a1 Mathematical Institute, University of Wroclaw, 50–384 Wrocław, Poland
We discuss in the paper the following problem: Given a function in a given Baire class, into “how many” (in terms of cardinal numbers) functions of lower classes can it be decomposed? The decomposition is understood here in the sense of the set-theoretical union.
(Received April 30 1990)
(Revised December 19 1990)
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c1 Department of Mathematics, University of California, Davis, California 95616-8633.