See the pdf branch or visit topos.site/poly-book.pdf for the latest build.
In the summer of 2021, we offered a course based on this book: visit https://topos.site/poly-course/ for more details.
Feel free to share feedback at https://docs.google.com/document/d/1qY5hLglgSW_p2AascL7XM3c4dByGZrECcnh6M1d3by8/edit.
