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https://doi.org/10.1007/s11006-005-0031-1
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Cite Journal: Mathematical Notes |  Publication Date: Mar 1, 2005 |
The familiar theorem that any Σ 2 1 (a)-set X of real numbers (where a is a fixed real parameter) not containing a perfect kernel necessarily satisfies the condition X\( \subseteq \)L[a] is extended to a wider class of sets, with countable ordinals allowed as additional parameters in Σ 2 1 (a)-definitions.
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