2,557,320 research outputs found
Artin groups associated to infinite Coxeter groups
No full textAbstractFirst we remark that the cellular complex constructed by Salvetti (1994) can be considered as a ‘topological’ invariant of a graph, so its cohomology is also an invariant. We use the construction of Salvetti (1994) to calculate the cohomology of the Artin group associated to the complete graph Kn, using coefficients in a local system over Z[q,q−1]. The standard cohomology over Z is obtained by specializing q to 1. While doing such computations, we obtain also an explicit rational function for the Poincaré series of the Coxeter group associated to Kπ, and note that it has exponential growth for n⩾4
Sobre as práticas e reflexões publicitárias de Fernando Pessoa
No full textNeste texto, a autora analisa alguns trabalhos publicitários de Fernando Pessoa, bem
como algumas das suas reflexões sobre esta actividade. É dada especial atenção ao slogan
“Primeiro estranha-se. Depois entranha-se”, analisado sobre a perspectiva das funções
e propriedades deste constituinte da mensagem publicitária. Por fim, recorda-se
um recente slogan que recupera o clássico de Fernando Pessoa.
On this article, the author analyses some advertising texts created by Fernando Pessoa and
some of his thoughts about this activity. The main attention goes to the famous slogan “Primeiro
estranha-se. Depois entranha-se”, analysed through the principles of the functions
and proprieties of this element of advertisements. Finally, the author presents a recent slogan, constructed through the slogan of the Portuguese writer
The Morse complex of a line arrangement
No full textLet M(A) be the complement in C2 of a complexified line arrangement. We provide compact formulas for a Morse complex which computes the (co)homology of M(A) with coefficients in an abelian local system. This refines and simplifies, in the two-dimensional case, a general construction appeared in [M. Salvetti, S. Settepanella, Combinatorial Morse theory and minimality of hyperplane arrangements, Geom. Topol. 11 (2007) 1733–1766], giving also a direct geometrical interpretation
Banci Jumping - Laboratorio creativo. Un'esperienza unica nella Piana di Firenze - Prato - Pistoia
No full textProgetto di sviluppo dell'area Ex Banci a Prato. Project Leader: Paolo Iotti (Iotti+Pavarani), Tutors: Vincenzo Moschetti e Eugenio Salvetti, Collaboratori: Irene Battiston, Giacomo Iacussi, Cesare Treccioni, Taifu Zheng
Banci Jumping - Laboratorio creativo. Un'esperienza unica nella Piana di Firenze - Prato - Pistoia
No full textProgetto di sviluppo dell'area Ex Banci a Prato. Project Leader: Paolo Iotti (Iotti+Pavarani), Tutors: Vincenzo Moschetti e Eugenio Salvetti, Collaboratori: Irene Battiston, Giacomo Iacussi, Cesare Treccioni, Taifu Zheng
Corrigendum: A Perspective of Coagulation Dysfunction in Multiple Sclerosis and in Experimental Allergic Encephalomyelitis
No full textIn the published article, there was an error regarding the affiliations for Marco Salvetti. As well as having affiliation “3,” he should also have “IRCCS Istituto Neurologico Mediterraneo (INM) Neuromed, Pozzilli, Italy.” There was also an omission in the affiliation for Tatiana Koudriavtseva. Instead of “Department of Clinical Experimental Oncology, Regina Elena National Cancer Institute, Rome, Italy”, it should be “Department of Clinical Experimental Oncology, IRCCS Regina Elena National Cancer Institute, Rome, Italy”. The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated. Copyright © 2019 Plantone, Inglese, Salvetti and Koudriavtsev
Las causas de extinción del derecho de viudedad en el derecho civil aragonés
No full textPublicación número 2.591 de la Institución Fernando el CatólicoCopia digital. Zaragoza, 201
Escrito a RTE de Fernando Rodríguez Ayuso
No full textEscrito a RTE de Fernando Rodríguez Ayuso con fecha del 25 de septiembre de 1967
Escrito a RTE de Fernando Rodríguez Ayuso
No full textEscrito a RTE de Fernando Rodríguez Ayuso con fecha del 25 de septiembre de 1967
Combinatorial Morse theory and minimality of hyperplane arrangements
No full textUsing combinatorial Morse theory on the CW-complex S constructed in Salvetti [15] which gives the homotopy type of the complement to a complexified real arrangement of hyperplanes, we find an explicit combinatorial gradient vector field on S, such that S contracts over a minimal CW-complex. The existence of such minimal complex was proved before Dimca and Padadima [5] and Randell [14] and there exists also some description of it by Yoshinaga [19]. Our description seems much more explicit and allows to find also an algebraic complex computing local system cohomology, where the boundary operator is effectively computable
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