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Strong crossover

SYNTAX: one kind of crossover. Occurs in configurations in which a wh-element or quantificational NP undergoes A-bar movement across a pronominal which c-commands the extraction site, as in (i):

(i) *Whoi did hei see ti 
Who is moved across he in (i). The fact that he cannot be coindexed with ti (which would yield the reading: which x, x saw x), is referred to as 'strong crossover', because on the intended reading the structure is strongly ungrammatical. Since the wh-trace, being a variable, must be A-free, binding by he would constitute a Condition C violation. To be distinguished from weak crossover.
LIT. Chomsky, N. (1982)
Chomsky, N. (1981)
Chomsky, N. (1976)
Postal, P. (1971)
Wasow, T. (1972)