Here's the map in case you don't want to watch the entire 11 min video: https://...

Here's the map in case you don't want to watch the entire 11 min video:

https://www.flickr.com/photos/95869671@N08/32264483720/in/da...

I wonder if there are a set of features and distance metric that could describe each field well enough to do hierarchical cluster analysis -- maybe through scraping keywords from enough mathematics journals, etc?