2 years bound together in 1 vol. in-4to, [viii], 560, [30] pages, ill. with 6 copper plates. The most important article in this scientific volume is: Constructio aequationum quarundam differentialium quae indeterminatarum separationem non admittunt. (on pages 369-373) This translates as: 'The transformation of certain differential equations, which do not permit the separation of variables'; it concerns the Ricatti equation. Age-toned due to the quality of the paper. Contemporary polished calf binding, spine richly gilt, red edges
Euler seems to be using the Nova acta eruditorum to make a kind of research announcement, probably to protect his priority on the results in two articles (Specimen de constructione aequationum differentialium ... and Construction aequationis differentialis) that would not actually be published for another five years"" Ref. Ed Sandifer, The early mathematics of Leonar Euler p. 91
