Life has become quite busy now that I'm back in California, but in a fun way so far. I have some talks to think about:

1. On Wednesday October 24 I'm giving the colloquium at 3:30 at the mathematics department of the University of Southern California. I will probably talk about The Mathematics of Planet Earth, to help me prepare the slides for a bigger talk coming up shortly.

1. On October 30th I'm giving a public lecture on [The Mathematics of Planet Earth]( at Stellenbosch University in South Africa, as part of the 50th annual meeting of the South African Mathematical Society. I'll do it remotely, via videoconferencing, so there will be technical issues to sort out. I'm going to test out some things with my host, Bruce Bartlett, this Monday at the awful hour of 9:30 am. That's when the talk will be, too!

1. On Friday November 16 I'm giving the Lang Lecture, an annual lecture at at the math department of U. C. Berkeley. I don't know what I'll talk about yet - either fun math or The Mathematics of Planet Earth.

1. On December 6 I'll be giving a talk on The Azimuth Project: an Open-Access Educational Resource at Climate Modeling in an Open, Transparent World, organized by Steve M. Easterbrook, V. Balaji et al as part of the AGU (American Geophysical Union) Fall Meeting in San Francisco. Yes, our application got accepted! This talk is at 9:00 am, and it's for just 15 minutes. It wouldn't be worth bothering with except that I'll meet a bunch of climate scientists.

I also have some classes to teach:

1. This quarter I'm teaching an undergraduate course on ordinary differential equations. I want to use some examples from population biology - indeed I've already started. And I want to get the students to solve some first-order ODE using the simplest possible numerical method, the Euler method. I would like them to do this using online software that runs on a browser! I know such software is already out there, but I have to find it. Can you help me? I think the Sage website Staffan likes is an option. I believe there are also webpages that do nothing but solve first-order ODE. The math department also has Mathematica on its computers, but there are 90 students in this class, so they'll overwhelm the facilities if we proceed that way. I'll post about this on the blog later.

1. I'm also teaching a graduate seminar, Mathematics of the Environment. This meets on Tuesdays from 3:30 to 5 and hasn't met yet. I'll start either with my Energy, the Environment, and What Mathematicians Can Do talk or a warmup version of my 'Mathematics of Planet Earth' talk, which will be more optimistic in tone. Not sure I'll have time to make slides for that by Tuesday, though!

1. Next quarter I'll be teaching an upper-level undergraduate course on game theory, where I can do whatever I want - as long as it's game theory. So, I'll probably talk about 2-person games, Nash equilibria, and then evolutionary game theory - as I began to do in the information geometry series. This would be a fun excuse to talk about game theory, evolution and information theory in a low-tech, no-frills way. It would be fun to blog about this. But....

1. Next quarter I'll also be teaching a graduate course on classical mechanics, using my book with Derek Wise. Ideally I would use this time to
refine that book and get it ready for publication, but it looks like I'll be quite busy, since...

1. Next quarter I'll also be continuing my seminar Mathematics of the Environment. Since it's quite hard
to prepare interesting classes on 3 new subjects, I'll probably slack off at this point and teach this from my book with Jacob, A Course on Quantum Techniques for Stochastic Physics, following it fairly closely so I don't have to prepare too much. This will at least help me think about how I want to refine that book.

Then there are blog articles:

1. I posted [Azimuth News (Part 2)](, to make people aware that a lot of stuff is going on here. I got about 3 or 4 people applying for membership in the Forum thanks to this.

1. On Monday I want to post the article by [[David Tanzer]], [[Blog - Petri net programming (part 1)]].

1. Then I want to post the article by [Matteo Smerlak](, [[Blog - the mathematical origin of irreversibility]]. This is almost polished up, but there's so much material that could stand longer explanations! I'd like to do all the calculations that prove all the results here...

1. I need to edit and post [[Tim van Beek]]'s article [[Blog - fluid flows and infinite dimensional manifolds (part 4)]]. This has been sitting in my to-do list for a long time - sorry, Tim.

1. I need to post more articles about online models that people have created here!

1. I want to blog about the [selected papers network]( being developed by Chris Lee and Marc Harper. They are still writing the software for that.

Finally, papers not related to Azimuth:

1. My paper [G2 and the rolling ball]( seems to have been accepted by _Transactions of the American Mathematical Society_, modulo some small corrections. I uploaded a corrected version today.

1. I need to finish the paper [The beauty of roots](, written with Dan Christensen and Sam Derbyshire.