An astonishing thesis in the philosophy of quantum gravity is that spacetime ”disappears” at the fundamental level of reality, and that the geometrical notions of ”length” and ”duration” are derived from the dynamics of the basic non–geometrical building blocks of the theory. Unveiling here the analysis of the concepts of spacetime, measure, and magnitude, given by the philosopher Nicolai Hartmann, I argue that the ”disappearance” thesis is too strong. The fundamental geometrical notions are, on the contrary, primitive and cannot be (...) derived from the fundamental building blocks; they must be presupposed ab initio not only for epistemological, but also for methodological reasons. (shrink)

A collection of essays dedicated to Pier Luigi Lecis' retirement. Contributors include: Mariano Bianca, Silvana Borutti, Vinicio Busacchi, Massimo Dell'Utri, Rosaria Egidi, Roberta Lanfredini, Giuseppe Lorini, Diego Marconi, Francesco Orilia, Paolo Parrini, Alberto Peruzzi, Simonluca Pinna, Pietro Salis, Paolo Spinicci.