Mathematician Girolamo Cardano, in his 1545 book dealing with complex numbers, "Ars Magna," dismissed them as "subtle as they are useless." Even Leonhard Euler, one of the greatest mathematicians, ...

I'm a mathematician who studies analysis: an area of math that deals with complex numbers. Unlike the more ... you need only one equation to rule them all: Euler's 1740 formula.

Instead of memorizing several complicated trig formulas, you need only one equation to rule them all: Euler’s ... term “imaginary number” – and others have observed, complex numbers ...