A Piece of the Pi: mathematics explained
Richard GreenFor the intelligent general reader who likes mathematics.
| Platform |  | Pricing | Freemium | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 163 | Founded | 3 years ago | Last Issue | 2 months ago |
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The 1-2-3 conjecture for graphs
The Petersen graph is a famous graph with 10 vertices and 15 edges.
The Petersen graph is a famous graph with 10 vertices and 15 edges. In the picture below, each edge of the graph has been labelled by a (blue) number from the set {1, 2, 3...
Tournaments and dice games
The picture above shows a set of seven dice designed by Oskar van Deventer. An arrow between die x and die y indicates that if the dice x and y are thrown randomly, then die x will show a higher number than die y with a probability of 5/9....
“Lights Out” on a triangular grid
Lights Out is a game that can be played on an equilateral triangular grid of buttons, each of which may be in a lit or unlit state.
Lights Out is a game that can be played on an equilateral triangular grid of buttons, each of which may be...
How to turn a number into a rooted forest
The Matula arborification of a number is a way to represent that number as a rooted forest. The picture above shows the arborifications of the numbers 41 up to 49. The connected components of a rooted forest are known as rooted trees. Each...
Surfaces and sequence graphs
The golden ratio, φ=(1+√5)/2, is a famous example of an irrational number, which means that it cannot be expressed exactly as a ratio of two integers.
The golden ratio, φ=(1+√5)/2, is a famous example of an irrational number, which means t...
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Authors
The writers behind this newsletter.
I am a freelance mathematics writer, and a professor of mathematics at the University of Colorado Boulder. I am mainly interested mainly in algebra and combinatorics.
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