I've tested the example myself, and the Metamath program verifies it without errors.
Given the explicit statement in the book, I lean toward considering this as a potential issue in metamath-exe rather than an erratum for the book. How does metamathknife handle this case? -- You received this message because you are subscribed to the Google Groups "Metamath" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/metamath/a0a5ed40-75bd-4413-af03-a472c37c369fn%40googlegroups.com.
