出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The computation of the step scaling function for the finite size mass-gap in the O(N) sigma model
at large N is reviewed. Practically exact nonperturbative results become available for both finite
and vanishing lattice spacing. We use them as a testbed to investigate standard procedures of
continuum extrapolation in lattice field theory.
