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A complex number is the sum of a real number and an imaginary number, which can be plotted on an Argand Diagram, or complex plane, where the vertical axis is imaginary and the horizontal axis is real. Euler gave us the representation that $a+bi=re^{i\theta},$ the so-called polar representation of a complex number. Complex numbers often give a clean, clear, and elegant solution to problems that are otherwise muddy and convoluted. Examples, explanations and derivations to follow. Topics covered by this "meta topic" include: * Adding complex numbers * Multiplying complex numbers * Dividing complex numbers * Complex conjugate ---- CategoryMetaTopic