Let (X,Σ,μ)(X,\Sigma, \mu)(X,Σ,μ) and (Y,T,ν)(Y, T, \nu)(Y,T,ν) be measure spaces. A function f:X→Yf:X\to Yf:X→Y is Lusin or Luzin if the image of every set of μ\muμ-measure zero has zero ν\nuν-measure.
Wikidata ID: Q1361393