On projective planes of order 20
On the automorphism group of planes of Figueroa type
On the dimensions of automorphism groups of four-dimensional double loops.
Piani di traslazione derivabili
Real analytic projective planes with large automorphism groups.
Sopra una classe di piani -transitivi
Subplanes of order 3 in Hughes planes.
Sui derivati dei piani desarguesiani
Ternärringe ohne Planaritätsbedingung
The contributions of Hilbert and Dehn to non-archimedean geometries and their impact on the italian school
In this paper we investigate the contribution of Dehn to the development of non-Archimedean geometries. We will see that it is possible to construct some models of non-Archimedean geometries in order to prove the independence of the continuity axiom and we will study the interrelations between Archimedes’ axiom and Legendre’s theorems. Some of these interrelations were also studied by Bonola, who was one of the very few Italian scholars to appreciate Dehn’s work. We will see that, if Archimedes’...
The group of projectivities in free-like geometries
The n-point-invariants of the projective line and cross-ratios of n-tuples
The proof of the isomorphism of the -dimensional projective spaces defined axiomatically
The paper gives a proof (without of using of “great” Desargues’ axiom) that any two axiomatically defined n - dimensional projective spaces are isomorphic.
Über Moufang-Ovale.
Über Ordnungsverhältnisse auf affinen Ebenen
Über Translationsebenen mit Kollineationsgruppen, die die Punkte der ausgezeichneten Geraden zweifach transitiv permutieren.
Zur Existenz eines Ordnungsverhältnisses auf der affinen Ebene
Zur Theorie endlicher geschlitzter Inzidenzgruppen.
О теории физических структур