ABSTRACT
Preparation for Chapter 9
Prep Problem 9.1. Review reversibility and rederive the canonical form of ⇑ = ↑ + ↑ and of ↑* = ↑ + * from scratch. If you find yourself having to refer to Section 5.4, you can also try ⤊.
To the instructor: The game of hackenbush is ideal for covering integer atomic weights. Start with flower gardens from WW [BCG01, Ch. 7]. An advanced group of students will be unsatisfied without seeing proofs of atomic weights from WW [BCG01, Ch. 8].
It has long been an axiom of mine that the little things are infinitely the most important. Sir Arthur Conan Doyle in The Adventures of Sherlock Holmes: A Case of Identity