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Generating Borel measurable mappings with continuous mappings

机译:使用连续映射生成Borel可测量映射

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摘要

We prove that the relative rank r(S(X): C(X)) of the semigroup of Borel mappings B(X) from X to X (with the composition of mappings as the semigroup operation) with respect to the semigroup of continuous functions C(X) from X to X is equal to (χ)_1 if X is an uncountable Polish space which either can be retracted to a Cantor subset of X, or contains an arc, or is homeomorphic to its Cartesian square X~2.
机译:我们证明了Borel映射B(X)的半群从X到X的相对等级r(S(X):C(X))相对于连续半群的相对等级(以映射的组成为半群运算)如果X是不可数的波兰空间,它可以缩回X的Cantor子集,包含弧或与笛卡尔方X〜2同胚,则从X到X的函数C(X)等于(χ)_1。 。

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