A density anomaly, i.e. a temperature region with negative thermal expansion (NTE) bounded by maximum and minimum at lower temperatures, is revealed characterised in tantala for the first time Molecular Dynamics simulations. The NTE evidenced metastable supercooled liquid rather close to glass transition. Since suppressed poor structural equilibration, highlighting these phenomena highly challe...

Why can't we say the asleep cat? There is a class of adjectives in English, all of which start with a schwa (e.g. afraid, alone, asleep, away, etc.), that cannot be used attributively in a prenominal position. A frequently invoked strategy for the acquisition of such negative constraints in language is to use indirect negative evidence. For instance, if the learner consistently observes paraphr...

Indirect negative evidence is clearly an important way for learners to constrain overgeneralisation, and yet a good learning theoretic analysis has yet to be provided for this, whether in a PAC or a probabilistic identification in the limit framework. In this paper we suggest a theoretical analysis of indirect negative evidence that allows the presence of ungrammatical strings in the input and ...