Stop winning the Internet, Randall Munroe.
(Click the pic to visit the source and see the hover text for another hint.)
(A short math refresher in the Comments.) ←a link I do not actually expect anyone to click.
Thursday, January 20, 2011
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A complex number is a number made up of a real number and an imaginary number. The real part you know about -- it's just a regular old number number, like 6 or 7.2 or -49.3 or whatever. The imaginary part is a number like that, multiplied by the square root of -1.
The complex conjugate (call it A') of a complex number A is a number that has the property such that when you multiply A times A', the imaginary part goes to 0. Since there is no imaginary part, the result of the multiplication is a real number.
More here.
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