Recent trade data exhibit the following four empirical regularities: (i) countries import only a small fraction of all traded varieties (ii) per capita income and the number of imported varieties correlate positively (iii) per capita income and trade shares correlate positively and, finally, (iv) world trade shares have increased substantially. The present paper argues that standard theories fa...

In this paper, we prove that rational homogeneous bundles and log homogeneous varieties (studied by M. Brion) have an absolute Chow–Künneth decomposition. This strengthens the earlier paper by us on small dimensional varieties with a NEF tangent bundle, and using Hwang-Mok’s results, we get the results for new cases in higher dimension as well, for instance upto dimension four.

In this paper we take new steps in the theory of symplectic and isotropic bifurcations, by solving the classification problem under a natural equivalence in several typical cases. Moreover we define the notion of coisotropic varieties and formulate also the coisotropic bifurcation problem. We consider several symplectic invariants of isotropic and coisotropic varieties, providing illustrative e...

The most important tool for classifying recognizable languages is Eilenberg’s variety theorem [1], which gives a one-to-one correspondence between (pseudo)-varieties of finite semigroups and varieties of recognizable languages. Varieties of recognizable languages are classes of recognizable languages closed under union, intersection, complement, left and right quotients and inverse morphisms. R...

in order to compare yield and agronomic characteristics of 38 new winter rapessed (brassica napus l.) cultivars along with okapi as check, a field experiment was carried out based on randomized complete block design during 2009-10 cropping season with three. rapeseed cultivars showed significant differences for all traits at 1 percent probability level. in this research, es betty, nk karibik, n...