Errors of verbal complementation are among the most frequent and intractable types of grammatical error produced by ESL learners of all levels. Formal rules help only to a very slight degree, and most of the time one operates on intuition. One avoids constructions such as *Mary avoids to make mistakes. simply on the basis of feel—it sounds and looks odd. Many learners seem to operate on the ‘ec...

We consider complementing Büchi automata by applying the Ramsey-based approach, which is the original approach already used by Büchi and later improved by Sistla et al. We present several heuristics to reduce the state space of the resulting complement automaton and provide experimental data that shows that our improved construction can compete (in terms of finished complementation tasks) also ...

In this paper we investigate some matrix structures on C that have a good behaviour under Schur complementation. The first type of structure is closely related to low displacement rank matrices. Next, we show that for a matrix having a low rank submatrix, also the Schur complement must have a low rank submatrix, which we can explicitly determine. This property holds even if the low rank submatr...

In wild-type Drosophila embryos, five lateral chordotonal (lch) axons in each abdominal hemisegment originate from a midlaterally positioned cluster of neurons and grow, fasciculate, and orient ventrally as they connect with targets in the CNS. We have identified 22 recessive lethal mutations in 12 complementation groups, 8 of which are novel, that differentially affect lch axon growth, fascicu...

We deene the notion of weak relative pseudo-complement, and we show that, for an arbitrary lattice, the property of weak relative pseudo-complementation is strictly weaker than relative pseudo-complementation, but stronger than pseudo-complementation. Our main interest for this notion is in relation with the theory of closure operators. We prove that if a complete lattice L is completely inf-di...

We study inference systems for the combined class of functional and full hierarchical dependencies in relational databases. Two notions of implication are considered: the original version in which the underlying set of attributes is fixed, and the alternative notion in which this set is left undetermined. The first main result establishes a finite axiomatisation in fixed universes which clarifi...

Chromosome region 85A contains at least 12 genetic complementation groups, including the genes dhod, pink and hunchback. In order to better understand the organization of this chromosomal segment and to permit molecular studies of these genes, we have carried out a genetic analysis coupled with a chromosome walk to isolate the DNA containing these genes. Complementation tests with chromosomal d...

Reasoning about the evolution of our species' capacity for cumulative cultural learning has led culture–gene coevolutionary (CGC) theorists to predict that humans should possess several learning biases which robustly enhance the fitness of cultural learners. Meanwhile, developmental psychologists have begun using experimental procedures to probe the learning biases that young children actually ...