Geodesic
Additive Families of Low Borel Classes and Borel Measurable Selectors
Canadian mathematical bulletin, Tome 54 (2011) no. 1, pp. 180-192

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DOI

An important conjecture in the theory of Borel sets in non-separable metric spaces is whether any point-countable Borel-additive family in a complete metric space has a $\sigma $ -discrete refinement. We confirm the conjecture for point-countable $\Pi _{3}^{0}$ -additive families, thus generalizing results of R. W. Hansell and the first author. We apply this result to the existence of Borel measurable selectors for multivalued mappings of low Borel complexity, thus answering in the affirmative a particular version of a question of J. Kaniewski and R. Pol.
DOI : 10.4153/CMB-2010-088-8
Mots-clés : 54H05, 54E35, σ-discrete refinement, Borel-additive family, measurable selection 
Spurný, J.; Zelený, M. Additive Families of Low Borel Classes and Borel Measurable Selectors. Canadian mathematical bulletin, Tome 54 (2011) no. 1, pp. 180-192. doi: 10.4153/CMB-2010-088-8
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     author = {Spurn\'y, J. and Zelen\'y, M.},
     title = {Additive {Families} of {Low} {Borel} {Classes} and {Borel} {Measurable} {Selectors}},
     journal = {Canadian mathematical bulletin},
     pages = {180--192},
     year = {2011},
     volume = {54},
     number = {1},
     doi = {10.4153/CMB-2010-088-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2010-088-8/}
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