‎"EULER, LEONHARD.‎
‎Sur une Contradiction apparente dans la Doctrine des Lignes courbes (On an apparent contradiction in the theory of curves) + (continuation:) Demonstration sur le Nombre des Points, ou deux Lignes des Ordres quelques peuvent se couper (A proof concerni...‎

‎(Berlin, Haude et Spener, 1750). 4to. No wrappers, as issued in ""Mémoires de L'Academie Royale des Sciences et Belles-Lettres"", tome IV, pp. (219)-233 and (234)-248.‎

Reference : 36110

‎First edition of two early works by Euler on ""Higher Plane Curves"". He discusses the question of whether nine points determine a unique cubic curve, considers the same question for 14 points and quadratic curves, 20 points and so on. He solves the problem using a system of equations. In the following paper he concludes that there are at most mn points of intersection, with some of the points possibly imaginary. - Eneström, Euler Bibliography E 147 a. E 148.‎