PDF files available

These pdf files are the most up-to-date version of the matter of this site. A pdf file of the complete site is quite large, so I have broken it up into four parts: All these documents are partly to be available to me when I get old (as if I weren’t already!), partly with the idea that if I can’t explain it (even if only to myself), I haven’t really understood it.

Other miscellaneous stuff, overview, some of it rather math-heavy:

And on quite another subject (why not?)