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Tree-adjoining grammar
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===Equivalences=== Vijay-Shanker and Weir (1994)<ref name="vijayshankarAndWeir1995">Vijay-Shanker, K. and Weir, David J. 1994. ''The Equivalence of Four Extensions of Context-Free Grammars''. Mathematical Systems Theory 27(6): 511β546.</ref> demonstrate that [[Indexed grammar#Linear indexed grammars|linear indexed grammars]], [[combinatory categorial grammar]], tree-adjoining grammars, and [[head grammar]]s are [[Weak equivalence (formal languages)|weakly equivalent]] formalisms, in that they all define the same string languages.
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