a direct encoding for nnc polyhedra

We present an alternative Double Description representation for the domain of NNC (not necessarily closed) polyhedra, together with the corresponding Chernikova-like conversion procedure. The representation uses no slack variable at all and provides a solution to a few technical issues caused by the encoding of an NNC polyhedron as a closed polyhedron in a higher dimension space. A preliminary experimental evaluation shows that the new conversion algorithm is able to achieve significant efficiency improvements

CLASSIFICATION AND TYPOLOGY OF BILINGUALISM

This article covers contemporary achievements in the sphere of bilingualism, deepens the understanding of such phenomena as diglossia and language interference. Aim. We’ve tried to systematize the types of bilingualism based on different methods of classification. Matherials and Methods. Systems’ comparative and typological analysis. Results. The conducted analyses showed that bilingualism (as a phenomenon) has a number of common and specific features depending on many social indexes. We’ve compared the views of foreign and Russian scientists on the problem. The result is more exact understanding of bilingualism linguistic model. Conclusions. Mass bilingualism has become the norm of contemporary societ