Computability in Europe 2008
Logic and Theory of Algorithms

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Regular Talk:
Cupping Classes of Sigma 2 Enumeration Degrees

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Speaker: Mariya Ivanova Soskova
Slot: Tue, 11:40-12:00, Room 24 (col. 3)

Abstract

We prove that no subclass of the Sigma 2 enumeration degrees
containing the 3-c.e. enumeration degrees can be cupped to 0'e by a
single Sigma 2 enumeration degree.

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