A10 is a subproject in area A "Register and grammar" of the DFG-funded Collaborative Research Center 1412 “Register”: Language Users’ Knowledge of Situational-Functional Variation.

In some cases, a logical expression can be signaled by one or more overt morphemes, apparently without a change in meaning.  This project investigates the hypothesis that optional morphological doubling is cross-linguistically correlated with a particular situational-functional property of discourse – namely, to what extent a unique Question Under Discussion is retrievable – and thus to register.