Assuming that features on functional heads are variables (Borer, 2005), we expect to find
syntactic operations and functional elements that target and manipulate these variables beyond matching and valuation in agree. We argue that such syntactic operations and
functional elements exist. This paper presents such a functional element: a polarity
operator manipulating features of a functional head it modifies. The empirical motivation
or our proposal comes fromparallel systematic homophony over the same set of functional
interpretations and features within the nominal extended projection in Slavic and Arabic dialects.
keywords: syntactic features, nominal categories, Slavic, Arabic