I just got an email from one V. Ramayya saying:

> I am a mechanical and software engineer interested in applying Category Theory to Systems Biology as applied to Ovarian Cancer.

> When googling through the internet, I came across your webpage on Diagrams . Going through the material on this webpage, I did not see any reference to Professor Forrester's "System Dynamics".

> Since the life-cycle of Cancer is dynamic, may I know why "system dynamics" was not talked about on this page?

Of course the reason is that my abilities and knowledge are limited. But, I took this opportunity to remove everything from that Diagrams page on the nLab and put it here:

* [[Network theory]]

on the Azimuth Library.

I also added some material on Jay Forrester's work on system dynamics.

I also tried to organize this page a bit more.