### What’s the Most Exciting New Mathematics?

#### Posted by John Baez

I’m considering writing a column on the most exciting new developments in math (for some magazine). This makes me want to ask:

What do *you* think are the most exciting new developments in math?

It would help a lot if you explain *why* you think they’re exciting. And I especially want to hear answers from *outside* category theory–since I roughly know what’s going on there. But there are probably new things there, too, that I haven’t heard about yet. So don’t hold back: let me know what you think!

## Re: What’s the Most Exciting New Mathematics?

How new is “new” for your purpose?