Mendelson, Shahar2015-12-100025-5831http://hdl.handle.net/1885/39010Let F be a class of functions on a probability space (Ω, μ) and let X 1,...,X k be independent random variables distributed according to μ. We establish an upper bound that holds with high probability on {\rm sup}_{f \in F} |\{i : |f(X_i)| \geq t \for200810.1007/s00208-007-0152-92015-12-09