Antichain cutsets of strongly connected posets

Rival and Zaguia showed that the antichain cutsets of a finite Boolean lattice are exactly the level sets. We show that a similar characterization of antichain cutsets holds for any strongly connected poset of locally finite height. As a corollary, we get such a characterization for semimodular lattices, supersolvable lattices, Bruhat orders, locally shellable lattices, and many more. We also consider a generalization to strongly connected hypergraphs having finite edges.Comment: 12 pages; v2 contains minor fixes for publicatio

Linear resolutions of powers and products

The goal of this paper is to present examples of families of homogeneous ideals in the polynomial ring over a field that satisfy the following condition: every product of ideals of the family has a linear free resolution. As we will see, this condition is strongly correlated to good primary decompositions of the products and good homological and arithmetical properties of the associated multi-Rees algebras. The following families will be discussed in detail: polymatroidal ideals, ideals generated by linear forms and Borel fixed ideals of maximal minors. The main tools are Gr\"obner bases and Sagbi deformation

Phytonematodes of the Apricot (Prunus Armeniaca) in the Southern Regions of the Surkhandarya Region of Uzbekistan

The article provides data on the fauna and distribution of phytonematodes in the root soil and root system of apricot plants in the southern regions of the Surkhandarya region of Uzbekistan. In the fauna of phytonematodes in apricot plants, numerous species were Cephalobus persegnis, Chiloplacus sclerovaginatus, Ch.quintastriatus, Panagrolaimus rigidus, Aphelenchus avenae, Aphelenchoides parietinus, A.composticola, A.limberi, A.blasthophthorus, A.graminis, Helicotylenchus erythrinae, Pratylenchus pratensis and Ditylenchus dipsaci

Y-Chromosome Haplogroup Diversity in Khazar Burials from Southern Russia

Genetic studies of archaeological burials open up new possibilities for investigating the cultural-historical development of ancient populations, providing objective data that can be used to investigate the most controversial problems of archeology. In this work, we analyzed the Y-chromosomes of nine skeletons recovered from elite burial mounds attributed to the 7th-9th centuries of the Khazar Khaganate in the modern Rostov region. Genotyping of polymorphic microsatellite loci of the Y chromosome made it possible to establish that among the nine skeletons studied, three individuals had R1a Y-haplogroup, two had C2b, and one each had G2a, N1a, Q, and R1b Y-haplogroups. Such results were noteworthy for the mixture of West Eurasian and East Asian paternal lineages in these samples. The Y-chromosome data are consistent with the results of the craniological study and genome-wide analysis of the same individuals in showing mixed genetic origins for the early medieval Khazar nobility. These findings are not surprising in light of the history of the Khazar Khaganate, which arose through its separation from the Western Turkic Khaganate and establishment in the North Caucasus and East European steppes

AS INFLUÊNCIAS DO CIRCO SOCIAL PARA OS EGRESSOS DA ESCOLA DE CIRCO DOM FERNANDO/INSTITUTO DOM FERNANDO/PROEX PUC-GO, GOIÂNIA 1998-2009.

Made available in DSpace on 2016-08-10T10:32:10Z (GMT). No. of bitstreams: 1 DANILO JOAQUIM DA SILVA.pdf: 1790693 bytes, checksum: 2994e91dbb3cf56d96bad2d4cf273802 (MD5) Previous issue date: 2013-08-26This dissertation aims to understand how the lived experience in Circus School Dom Fernando - ECDF influenced formation of children and adolescents in the Eastern Region of Goiânia identifying the role of this program for graduates of the period 1998-2009. The study was conducted in a qualitative perspective using to achieve the proposed objectives the following methodology: literature review, documentary research and empirical research. We analyzed the landmarks and public policies related to adolescence and youth in Brazil, the evolution of the social circus proposed as an alternative teaching from the perspective of nonformal education, in work with children, adolescents and young subaltern classes. For this feasibility study were interviewed using semi-structured, which we accomplished graduates ECDF enrollments between 1998 and 2009 and remained enrolled and attending at least two years. The research revealed that the ECDF, constitutes a major influence on its graduates, towards social emancipation, but work the importance of working with children and youth using the circus, which is characterized by a simple language but very attractive also motivates them to continue participating.Esta dissertação objetiva compreender de que forma a experiência vivenciada na Escola de Circo Dom Fernando ECDF influenciou na formação de crianças e adolescentes da Região Leste de Goiânia identificando o papel desse Programa para os egressos do período de 1998 a 2009. O estudo foi desenvolvido em uma perspectiva qualitativa utilizando para o alcance dos objetivos propostos os seguintes procedimentos metodológicos: revisão bibliográfica, a pesquisa documental e a pesquisa empírica. Foram analisados os marcos históricos e as políticas públicas relacionadas à adolescência e a juventude no Brasil, a evolução da proposta do Circo Social como uma alternativa pedagógica na perspectiva da educação não formal, no trabalho junto a crianças, adolescentes e jovens das classes subalternas. Para viabilização desta pesquisa foram entrevistados por meio de roteiro semiestruturado, egressos da ECDF que efetivaram matrículas entre os anos de 1998 e 2009 e permaneceram matriculados e frequentando por pelo menos um ano. A pesquisa revelou que a ECDF, se constitui em uma grande influência para seus egressos, no sentido de sua emancipação social, além de trabalhar a importância de se trabalhar com o público infanto-juvenil utilizando a arte circense, que tem como característica um linguagem simples, porém muito atrativa que também os motiva a continuar participando