Ask HN: Math for hackers.

After the large number of posts I've seen asking about reading math, returning to study, wanting to know more about foundations, etc, I've decided to make some of my writings and masterclass material available on the web. There's a lot of it, and it needs work, so I'd appreciate some comments about what you'd like to see first.

I'm intending to create an undirected graph of topics, so you can start where you want, then go forward once you get the idea, or back if you're struggling. Then you can concentrate on the bits you're most interested in.

But what should I start with? I've read what people have advised others to read, and I'm looking for a start point.

Oddly enough, I will start with "Adding Fractions" and basic algebra (expanding, factoring and simplifying), but where then? I will eventually cover O(..) notation, basic calculus, infinities, series, convergence, combinatorics, graphs (vertices and edges) and more, but what do you want to see first?

It will also be on a wiki-like system so you can contribute later if you want, although not at first while I get it running.

Comments, thoughts, suggestions welcome.