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ON BAIRE CLASSIFICATION OF STRONGLY SEPARATELY CONTINUOUS FUNCTIONS

机译:关于严格连续函数的贝尔分类

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We investigate strongly separately continuous functions on a product of topological spaces and prove that if X is a countable product of real lines, then there exists a strongly separately continuous function f : X → R that is not Baire measurable. We show that if X is a product of normed spaces X_n, a ∈ X and σ(a) = {x ∈ X : |{n ∈ N : x_n ≠ a_n}| < N_0} is a subspace of X equipped with the Tychonoff topology, then for any open set G is contained in σ(a), there is a strongly separately continuous function f : σ(a) → R such that the discontinuity point set of f is equal to G.
机译:我们研究拓扑空间乘积上的强烈分开的连续函数,并证明如果X是实线的可数乘积,则存在一个不可分开的连续函数f:X→R,这是无法用Baire度量的。我们证明,如果X是范数空间X_n的乘积,则a∈X和σ(a)= {x∈X:| {n∈N:x_n≠a_n} | <N_0}是X的一个带有Tychonoff拓扑的子空间,然后对于σ(a)中包含的任何开放集G,都有一个强烈分开的连续函数f:σ(a)→R使得不连续点集为f等于G

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