Yet another instance of graph theory before Euler's invention of the subject in 1736: plus.google.com/+JeffErickson/

(A few labeled graphs (with notes as vertices and intervals as edges), from the 1492 printing of Boethius's _De institutione musica_, posted by @jeffgerickson on Google+)

A Mastodon instance for maths people. The kind of people who make $\pi z^2 \times a$ jokes.

Use $ and $ for inline LaTeX, and $ and $ for display mode.