About these notes

My notes are not set in stone. I revise them in place as I learn, rather than publishing a new version alongside.

Three stages

• First draft: an idea written down as is, incomplete, likely to change a lot.
• Work in progress: the structure is there, but I am still filling it in and correcting it.
• Settled note: the substance is stable. It may still be touched up, but not reworked.

Dates

The date shown in lists is the date of the last substantive revision. Fixing a typo does not change it.