“…Also in the area of challenges faced by students as they encounter the requirements of formal mathematical reasoning upon entry in university studies, Zoé Mesnil and Viviane Durand-Guerrier zoom in on one particular topic, the notion of implication in the context of first order predicate calculus, and propose a balance between formal and less formal approaches. Their proposition stands on the shoulders of a confident, well-informed account of theoretical considerations which factor in syntax, semantics and pragmatics (Durand-Guerrier & Dawkins, 2020). We commend the way in which these theoretical considerations are put into direct pedagogical purpose: to identify and analyse students' difficulties (in one case, concerning statements containing the expression "two by two"; in another, proving the convergence of the sum of two convergent sequences).…”