Armin Herzer, Guglielmo Lunardon (1984)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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In this paper we give a characterisation of the Galois spreads, which are defined in [5] for the construction of the indicator set.
Domenico Olanda (1977)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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In this paper, the quadrangles of Tits embedded in a Galois space are characterized: they are just the classical ones. Thus the Author's previous results (cfr. [6]) are completed. The author wishes to thank Prof. G. Tallini for helpful discussions on this subject.
Andrea Brini (2004)
Bollettino dell'Unione Matematica Italiana
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The notion of Galois Connections between partially ordered sets is introduced, together with a presentation of some of its main characterizations. This leads to a true understanding of the deep connection that links Galois Connections to Quillen’s Homotopy Type Equivalence Theorem. Furthermore, the notion of Möbius functions of finite lattices is discussed, in order to show its crucial role in Enumerative Combinatorics over Finite Posets and Discrete Probability Theory. Since the values...
Lelek, A.
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Šostak, A. P.
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Carlo Viola (2008)
Bollettino dell'Unione Matematica Italiana
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We recall some basic concepts in diophantine approximation, in particular the notion of irrationality measure. We describe the main aspects of the permutation group method due to G. Rhin and the author, with some arithmetical applications.
Marco Degiovanni (1982)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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In the present paper we seek the bounce trajectories in a convex set which assume assigned positions in two fixed time instants. We find sufficient conditions in order to obtain the existence of infinitely many bounce trajectories.
Marco Degiovanni (1982)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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In the present paper we seek the bounce trajectories in a convex set which assume assigned positions in two fixed time instants. We find sufficient conditions in order to obtain the existence of infinitely many bounce trajectories.
Rocek, Martin
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Francesco Mazzocca (2001)
Bollettino dell'Unione Matematica Italiana
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We present a survey on classical problems of Galois geometries. More precisely we discuss some problems and results about ovals, hyperovals, caps, maximal arcs and blocking sets in projective planes and spaces over Galois fields.
Alessandro Scarselli (1983)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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We prove that every abelian finite group is contained in the intersection of the nontrivial normal classes introduced by Zappa.
Alessandro Scarselli (1983)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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We prove that every abelian finite group is contained in the intersection of the nontrivial normal classes introduced by Zappa.