2,452 research outputs found
Wild Kernels and divisibility in K-groups of global fields
In this paper we study the divisibility and the wild kernels in algebraic
K-theory of global fields We extend the notion of the wild kernel to all
K-groups of global fields and prove that Quillen-Lichtenbaum conjecture for
is equivalent to the equality of wild kernels with corresponding groups of
divisible elements in K-groups of We show that there exist generalized
Moore exact sequences for even K-groups of global fields. Without appealing to
the Quillen-Lichtenbaum conjecture we show that the group of divisible elements
is isomorphic to the corresponding group of \' etale divisible elements and we
apply this result for the proof of the analogue of Quillen-Lichtenbaum
conjecture. We also apply this isomorphism to investigate: the imbedding
obstructions in homology of the splitting obstructions for the Quillen
localization sequence, the order of the group of divisible elements via special
values of Using the motivic cohomology results due to Bloch,
Friedlander, Levine, Lichtenbaum, Morel, Rost, Suslin, Voevodsky and Weibel,
which established the Quillen-Lichtenbaum conjecture, we conclude that wild
kernels are equal to corresponding groups of divisible elementsComment: 36 page
Contribution to bee fauna (Hymenoptera, Apoidea) of Poland. IV
Hyleus lepidulus Cockerell and Eucera pollinosa Smith (= E. polonica
Ruszkowski, syn. nov.) are recorded for the first time from Poland. New records of further
5 rare species are given.Zadanie pt. „Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki” nr 885/P-DUN/2014 zostało dofinansowane ze środków MNiSW w ramach działalności upowszechniającej naukę
Testing Theories of Cooperative Arrangements in Agricultural Markets: Results from Producer Groups in Poland
The main question posed in the paper asks why do some cooperative arrangements in agricultural markets survive and succeed and others fail? We define success and factors affecting success of cooperation using transaction costs theory and game theory. Transaction costs theory provides insights on comparative advantage of one form of organization versus others and proposes, while game theory focuses on interdependencies between partners entering the arrangements. Data were collected from 62 Polish farmer cooperative organizations called producer groups. The main aim of those organizations was to organize joint sales of output produced individually by their members. Some of the groups were functioning effectively while others that had disbanded or were no longer performing their essential functions. Variables such as the leaders strength, previous business acquaintances, initial selection of members, and number of members have a significant positive impact on the likelihood of success of the researched organizations.Cooperation, agricultural markets, producer groups, Poland, Agribusiness, Marketing,
Przestrzenne i czasowe zróżnicowanie Apoidea w lasach Wielkopolskiego Parku Narodowego
Results of the investigations of spatial and temporal differentiations of Apoidea in
the forests of Wielkopolski National Park were presented. It was shown that the both
forest floor differ with the degree of species differentiation and domination’s structure
and total number of bees. In the herbaceous layer of the forests about twice as many
spedes were found than in the crowns. Also the Shannon-Weaver’s indices for bees
communities of the herbs layer are higher in all three investigated forest ecosystems.
The curves of Apoidea numbers in tree crowns and forest floor were similar. The
curves of Apoidea numbers in the deciduous forests have one peak in the first days of
May. Whereas the curves of Apoidea numbers in the pine forest have multi peak course.
It was proved that trees play an important role in feeding chain of bees inhabiting
deciduous forests.Zadanie pt. „Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki” nr 885/P-DUN/2014 dofinansowane zostało ze środków MNiSW w ramach działalności upowszechniającej naukę
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