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en.wikipedia.org/wiki/Complex_number

A complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x 2 = −1. Because no real number satisfies this equation, i is called an imaginary number.

www.quora.com/Who-invented-imaginary-and-complex-numbers

It's actually difficult to say who actually was the first to come up with the idea of complex numbers or for that matter any mathematical findings because in mathematics there is no sort of 'inventions' since everything is believed to have existed in nature since the time of inception, just that with more advancement and evolution of human minds men were able to solve the mysteries out...

rossroessler.tripod.com

For school, I had to do a paper on the History of i (and the history of complex numbers in general).Finding this a tedious task, and scrolling through many useless sights, I wished that there were just one sight that had everything I needed on it.

www.math.uri.edu/~merino/spring06/mth562/ShortHistoryComplexNumbers2006.pdf

A Short History of Complex Numbers Orlando Merino University of Rhode Island January, 2006 Abstract This is a compilation of historical information from various sources, about the number i = √ −1. The information has been put together for students of Complex Analysis who

en.wikipedia.org/wiki/Number

The complex numbers consist of all numbers of the form + where a and b are real numbers. Because of this, complex numbers correspond to points on the complex plane, a vector space of two real dimensions. In the expression a + bi, the real number a is called the real part and b is called the imaginary part.

www.reference.com/math/invented-imaginary-numbers-c4bf1083953069d3

Who Invented Imaginary Numbers? Greek mathematician Heron of Alexandria is credited with having first conceived of imaginary numbers about the time of Christ, but it was Rafael Bombelli who first described the rules for the use of complex numbers in the late 16th century.

A complex number is a number with both real and imaginary numbers, such as (3+2i), where 3 is real and 2i is imaginary. ... but the imaginary numbers were first invented to solve equations with ...