Imaginary numbers as we have discussed in Tuesday’s post are numbers of the form bi where is a real number and . The term imaginary as (opposed to real) was first used by Rene Descartes, the mathematician who invented Coordinate Geometry — the Cartesian plane in particular. Leonhard Euler was the one who introduced the symbol for .
Gerolamo Cardano, a pioneer in probability, was the one who suggested the use of numbers of the form where and are real numbers and . Numbers of this form were named complex numbers by Carl Frederich Gauss.The real part of is and the imaginary part is bi. » Read more