A clever visualization of a Cauchy Product.

Each black square has value 1, each red square has value -1.

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# Month: January 2019

## Cauchy Product

## Smallest Prime Number Magic Square

## Fibonacci Spiral Jigsaw Puzzle

A clever visualization of a Cauchy Product.

Each black square has value 1, each red square has value -1.

American mathematician Harry L. Nelson won the challenge to produce a 3 × 3 magic square containing the smallest consecutive primes:

Each piece of this puzzle is similar (the same shape at a different size). The placement of the pieces is based on the golden angle (≈137.5º), and results in a pattern frequently found in nature (phyllotaxis), for instance on sunflowers. The puzzle features 8 spirals in one direction, and 13 in the other. You can build your own Fibonacci spiral puzzle by following John Edmark’s tutorial.