Bach–Peters sentence

In GRAMMATICAL theory, a SENTENCE containing two NOUN PHRASES, each of which contains a PRONOUN which is ANAPHORIC to the other noun phrase, as in [The pilot who shot at it _i ]_j hit [the plane that was chasing him _j ]_i ; also called the Bach–Peters paradox. Such sentences present a problem of infinite regress for certain theories of anaphora. The term is named after two US linguists: Emmon Bach (b. 1929) and Stanley Peters (b. 1941).