 They are named after Laurence Chisholm Young who invented them, however, in terms of linear functionals already in 1937 still before the measure theory has been developed.We let formula_1 be a bounded sequence in formula_2, where formula_3 denotes an open bounded subset of formula_4.Then there exists a subsequence formula_5 and for almost every formula_6 a Borel probability measure formula_7 on formula_8 such that for each formula_9 we have formula_10 in formula_11.