use the grammar of pregroups as the syntactic machinery to construct distributional meaning representations, since both pregroups and vector spaces can be seen as examples of the same abstract structure, which leads to a particularly clean mathematical description of the compositional process.
the approach applies more generally, for example to other forms of categorial grammar, such as Combinatory Categorial Grammar (Steedman, 2000;Maillard et al., 2014), and also to phrase-structure grammars in a way that a formal linguist would recognize (Baroni et al., 2014).