Authors: Claudio Sacerdoti Coen, Stefano Zacchiroli Title: Efficient Type Based Parsing in Strict Languages Abstract: We present an efficient technique for parsing ambiguous mathematical formulae. Our technique can be applied when the output of parsing and semantic analysis is a calculus that can be extended with metavariables and exploits the refinement function. We compare the efficiency of an implementation based on the Calculus of (co)Inductive Constructions with the state of the art.