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Strutture di André con gruppi di traslazioni transitivi non normali

Mauro Biliotti, Armin Herzer (1982)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

We give some examples of André-structures admitting translation groups which are transitive on the set of points but which are not normal in the dilatation group. André structures with this property seem to be new in the literature.

Sugli isomorfismi tra spazi di Grassman

Eva Ferrara Dentice, Nicola Melone (1999)

Bollettino dell'Unione Matematica Italiana

In this paper we prove that any incidence-preserving bijection between the line sets of Grassmann spaces is induced by either a collineation or a correlation.

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