Don’t have many suggestions yet since I only skimmed it quickly. The one I have: on the dissection of 1 + XL you should add the proof that L a \times L b indeed satisfies the same equation as the disection. It’s not at all clear at first and I’d argue that it’s certainly more non-trivial than the other steps of the derivation (which are after all just mechanical applications of the dissection rules).

]]>Reading my calculus textbook, wondering why it’s so hard to understand, and came across this wonderful article explaining the whole phenomenon with a clear analogy. ]]>