In 2018 Celikbas, Laxmi, Kraśkiewicz, and Weyman exhibited an interesting family of perfect ideals codimension three, with five generators, Cohen-Macaulay type two trivial multiplication on the Tor algebra. All previously known had been found by Brown in 1987. Brown's all have non-trivial We prove that are obtained from (non-homogeneous) specialization. also both families ideals, when built usi...

When implementing a propagator for a constraint, one must decide about variants: When implementing min, should one also implement max? Should one implement linear equations both with and without coefficients? Constraint variants are ubiquitous: implementing them requires considerable (if not prohibitive) effort and decreases maintainability, but will deliver better performance. This paper shows...

We present a framework for decision making with the possibility to express circumstance-dependent preferences among different alternatives for a decision. This new formalism, Ordered Choice Logic Programs (OCLP), builds upon choice logic programs to define a preference/specialization relation on sets of choice rules. We show that our paradigm is an intuitive extension of both ordered logic and ...

there are different studies in urban literature on the determinants of urban growth, from the theoretical and empirical points of view. the most completed theoretical model is henderson model (1988, 1997, and 1999), which is tested by some empirical studies. as henderson model shows, the set of national product, specialization and technological progress are the determinants of urban growth. usi...

Concept learning from examples in first-order languages has been widely studied recently. Specifically, many systems that integrate inductive learning and explanationbased learning have been proposed. However, concept learning is only a subproblem of the problem of knowledge base (which is referred to as a theory in first-order logic) revision. This is mainly because concept learning methods ut...

The use of a constant discount rate to study long-lived environmental problems such as global warming has two disadvantages: the prescribed policy is sensitive to the discount rate, and with moderate discount rates, large future damages have almost no effect on current decisions. Timeconsistent quasi-hyperbolic discounting alleviates both of these modeling problems, and is a plausible descripti...

We present a method for the unsupervised segmentation of data streams originating from diierent unknown sources which alternate in time. We use an architecture consisting of competing neural networks. Memory is included in order to resolve ambiguities of input-output relations. In order to obtain maximal specialization , the competition is adiabatically increased during training. Our method ach...

This paper provides a framework for explicitly modeling the information gathering activities of potential entrants and analyzes how entry behavior is affected by these activities. We assume that information is acquired secretly and that firms face uncertainty about more than one variable. When costs of information gathering are small, entry decisions are as if firms had perfect information so t...

This article examines the geographical corridors for the establishment of rice in seventeenth-century Dutch Guiana. One corridor of introduction is associated with the expulsion of Dutch planters from Brazil in 1644, whose slaves reestablished longstanding subsistence preferences with their exodus to the colony. Another corridor links its introduction to the African Gold Coast, where rice devel...