MÖBIUS (August Ferdinand). Der barycentrische Calcul, ein neues Hülfsmittel zur analytischen Behandlung der Geometrie. Leipzig, J. A. Barth, 1827. In-8, demi-basane fauve, dos orné, tranches marbrées (Reliure de l'époque). Édition originale, illustrée de 4 planches dépliantes. « The present volume represents not only Möbius' most important contribution, but the source of much of his later work. He had developed the fundamental ideas for his barycentric calculus in 1818 and by 1821 had decided that they warranted a book-length treatment. Since barycentric coordinates are a form of homogenous coordinate, Möbius is recognized by Feuerbach and Plücker as a discoverer of homogenous coordinates. » (Bibliotheca Mechanica, p. 227). Möbius' « greatest work, which later became a mathematical classic » (DSB). Cachet du collège d'Exaten. De la bibliothèque scientifique Peter et Margarethe Braune (2020, I, n°921). Dos et coins frottés, rousseurs et piqûres.