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## Main Question or Discussion Point

When thinking of what's the philosophy behind the "magic" complex i, i*i=-1, this seems the connection between real world and imaginary world, but what this imaginary world stands for? why with its help, many functions get resolved? and we can use the Euler formula, which is the basic of many other formulas..

Who found i? how did he find it? what kind of problems he tried to solve lead to the discovering of i?

Who found i? how did he find it? what kind of problems he tried to solve lead to the discovering of i?