1,001 research outputs found

    Remarks on Stampacchia Lemma

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    We compare two versions of Stampacchia Lemma and we give an application to the regularity of entropy solutions to some anisotropic boundary value problems

    A Tailor made System for providing Personalized Services

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    Today, the existing technologies, such as smartphone and other pervasive devices, can be used for context awareness and help people to undertake conscious choices. In fact, unlike what happened in the past, all of these data are managed and contextualized for the particular application. We need to understand, select, treat and finally opportunely expose these data. In this scenario, there are many Context Aware applications. This paper introduces a tailor made system for providing personalized services and it is based on a graphical formalism for the context representation: The Context Dimension Tree. This system provides the needed information about places that are of great interest for the visitors, selecting them using user preferences. A case study is applied to an event in Salerno, an Italian town, called Artist's Lights. Finally, an experimental campaign has been conducted, obtaining interesting results

    Lindenbaum’s Lemma via Open Induction

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    With Raoult’s Open Induction in place of Zorn’s Lemma, we do a perhaps more perspicuous proof of Lindenbaum’s Lemma for not necessarily countable languages of first-order predicate logic.We generally work for and with classical logic, but say what can be achieved for intuitionistic logic, which prompts the natural generalizations for distributive and complete lattices

    Il project financing tra crisi finanziaria e ripresa economica.

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    La crisi e i limiti operativi del mercato finanziario. Criticità di sistema e meccanismi di project financing.La crisi e i limiti operativi del mercato finanziario. Criticità di sistema e meccanismi di project financing.LUISS PhD Thesi

    Alessandro Manzoni e Francesco Lomonaco: sul lemma ‘prudenza’ nel Conte di Carmagnola

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    Sulla scorta dei più accreditati studi critici su Francesco Lomonaco quale « amico e maestro » di Alessandro Manzoni, si intende riflettere sul lemma ‘prudenza’ presente nel Conte di Carmagnola : lemma che, più volte ricorrente nel testo manzoniano in quanto nucleo concettuale dell’opera stessa, rappresenta anche il principio primo da cui il Lomonaco aveva mosso la sua intera riflessione filosofico-letteraria. Il concetto di ‘prudenza’ – declinato in evidente contrapposizione ai criteri di Ragion di Stato che tra la fine del Cinquecento e il Seicento lo avevano sottoposto ad una torsione semantica – mostra non pochi punti di tangenza con la linea di pensiero dell’illuminista lucano : il principio vichiano del verum ipsum factum, la potenza del tempo, la fortuna, la misura delle passioni, la dissimulazione. Accanto alle suggestioni teoriche che le pagine del Lomonaco possono aver sollecitato nell’arte scrittoria del Manzoni non vanno comunque dimenticate le divergenze di pensiero : si pensi ai toni provvidenzialistici con cui si chiude la tragedia manzoniana

    The Yakubovich S-Lemma Revisited: Stability and Contractivity in Non-Euclidean Norms

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    The celebrated S-Lemma was originally proposed to ensure the existence of a quadratic Lyapunov function in the Lur'e problem of absolute stability. A quadratic Lyapunov function is, however, nothing else than a squared Euclidean norm on the state space (that is, a norm induced by an inner product). A natural question arises as to whether squared non-Euclidean norms V(x)=x2V(x)=\|x\|^2 may serve as Lyapunov functions in stability problems. This paper presents a novel non-polynomial S-Lemma that leads to constructive criteria for the existence of such functions defined by weighted p\ell_p norms. Our generalized S-Lemma leads to new absolute stability and absolute contractivity criteria for Lur'e-type systems, including, for example, a new simple proof of the Aizerman and Kalman conjectures for positive Lur'e systems

    A context aware approach for promoting tourism events: The case of artist's lights in Salerno

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    This paper introduces a Context Aware App for the tourism. This app is based on a graphical formalism for the context representation: The Context Dimension Tree. The aim is to propose a Context Aware approach that acts as dynamic support for the tourists, equipped of a mobile device which reacts to a change of context adapting user interface, according to his/her current position and global profile. For example, the system can guide the tourist in the discovery of a town proposing him/her events mainly interesting for the user. A case study applied to a Christmas event in Salerno, an Italian town, has been analyzed considering various users (Italian tourists, foreign tourists, etc.) and an experimental campaign has been conducted, obtaining interesting results

    Francesco Paolo Cantelli

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    Francesco Paolo Cantelli made fundamental contributions to the foundations of probability theory and to the clarification of different types of probabilistic convergence. He is remembered through the Borel-Cantelli Lemma, the Glivenko-Cantelli Theorem, and Cantelli's Inequality. He also made seminal contributions to actuarial science. Copyright 2007 The Authors. Journal compilation (c) 2007 International Statistical Institute.
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