Assuming you are reading it on a website, this is the place where I collect notes on Mathematics and Computer Science.
All notes can be accessed as a HTML webpage or as a PDF file.
Webpages have collapsible proofs, but of course that's not feasible in PDFs
Left as an exercise for the reader
You can switch between the ending slash and the file extension to access the webpage and PDF document. Note that the PDF version of this document is at .