A Piece of the Pi: mathematics explained
Richard GreenFor the intelligent general reader who likes mathematics.
| Platform |  | Pricing | Freemium | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 124 | Subscribers | Read | apieceofthepi.substack.com |
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Latest Issues
Recent posts by this newsletter. Browse the email archive.
A polynomial with Rubik’s cube symmetry
Rubik’s Cube is a well-known combination puzzle that was invented by Ernő Rubik in 1974. What makes the cube interesting, both as a puzzle and as a mathematical object, is the enormous amount of symmetry it has. The puzzle can be permuted i...
Repunits and prime numbers
A repunit (“repeated unit”) is a number that only contains the digit 1 in some number base. For example, 31 is a repunit in base 5 and base 2, because 31 is written as 111 (25+5+1) in base 5, and as 11111 (16+8+4+2+1) in base 2. Another num...
The Parks puzzle
The Parks puzzle is a Sudoku-like game that is played on a square grid containing different coloured regions known as parks. The objective is to place trees on some of the squares in such a way that each column contains c trees, each row co...
Hexagonal knot mosaics
A hexagonal knot mosaic is a way to draw a knot on a hexagonal board. A hexagonal r-mosaic is a hexagonal board of radius r that is centred around a given hexagon, and a knot is a closed loop of string in three dimensional space. The pictur...
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Authors
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I am a professor of mathematics at the University of Colorado Boulder, interested mainly in algebra and combinatorics.
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