E5  Problematis traiectoriarum reciprocarum solutio
(Solution to the problem of reciprocal trajectories)
Summary:
This article contains Euler's first published use of complex numbers and a manyaxis geometric construction.
Euler also calls functions f(x) for which f(x) = f(x) even functions, perhaps the first use of this term.
Publication:

Originally published in Commentarii academiae scientiarum Petropolitanae 2, 1729, pp. 90111

Opera Omnia: Series 2, Volume 6, pp.

Reprinted in Comment. acad. sc. Petrop. 2, ed. nova, Bononiae 1741, pp. 7997 + 1 diagram
[E5a]
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