Key Problems in Hadronic Interactions for Students

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Cliff Burgess's textbook 'The Standard Model: A Primer' has 9 problems in chapter 9, which discusses hadronic interactions.

All the problems in the chapter are undoubtedly helpful and ought to be solved, but which problems in the chapter would you say are the most important?

 

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The most important for what?

Not everyone has the book, describing the problems here would help.