![]() ![]() ![]() Cauchy, a French contemporary of Gauss, extended the concept of complex numbers to the notion of complex functions. (1777-1855) who introduced the term complex number. Suggested to drop the unit vector 1 in presenting vectors on the plane. Vertical positive direction, respectively, were introduced by Leonhard Euler (1707-1783) who visualized complex numbersĪs points with rectangular coordinates, but did not give a satisfactory foundation for complex numbers theory. The notations 1 and i for unit vectors in horizontal positive direction and Numbers were developed by the Italian mathematician Rafael Bombelli (baptized on 20 January 1526 died 1572). The rules for addition, subtraction, multiplication, and division of complex Complex numbers were introduced by the Italian famous gambler and mathematician Gerolamo Cardano (1501-1576) inġ545 while he found the explicit formula for all three roots of a cube equation. ![]()
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