I-within-i condition

I-within-i condition is a well-formedness condition in the GB-framework:

(i) * [A ... B ...] where A and B bear the same index

This condition excludes cases such as: [hisi friend]i where his is co-referential with the containing phrase his friend. The i-within-i condition is relevant to the notion of accessibility. Also see governing category.

Link
Utrecht Lexicon of Linguistics