Polynomial Rings
Every code listing from this chapter of Applied Post-Quantum Cryptography — 3 in total, 3 runnable here. Edit any cell and press Run.
The book's snippets build on each other down the chapter, but a Sage Cell
kernel runs one cell and keeps no state afterwards, so each cell replays the
earlier listings with apqc_book. That call is the only thing added
to the book's own code.