“Discussion of imaginary units (i) and complex solutions to the equation.”

“Discussion of non-real solutions to the cubic equation.”

“I think I would say particularly complex numbers. When I first learned about complex numbers, I found the subject so beautiful that now you see I'm contradicting myself here that I thought it must hav...”

“this all involves complex numbers quantum mechanics is absolutely bound up with complex numbers”

“A significant algebra connecting physical and mathematical ideas, particularly important for FFT in electrical engineering, and a feature Travis Oliphant sought in programming languages.”