This is the blog website for the Part C networks course at University of Oxford.
The out-edge on communities seems not to be working: https://www0.maths.ox.ac.uk/system/files/coursematerial/2015/3127/21/community-structure-intro.pdf
Thanks for pointing this out. I have now fixed it.I don't understand what happened, as the file was there (I confirmed it), but I too could not open the .pdf file. [The uploaded .pptx did work.] I uploaded it again and again the url didn't work for some reason I can't fathom, but I managed to find a kluge to get around to it.