https://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 x2 = −1. Because no ...

https://en.wikipedia.org/wiki/Imaginary_number

An imaginary number is a complex number that can be written as a real number multiplied by the imaginary unit i, which is defined by its property i2 = −1.

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

are curious about the origins of the subject, since most books on Complex Variables ... notes track the development of complex numbers in history, and give  ...

http://rossroessler.tripod.com/

For a very long time, no one tried to manipulate imaginary numbers. Although, it wasn't for a lack of trying. Once negative numbers were “invented”, ...

https://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 ...

https://www.math.toronto.edu/mathnet/questionCorner/complexorigin.html

Oct 29, 1996 ... Complex numbers were being used by mathematicians long before they were first properly defined, so it's difficult to trace the exact origin.

https://www.encyclopedia.com/science-and-technology/mathematics/mathematics/complex-numbers

plus many more numbers that are generally not encountered until the study of higher mathematics. Complex numbers were invented centuries ago in order to ...

https://www.cut-the-knot.org/arithmetic/algebra/HistoricalRemarks.shtml

Remarks on the History of Complex Numbers. The study of numbers comes usually in succession. Children start with the counting numbers. Move to the ...

https://medium.com/i-math/imaginary-numbers-explained-e5aa63bdb7ae

Jul 26, 2017 ... We were talking about number systems when I mentioned the imaginary numbers and she burst into laughter. “What's so funny?” “Imaginary ...

https://medium.com/starts-with-a-bang/top-5-facts-about-imaginary-math-737e4b53b57d

Feb 26, 2014 ... You know that the square root of -1 is “i”, an imaginary number. ... until we defined them, and invented the imaginary numbers to do exactly that!