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Young measures. (English) Zbl 0738.28004
Methods of nonconvex analysis, Lect. 1st Sess. CIME, Varenna/Italy 1989, Lect. Notes Math. 1446, 152-188 (1990).
[For the entire collection see Zbl 0705.00022.]
This paper is a survey on Young measures. The main idea is that Young measures generalize functions and are particularly useful to study the limit behaviour of a sequence of oscillating functions. Under very mild assumptions any sequence of functions has a subsequence which converges to some Young measure.
The titles of the six sections are: First level theory: examples; Second level theory: the measurable locally compact case; General theory: the case of a metrizable Souslin space. Tightness; Application to sequences of measurable functions; Applications to uniformly integrable sequences in $$L^ 1$$; Some properties of bounded sequences in $$L^ 1$$. Connection with the biting lemma. An appendix contains some basic results of measure theory.

##### MSC:
 28A20 Measurable and nonmeasurable functions, sequences of measurable functions, modes of convergence 28A33 Spaces of measures, convergence of measures 49Q20 Variational problems in a geometric measure-theoretic setting 46E27 Spaces of measures 28-02 Research exposition (monographs, survey articles) pertaining to measure and integration 49-02 Research exposition (monographs, survey articles) pertaining to calculus of variations and optimal control