Luís Antoni Santaló Sors (October 9, 1911 – November 22, 2001) was a Spanish mathematician.

His work with Blaschke on convex sets[1] is now cited in its connection with Mahler volume.

Hyperbolic geometry: graphic properties, angles and distances, areas and curves.

Other models of non-Euclidean geometry A curious feature of this book on projective geometry is the opening on abstract algebra including laws of composition, group theory, ring theory, fields, finite fields, vector spaces and linear mapping.

These seven introductory sections on algebraic structures provide an enhanced vocabulary for the treatment of 15 classical topics of projective geometry.

Serious and coordinated study of this text is invited by 240 exercises at the end of 25 sections, with solutions on pages 347–65.