Designed experiments, algebra and combinatorics

- In Section 10.4, the first two lines on 288 are incorrect. If Q and P are both association schemes on the same set with Q strictly finer than P, then P is a homomorphic image of Q according to the definition on page 287, but it is not a quotient of Q.
- In Section 10.5, Theorem 10.10 is not established. The proof on page 290 is mere wishful thinking. Can anyone prove this?

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