positive...

We present a framework for the rational analysis of elemental causal induction—learning about the existence of a relationship between a single cause and effect—based upon causal graphical models. This framework makes precise the distinction between causal structure and causal strength: the difference between asking whether a causal relationship exists and asking how strong that causal relations...

syntactic principles. Cognition, 118, 306–338. http://dx.doi.org/ 10.1016/j.cognition.2010.11.001 Persaud, K., & Hemmer, P. (2014). The influence of knowledge and expectations for color on episodic memory. In P. Bello, M. Guarini, M. McShane, & B. Scassellati (Eds.), Proceedings of the Thirty-Sixth Annual Conference of the Cognitive Science Society (pp. 1162–1167). Austin, TX: Cognitive Science...