Author： Puzarenko V.
Publisher： Springer Publishing Company
ISSN： 0002-5232
Source： Algebra and Logic, Vol.50, Iss.5, 2011-10, pp. : 418-438
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Abstract
We construct an example of an admissible set which is a fixed point for the Σ-jump operator. Also a number of basic properties of fixed points are presented.
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