d'Alembert, J. le Rond, et al. — Encyclopédie méthodique. Mathématiques. Tome premier, tome second, tome troisième. [AND] Recueil de planches de l’Encyclopédie par ordre de matières. Mathématiques. [Complete for the mathematics proper].

Paris, Panckoucke; Liège, Plomteux, 1784-1785. Three volumes in three. Large 4to (25.3 x 20.5 cm). 2,090 pp. [cxiv, 722; 787; 184]; 108 engraved plates (many double-sized, folded). Contemporary quarter calf over marbled boards. Spine with elaborate gilt-patterned band, gilt vignettes, and gilt title. Marbled edges. = The rare, complete mathematics section of the famous 'Encyclopédie'. In some copies, the supplemental Jeux-section (with 16 plates) is added to the Mathematique, whereas the true Mathematique-plates are absent. But this set is complete, regarding the pure mathematics, and as intended. A detailed collation is as follows: Volume 1 (1784) title to the 'Encyclopédie', title to the Mathematiques, cxiv pp. (Discours préliminaire), pp. 1-721 [A-EXT; actually Abaissement-Extrème], [i] (errata); Volume 2 (1785), title to the 'Encyclopédie', title to the volume; pp. 1-787 (FAC-ROU; actually Face-Rudolphines); Volume 3 (1789), title to the 'Encyclopédie', title to the volume, pp. xxviii, 1-56, 1-184 (SAG-SUR, actually Saggitaire-Zubenel-Chemali, additions et corrections, table de lecture)'; 108 plates, as follows: Géométrie 1-16, Sections coniques 1-3, Trigonométrie 1, Arpentage 1-2, Algèbre 1-3, Analyse 1-2, Mécanique 1-9, Hydrostatique etc. 1-7, Hydraulique 1-4 [3-4 not numbered], Hydraulique (machines) 1-2, 1, 1-2, 1-6 [total 11], Optique 1-6, Perspective 1; Astronomie 1-43. Boards much worn and detached; spine covers near-entirely abraded; some toning; otherwise (in particular internally), a very good set.