I am learning geometric algebra, and it is incredible how much it helps me understand other branches of mathematics. I wish I had been exposed to it earlier.

Additionally I feel the same way about enumerative combinatorics.

What are some less popular mathematical subjects that you think should be more popular?

**Answer**

**Category theory and algebraic geometry**.

I spent a lot of time in undergrad studying things that were kinda nifty, but way too classical to be of any use/interest beyond “fun math”. When I got to grad school, **category theory** was assumed and made some of my courses much harder than they should’ve been.

In the words of Ravi Vakil, “**algebraic geometry** should be learned slowly over a number of years”. I currently *NEED* algebraic geometry, so I don’t have this number of years. I wish I would’ve started that a long time ago. Additionally, both of these topics would’ve helped me learn the things I was thinking about anyways, in particular *commutative algebra*.

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