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Una generalizzazione del birapporto sopra un anello

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Abstract

We generalize to the case of the projective line over a (not necessarily commutative) ring the well-know theorem on the bijective maps preserving a given cross-ratio.

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Authors and Affiliations

  1. Dipartimento di Matematica ed Applicazioni dell’ Università di Palermo, Via Archirafi, 34, I-90134, Palermo, (Italy)

    Leonardo Cirlincione & Maria Rosaria Enea

Authors
  1. Leonardo Cirlincione
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  2. Maria Rosaria Enea
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Ricerca finanziata con fondi R.S. 40% del M.P.I.

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Cirlincione, L., Enea, M.R. Una generalizzazione del birapporto sopra un anello. Rend. Circ. Mat. Palermo 39, 271–280 (1990). https://doi.org/10.1007/BF02844762

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  • DOI: https://doi.org/10.1007/BF02844762

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