2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/97835We generalise a result of Sawyer to show the following: For each y\in R^p and w\in R^q let Γ(y,w) be a measurable d-dimensional surface in R^n. Under conditions on the number of parameters and smoothness assumptions, there exists a set of measure zero that includes a Γ(y,w) for every y.7 pages. To appear in MathematikaClassical Analysis and ODEs28A75text