Luís Afonso, cartoonista

Luís F . Seoane Ambiguity in language networks

Human language defines the most complex outcomes of evolution. The emergence of such an elaborated form of communication allowed humans to create extremely structured societies and manage symbols at different levels including, among others, semantics. All linguistic levels have to deal with an astronomic combinatorial potential that stems from the recursive nature of languages. This recursivene...

Success : Antecedents of End - User Satisfaction with ERP Autoria : Luís

The main aim of the present study was to identify the antecedents of end-user satisfaction with Enterprise Resource Planning (ERP), in the context of a retail South American bank. Information system (IS) success theory was used in a strict sense for enduser computing satisfaction (EUCS) assessment through quantitative data, when descriptive analysis was applied, while in a broad sense with cont...

Portuguese Research Institutions in History José Luís Cardoso

Brazil: An Evolving Federation, by José Roberto R. Afonso and Luiz de Mello, November, 2000

Brazil is a highly decentralized federation. The 27 states (including the Federal District) and 5,559 municipalities together account for over one-third of total government spending and revenue collection. States and municipalities also account for almost 40 percent of the public sector’s net debt stock. Revenue mobilization capacity is concentrated in the more prosperoud states and municipalit...

Sharp Nonasymptotic Bounds on the Norm of Random Matrices with Independent Entries by Afonso

This bound is optimal in the sense that a matching lower bound holds under mild assumptions, and the constants are sufficiently sharp that we can often capture the precise edge of the spectrum. Analogous results are obtained for rectangular matrices and for more general subgaussian or heavy-tailed distributions of the entries, and we derive tail bounds in addition to bounds on the expected norm...