8,336 research outputs found
Comparison morphisms and the Hochschild cohomology ring of truncated quiver algebras
A main contribution of this paper is the explicit construction of comparison
morphisms between the standard bar resolution and Bardzell's minimal resolution
for truncated quiver algebras (TQA's).
As a direct application we describe explicitely the Yoneda product and derive
several results on the structure of the cohomology ring of TQA's. For instance,
we show that the product of odd degree cohomology classes is always zero. We
prove that TQA's associated with quivers with no cycles or with neither sinks
nor sources have trivial cohomology rings. On the other side we exhibit a
fundamental example of a TQA with non trivial cohomology ring. Finaly, for
truncated polyniomial algebras in one variable, we construct explicit
cohomology classes in the bar resolution and give a full description of their
cohomology ring.Comment: 32 pages, Final Versio
ESTADO E GOVERNO NO PENSAMENTO DE MARSĂLIO DE PĂDUA: RAĂZES MEDIEVAIS DE UMA TEORIA MODERNA
This study brings light to the concepts of State and Government in the thought of Marsilio de Padua pointing out to profoundly modern institutions present in the reflection of this medieval philosopher. We attempt to show that Marsilio de Padua reflects based on AristotleÂŽs categories, but proposes a State and Government conception different from that common place of medieval politics as he insists on the need of the popular consent as a criterion of political legitimacy.
O estudo explicita os conceitos de Estado e de Governo no pensamento de MarsĂlio de PĂĄdua
apontando as intuiçÔes profundamente modernas presentes na reflexão desse filósofo medieval.
Procuramos mostrar que MarsĂlio reflete com categorias aristotĂ©licas, mas propĂ”e uma concepção
de Estado e de Governo que se distancia do lugar comum da reflexĂŁo polĂtica medieval ao insistir
na necessidade do consentimento dos sĂșditos como critĂ©rio de legitimidade polĂtica
Symmetric periscope for concentric beam configuration in an ultra-high precision laser interferometric beam launcher
An optical component especially suited for common path heterodyne interferometry comprises a symmetric dual-periscope configuration. Each periscope is substantially identical to the other with regard to certain design aspects. The resulting design is an optical component that is highly stable with variations in temperature and angular deviations
Chandler v. Miller: Redefining Special Needs for Suspicionless Drug Testing Under the Fourth Amendment
This Note will discuss the three Supreme Court cases that, up to now, have defined Fourth Amendment doctrine regarding suspicionless drug testing in the public sector: National Treasury Employees Union v. Von Raab, Skinner v. Railway Labor Executivesâ Association, and Vernonia School District v. Acton. Specifically, this Note will focus on the special needs analysis as it was articulated in these cases, as well as how that analysis was altered in Chandler. This Note will then thoroughly analyze the Chandler decision, pointing out its strengths in eliminating some of the subjectivity of Fourth Amendment doctrine. It will also explain the opinionâs weakness in failing to articulate its holding as a new statement of the law
The morphology of the syrinx in passerine birds
The syrinx, for more than a century an important organ in determining the subdivisions of the avian order Passeriformes (perching birds), was examined in 983 specimens, representing 65 of the 67 families recognized by most modern authoritiesâŠ.https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/1036/thumbnail.jp
The genus Sipha Passerini (Hemiptera: Aphididae) in North America
Five species of the aphid genus Sipha Passerini (Hemiptera: Aphididae) are reported in North America and are reviewed herein. Of these species, three are adventive species and include: Sipha elegans del Guercio, Sipha glyceriae (Kaltenbach), and Sipha maydis Passerini. Sipha maydis was discovered in California in 2007 and now has been found in Georgia. The genus also includes two native species: Sipha agropyronensis (Gillette) and Sipha flava (Forbes). Sipha maydis can be distinguished easily from all the other species in the genus that occur in North America because it is black. All the species except S. agropyronensis have been implicated in damage to crop plants. A key to the apterae and alatae of Sipha found in North America is included
Alien Registration- Ames, Kenneth L. (Lagrange, Penobscot County)
https://digitalmaine.com/alien_docs/7742/thumbnail.jp
A CENSORED SYSTEM ESTIMATION OF HISPANIC HOUSEHOLD FOOD CONSUMPTION PATTERNS
A system of nine censored Engel curve equations was estimated for Hispanic households in the U.S.: grains, vegetables, fruits, milk, meat, legumes, fats, sugar, and beverages. Income and household size elasticities, with their respective confidence intervals, are reported and the results compared with other ethnic groups in the U.S.Food Consumption/Nutrition/Food Safety,
COMPARISONS OF HISPANIC HOUSEHOLDS' DEMAND FOR MEATS WITH OTHER ETHNIC GROUPS
The objective of this research was to analyze the demand patterns of Hispanic households for meats in comparison with other ethnic groups using data from the 1998 Consumer Expenditure Survey. A system of demand equations of the LinQuad form were estimated for ten meat products using an incomplete system of censored equations. Hispanic households showed a clear preference for beef. Price, income, and household-size elasticities were estimated for each meat product by ethnic group. The demand for ground beef was the most income-inelastic product regardless of ethnicity. Household size had a positive effect on the probability of consuming a particular meat product but a negative effect on actual item expenditures.Consumer/Household Economics, Demand and Price Analysis,
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