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Remark on the abstract Dirichlet problem for Baire-one functions

Kalenda O. F. K.

Bulletin of the Polish Academy of Sciences. Mathematics

2005

Vol. 53, no 1

55-73

We study the possibility of extending any bounded Baire-one function on the set of extreme points of a compact convex set to an affine Baire-one function and related questions. We give complete solutions to these questions within a class of Choquet simplices introduced by P. J. Stacey (1979). In particular we get an example of a Choquet simplex such that its set of extreme points is not Borel but any bounded Baire-one function on the set of extreme points can be extended to an affine Baire-one function. We also study the analogous questions for functions of higher Baire classes.