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The Power of Complex Numbers
Cardano wrote a book called Arzmagna which is like a great art of algebra and he was writing solutions for the cubic and cortical equations. In the process of solving these equations he came up with square root of an negative number specifically square root of minus 17. It took another two or three hundred years for mathematicians to figure that out but initially it looked like a completely crazy idea you know so all in all, complex numbers are not mysterious at all.