Sul significato topologico di certe equazioni differenziali del secondo ordine
Generalizations of properties of differentiable manifolds first given by B. Segre.
Several constructions of a cross-ratio equivalent to the plurisectional ratio (studied by Mobius, Poncelet and Longo) of a closed polygon with a point on each side in any projective space.
A new proof of a characteristic property of Veronese surfaces given by Corrado Segre.
New proof of a theorem given by F. Speranza on manifolds whose surfaces possess everywhere osculating spaces of dimensionality < 5.
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