TY - JOUR
T1 - Category analogue of sup-measurability problem
AU - Ciesielski, K.
AU - Shelah, S.
PY - 2000/12
Y1 - 2000/12
N2 - A function F : ℝ2 → ℝ is called sup-measurable if Ff : ℝ → ℝ given by Ff (x) = F(x, f(x)), x ∈ ℝ, is measurable for each measurable function f : ℝ → ℝ. It is known that under different set theoretical assumptions, including CH, there are sup-measurable non-measurable functions, as well as their category analogues. In this paper we will show that the existence of the category analogues of supmeasurable non-measurable functions is independent of ZFC. A similar result for the original measurable case is the subject of a work in prepartion by Ros lanowski and Shelah.
AB - A function F : ℝ2 → ℝ is called sup-measurable if Ff : ℝ → ℝ given by Ff (x) = F(x, f(x)), x ∈ ℝ, is measurable for each measurable function f : ℝ → ℝ. It is known that under different set theoretical assumptions, including CH, there are sup-measurable non-measurable functions, as well as their category analogues. In this paper we will show that the existence of the category analogues of supmeasurable non-measurable functions is independent of ZFC. A similar result for the original measurable case is the subject of a work in prepartion by Ros lanowski and Shelah.
KW - Baire property
KW - Composition of functions
KW - Sup-measurable functions
UR - http://www.scopus.com/inward/record.url?scp=0345709486&partnerID=8YFLogxK
U2 - 10.1515/JAA.2000.159
DO - 10.1515/JAA.2000.159
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AN - SCOPUS:0345709486
SN - 1425-6908
VL - 6
SP - 159
EP - 172
JO - Journal of Applied Analysis
JF - Journal of Applied Analysis
IS - 2
ER -