On a singular rule for differentiating and integrating, which occurs in the sums of series
According to Eneström, this is about the differentiation and integration of infinite series. However, Euler only looks at finite series and integrates and differentiates them under the summation sign.
Original Source Citation
Nova Acta Academiae Scientiarum Imperialis Petropolitanae, Volume 6, pp. 3-15.
Opera Omnia Citation
Series 1, Volume 16A, pp.122-138.