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The “Idea” section of the page currently states:
such that the constructors for A can refer to B and vice versa. In addition, the constructor for B can refer to the constructor for A.
which looks to me like it’s come from the Department of Redundancy Department. Okay to delete the “In addition …” sentence?
It’s not actually redundant, although I can see that it looks like it. The first sentence says that the constructors for A can refer to the type B, and that the constructors for B can refer to the type A. The second sentence says that moreover the constructors for B can refer to the constructors of the type A. There is probably a better way to word this, if you have any ideas.
(BTW, standard nForum conventions are to name the thread about a page with just the name of the page, and to include a link to the page in the post; instiki syntax [[inductive-inductive type]]
works here too. For other readers: inductive-inductive type.)
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