With the development of databases in general and data warehouses in particular, it is now of a great importance to reduce the administration tasks of data warehouses. The materialization of views is one of the most important optimization techniques. The construction of a configuration of views optimizing the data warehouse is an NP-hard problem. On the other hand, the algorithm called extremal ...

Biological theory has long been a source of inspiration for economists, and the analogy between market competition and what Darwin called ‘the struggle for existence’ has informed both neoclassical and heterodox views of the firm. What has gone largely unnoticed, however, is that Darwin’s theory of evolution rests on two pillars. In nature, the process of ‘survival selection’ that has inspired ...

The Integrated Completed Likelihood (ICL) criterion has been proposed by Biernacki et al. (2000) in the model-based clustering framework to select a relevant number of classes and has been used by statisticians in various application areas. A theoretical study of this criterion is proposed. A contrast related to the clustering objective is introduced: the conditional classification likelihood. ...