Information flows are weaker in a heterogeneous population when the performance of a new technology is sensitive to unobserved individual characteristics, preventing individuals from learning from neighbors’ experiences. This characterization of social learning is tested with wheat and rice data from the Indian Green Revolution. The rice-growing regions display greater heterogeneity in growing ...

For Y, Y + three-dimensional smooth varieties related by a flop, Bondal and Orlov conjectured that the derived categories D b (coh(Y)) and D b (coh(Y +)) are equivalent. This conjecture was recently proved by Bridge-land. Our aim in this paper is to give a partially new proof of Bridgeland's result using non-commutative rings. The new proof also covers some mild singular and higher dimensional ...

A revision of material of a minute land snail species from the Caucasus region usually named Vertigo (Vertigo) sieversi (Boettger, 1879) (Pilsbry 1919; Schileyko 1984; Sysoev & Schileyko 2005; Egorov 2008; Sysoev & Schileyko 2009), including types of all described varieties revealed that adjustments of the delimitation and the nomenclature of this insufficiently known taxon are necessary. We re...

Obtaining large and quality productions requires, in addition to agrotechnical measures, the establishment of most appropriate symbiosis between grafts (varieties) rootstocks. This variety/rootstock union particularly influences tree growth, production quality. Knowing growth root system has an important role choosing use tillage, land. The varieties nectarine on frank peach rootstock had diffe...

§1. Geometry of finite type and review of CR-extension theory . . . . .2. §2. Identification of CR vector fields and of Segre varieties . . . . . . . . . .4. §3. Segre varieties and extrinsic complexification . . . . . . . . . . . . . . . . . . . .10. §4. Segre sets and iterated complexifications . . . . . . . . . . . . . . . . . . . . . . . . .12. §5. Segre varieties and conjugate Segre variet...

Let k be a totally real field, and let A/k be an absolutely irreducible, polarized Abelian variety of odd, prime dimension whose endomorphism rings is non-trivial and is defined over k. Then the only strictly compatible families of abstract, absolutely irreducible representations of Gal(k/k) coming from A are tensor products of Tate twists of symmetric powers of two-dimensional λ-adic represent...

Let V be a p-adic representation of the absolute Galois group G of Qp that becomes crystalline over a finite tame extension, and assume p 6= 2. We provide necessary and sufficient conditions for V to be isomorphic to the p-adic Tate module Vp(A) of an abelian variety A defined over Qp. These conditions are stated on the filtered (φ,G)module attached to V . 2000 Mathematics Subject Classificatio...

Tin mining activities in the Bangka Belitung Islands have been going on for a long time. A number of literates noted that tin this area had begun 1709 AD. occurs massively when government opens tap which was originally only allowed to be mined by certain parties, context PT. and Kobatin, can anyone, including general public. As result, became out control. mines target not areas such as rivers, ...

Abstract An increase in the cropping index causes land to be cultivated more intensively and has impact on decreasing Silica content (Si) so that it is necessary add Si support growth of rice plants, especially intensive land. This research aims study effect biosilica vegetative phase several very early maturing varieties. The was conducted from September December 2022 Gorontalo using a Split P...