John D. Cook johndcook.com

RSA as a pairing

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Three-party Diffie-Hellman in one shot

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Elliptic curve pairings in cryptography

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Adding an imaginary unit to a finite field

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Four generalizations of the Pythagorean theorem

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The *m*th elementary symmetric polynomial of degree *n*

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Weighting an average to minimize variance

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Brownian motion and Riemann zeta

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Rolling correlation

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Analog of Heron’s formula on a sphere

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How much is a gigawatt?

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Japanese polygon theorem

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Tetrahedral analog of the Pythagorean theorem

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The anti-Smith chart

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Impedance and Trianglular Numbers

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Cross ratio

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Text case changes the size of QR codes

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An ancient generalization of the Pythagorean theorem

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An ancient generalization of the Pythagorean theorem

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Mentally estimating log base 2

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