Imaginary logarithms ... /
Euler, Leonhard,1707-1783.
Leapfrogs.
[Exeter] Leapfrogs
1978
'An annotated original translation of the first part of an article ... [entitled "De la controverse entre Mrs. Leibnitz & Bernoulli sur les logarithmes des nombres negatifs et imaginaires"], published in 1749 ...'
Bibliography: p.19
Numbers, Complex.
Numbers, Negative.
Logarithms.