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 ..... In the beginning of the 19th century, other mathematicians discovered independently the geometrical representation of the complex numbers: ...

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

A Short History of Complex Numbers ... notes track the development of complex numbers in history, and give evidence .... but I searched until I found the proof.”.

http://rossroessler.tripod.com/

Complex numbers help us study the flow of fluid around objects, such as ... 3rd and 4th degree polynomial equations were discovered, and people realized that  ...

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

The complex numbers come last, if at all. ... to many more artificial than real, and I held the same opinion myself, until I found the geometrical demonstration .

https://www.quora.com/Who-discovered-imaginary-numbers

The first use or effort of using imaginary number dates back to AD. Heron of Alexandria , while studying the volume of an impossible ...

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

Numbers, Complex The set of complex numbers includes all the numbers we ... P . This distance can be found by dropping a perpendicular line segment from P ...

https://math.stackexchange.com/questions/534474/discovery-of-complex-numbers

Now by comparing the real and imaginary part we get two equations for two ... the cubic root of z is a complex number with unknown real part a ...

https://www.purplemath.com/modules/complex.htm

Introduces the imaginary number 'i', and demonstrates how to simplify ... This new number was invented (discovered?) around the time of the Reformation.

https://betterexplained.com/articles/a-visual-intuitive-guide-to-imaginary-numbers/

Seeing complex numbers as an upgrade to our number system, just like zero, .... Even Euler, the genius who discovered e and much more, didn't understand ...