What is Bretschneider's formula??

An example of classic Japanese geometry -- Sangaku

an irrational sum.

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How Imaginary Numbers Were Invented

What is the i really doing in Schrödinger's equation?

Kepler’s Impossible Equation

a complex approach to a classic sum

a heroic use of the complex numbers

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Heron’s formula: What is the hidden meaning of 1 + 2 + 3 = 1 x 2 x 3 ?

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Factoring Quadratics WITHOUT Guessing Product & Sum

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Imaginary numbers aren't imaginary

Square-root of a matrix

Finding Even Larger Numbers

a nice functional equation.