E5 -- Problematis traiectoriarum reciprocarum solutio
(Solution to the problem of reciprocal trajectories)
This article contains Euler's first published use of complex numbers and a many-axis geometric construction.
Euler also calls functions f(x) for which f(x) = f(-x) even functions, perhaps the first use of this term.
Originally published in Commentarii academiae scientiarum Petropolitanae 2, 1729, pp. 90-111
Opera Omnia: Series 2, Volume 6, pp.
Reprinted in Comment. acad. sc. Petrop. 2, ed. nova, Bononiae 1741, pp. 79-97 + 1 diagram
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